Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: System Description

SYSTEM DESCRIPTION

INPUT AND OUTPUT SIGNALS OF COMBINATION METER ASSEMBLY

(a) Meter or Gauge

Item

Condition

Input/Output

Communication line

Signal

Component

Speedometer

Gauge

Input

CAN

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

-

Output

CAN

Vehicle speed signal (meter to other)

Related ECUs

Speed tolerance A signal

Speed tolerance B signal

Tachometer

Gauge

Input

CAN

Engine RPM data signal

ECM

Fuel receiver gauge

Gauge

Input

CAN

Fuel consumption signal

ECM

Starter signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Direct line

Fuel level signal

Fuel sender gauge assembly

-

Output

CAN

Fuel gauge indication signal

Related ECUs

Fuel level in main tank signal

ECM

Fuel sender voltage signal

Fuel direct data signal

DCM (Telematics transceiver)*

Fuel initial signal

Fuel average signal

Engine coolant temperature receiver gauge

Gauge

Input

CAN

Engine coolant temperature signal

ECM

  • *: w/ Manual (SOS) Switch

(b) Warning or Indicator

Item

Condition

Input/Output

Communication line

Signal

Component

Master warning light

Comes on/Blinks

-

-

-

-

Brake warning light / red (malfunction)

Comes on

Input

CAN

Brake warning light control flag signal

Skid control ECU (Brake actuator assembly)

Direct line

Brake reservoir level warning switch signal

Brake fluid level warning switch (Brake master cylinder reservoir assembly)

Vacuum warning switch signal

Vacuum warning switch assembly

Driver or front passenger seat belt warning light

Comes on/Blinks

Input

CAN

Driver seat belt buckle switch signal

Main body ECU (Multiplex network body ECU)

Parking brake switch signal

Shift selection P signal

ECM

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Front passenger seat belt buckle switch detection status signal

Airbag ECU assembly

Front passenger seat occupant detection status signal

Rear seat belt warning light

-

Input

CAN

Rear right door courtesy switch signal

Main body ECU (Multiplex network body ECU)

Rear left door courtesy switch signal

Parking brake switch signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Direct line

Rear left seat belt buckle switch signal

Rear seat inner belt assembly LH

Rear center seat belt buckle switch signal

Rear right seat belt buckle switch signal

Rear seat inner with center belt assembly RH

Comes on/Blinks

Output

Direct line

Rear right seat belt warning output signal

Rear seat belt warning light (Radio and display receiver assembly)

Rear center seat belt warning output signal

Rear left seat belt warning output signal

SRS warning light

Comes on

Input

CAN

Airbag warning light control request signal

Airbag ECU assembly

Test mode signal

ECM

EPS warning light

Comes on/Blinks

Input

CAN

EPS warning light request signal

Power steering ECU (Rack and pinion power steering gear assembly)

Parking brake indicator light

Comes on/Blinks

Input

CAN

Parking brake light control signal

Skid control ECU (Brake actuator assembly)

MIL (Check engine warning light)

Comes on/Blinks

Input

CAN

MIL request signal

ECM

PCS warning light

Comes on/Blinks

Input

CAN

PCS indicator display signal

Driving support ECU assembly

Slip indicator light

Comes on/Blinks

Input

CAN

Slip indicator light signal

Skid control ECU (Brake actuator assembly)

VSC OFF indicator light

Comes on

Input

CAN

VSC OFF light signal

Skid control ECU (Brake actuator assembly)

ABS warning light

Comes on/Blinks

Input

CAN

ABS warning light control signal

Skid control ECU (Brake actuator assembly)

Brake warning light / yellow (minor malfunction)

Comes on

Input

CAN

EPB warning light control signal

Skid control ECU (Brake actuator assembly)

Tire pressure warning light

Comes on/Blinks

Input

CAN

TPMS warning indicator condition 1 signal

Main body ECU (Multiplex network body ECU)

Brake hold operated indicator light

Comes on/Blinks

Input

CAN

Brake hold indicator signal

Skid control ECU (Brake actuator assembly)

Fuel level warning light

Comes on

Input

CAN

Fuel level signal

Fuel sender gauge assembly

ICS OFF indicator light*1

Comes on/Blinks

Input

CAN

ICS OFF light request signal

Clearance warning ECU assembly

High beam indicator light

Comes on

Input

CAN

High beam headlight request signal

Main body ECU (Multiplex network body ECU)

Tail indicator light*2

Comes on

Input

CAN

Taillight request signal

Main body ECU (Multiplex network body ECU)

Head indicator light*3

Comes on

Input

CAN

Low beam headlight request signal

Main body ECU (Multiplex network body ECU)

Turn indicator light

Blinks

Input

CAN

Hazard light blinking flag signal

Skid control ECU (Brake actuator assembly)

Hazard light activation request signal

DCM (Telematics transceiver)*4

Flasher request signal

Main body ECU (Multiplex network body ECU)

Airbag hazard light control request signal

Airbag ECU assembly

Left turn light signal lever position

Steering sensor

Right turn light signal lever position

Left cornering light signal lever position

Right cornering light signal lever position

Direct line

Hazard warning switch signal

Hazard warning switch assembly (Radio and display receiver assembly)

-

Output

CAN

Turn light state signal

Related ECUs

Hazard switch state signal

Direct line

LH turn signal switch signal

Each turn signal light

RH turn signal switch signal

Brake hold standby indicator light

Comes on

Input

CAN

Brake hold standby indicator signal

Skid control ECU (Brake actuator assembly)

  • *1: w/ Intelligent Clearance Sonar System
  • *2: w/ Tail Indicator Light
  • *3: w/ Head Indicator Light
  • *4: w/ Manual (SOS) Switch

(c) Multi-information Display

Item

Condition

Input/Output

Communication line

Signal

Component

Opening

Displayed

-

-

-

-

Ending

Displayed

Input

CAN

Driver seat courtesy switch signal

Main body ECU (Multiplex network body ECU)

Parked condition signal

Odometer

Displayed

Input

CAN

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

-

Output

CAN

Odometer unit signal

Related ECUs

Odometer signal

TRIP A / TRIP B meter

Displayed

Input

CAN

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Direct line

ODO/TRIP change switch signal

ODO/TRIP switch (Trip switch)

-

Output

CAN

TRIP A signal

Related ECUs

TRIP B signal

Driving information tab

Displayed

-

-

-

-

Digital speedometer

Displayed

Input

CAN

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

-

Output

CAN

Vehicle speed signal (meter to other)

Related ECUs

Speed tolerance A signal

Speed tolerance B signal

Distance (After start)

Displayed

Input

CAN

Engine RPM data signal

ECM

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

-

Output

CAN

Drive monitor unit 2 signal

Radio and display receiver assembly

Drive monitor display signal (After starting driving distance)

Distance (After reset)

Displayed

Input

CAN

Engine RPM data signal

ECM

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Driving range

Displayed

Input

CAN

Engine RPM data signal

ECM

Engine type information 1 signal

Engine type information 2 signal

Engine type information 3 signal

Engine type information 4 signal

Fuel consumption signal

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Direct line

Fuel level signal

Fuel sender gauge assembly

Average fuel consumption (After reset)

Displayed

Input

CAN

Engine RPM data signal

ECM

Fuel consumption signal

Total average fuel consumption reset request signal

Radio and display receiver assembly

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Direct line

Reset signal

Steering pad switch assembly

Average fuel consumption (After start)

Displayed

Input

CAN

Engine RPM data signal

ECM

Fuel consumption signal

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Average fuel consumption (After refuel)

Displayed

Input

CAN

Engine RPM data signal

ECM

Fuel consumption signal

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Current fuel consumption

Displayed

Input

CAN

Engine RPM data signal

ECM

Fuel consumption signal

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

-

Output

CAN

Drive monitor unit 0 signal

Radio and display receiver assembly

Drive monitor display signal (Current fuel consumption)

Average speed (After reset)

Displayed

Input

CAN

Engine RPM data signal

ECM

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

Direct line

Reset signal

Steering pad switch assembly

Average speed (After start)

Displayed

Input

CAN

Engine RPM data signal

ECM

Vehicle speed pulse integrated value signal

Skid control ECU (Brake actuator assembly)

Vehicle speed (SP1) signal

-

Output

CAN

Drive monitor unit 1 signal

Radio and display receiver assembly

Drive monitor display signal (After starting average speed)

Elapsed time (After reset)

Displayed

Input

CAN

Engine RPM data signal

ECM

Direct line

Reset signal

Steering pad switch assembly

Elapsed time (After start)

Displayed

Input

CAN

Engine RPM data signal

ECM

-

Output

CAN

Drive monitor display signal (After starting driving time)

Radio and display receiver assembly

Eco driving indicator zone

Displayed

Input

CAN

Eco-zone indicator level signal

ECM

Driving assist system information tab

Displayed

Input

CAN

LDW existence flag signal

Forward recognition camera

ACC ASL display ID2 signal

ECM

Local bus

Navigation signal

Radio and display receiver assembly*1

Navigation system-linked (image display)*1

Displayed

Input

Local bus

Navigation system-linked signal

Radio and display receiver assembly

Dynamic radar cruise control system information (image display)

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Control vehicle speed unit signal

Control vehicle speed signal

Lane departure alert system information (image display)

Displayed

Input

CAN

White line symbol left side signal

Forward recognition camera

White line symbol right side signal

Steering wheel symbol signal

Audio tab

Displayed

Input

Local bus

Audio signal

Radio and display receiver assembly

Audio system-linked (image display)

Displayed

Input

Local bus

Audio system-linked signal

Radio and display receiver assembly

Vehicle information tab

Displayed

Input

CAN

TPMS variation signal

Main body ECU (Multiplex network body ECU)

PCS existence flag signal

Driving support ECU assembly

Clearance sonar frame signal

Clearance warning ECU assembly*4

Blind spot monitor frame signal

Blind spot monitor sensor RH

Tire inflation pressure

Displayed

Input

CAN

TPMS FL (ID1) tire pressure information signal

Main body ECU (Multiplex network body ECU)

TPMS FR (ID2) tire pressure information signal

TPMS RL (ID3) tire pressure information signal

TPMS RR (ID4) tire pressure information signal

TPMS FL (ID1) tire indicator information 0 signal

TPMS FR (ID2) tire indicator information 0 signal

TPMS RL (ID3) tire indicator information 0 signal

TPMS RR (ID4) tire indicator information 0 signal

TPMS indicate number information 0 signal

TPMS unit information 0 signal

TPMS display request bit 0 signal

TPMS variation signal

Setting tab

Displayed

-

-

-

-

Warning message tab

Displayed

-

-

-

-

Automatic high beam indicator light

Displayed

Input

CAN

Smart beam indicator signal

Main body ECU (Multiplex network body ECU)

Lane departure alert indicator light

Displayed

Input

CAN

Indicator display signal

Forward recognition camera

Fault condition text display signal

Temporary unusable condition text display signal

Front camera vision blocked signal

Steering assist unusable text display signal

Cruise control indicator light (Constant speed control mode)

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Cruise control indicator light (Vehicle-to-vehicle distance control mode)

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

SPORT MODE indicator light*2

Displayed

Input

CAN

Drive mode select signal

ECM

SPORT S MODE indicator light*3

Displayed

Input

CAN

Drive mode select signal

ECM

SPORT S+ MODE indicator light*3

Displayed

Input

CAN

Drive mode select signal

ECM

AVS (TEMS) light signal

Absorber control ECU

ECO MODE indicator light

Displayed

Input

CAN

Drive mode select signal

ECM

Eco driving indicator light

Displayed

Input

CAN

Ecology light indicator signal

ECM

Cruise SET indicator light

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Clearance sonar indicator light*4

Displayed

Input

CAN

Clearance sonar switch indicator signal

Clearance warning ECU assembly

RCTA indicator light

Displayed

Input

CAN

Rear crossing traffic alert switch signal

Blind spot monitor sensor RH

BSM indicator light

Displayed

Input

CAN

BSD main switch signal

Blind spot monitor sensor RH

Icy warning light

Displayed

Input

CAN

Ambient temperature display signal

Air conditioning amplifier assembly

Switch signal of 0 or 0.5 below decimal point of ambient temperature display

CUSTOM MODE indicator light*3

Displayed

Input

CAN

Drive mode select signal

ECM

Outside temperature

Displayed

Input

CAN

Ambient temperature display signal

Air conditioning amplifier assembly

Switch signal of 0 or 0.5 below decimal point of ambient temperature display

Phone

Displayed

Input

Local bus

Phone signal

Radio and display receiver assembly

Voice recognition

Displayed

Input

Local bus

Voice recognition signal

Radio and display receiver assembly

Audio system operation status (image display)

Displayed

Input

Local bus

Audio system information status signal

Radio and display receiver assembly

Shift position

Displayed

Input

CAN

Shift position P signal

ECM

Shift position R signal

Shift position N signal

Shift position D signal

Shift gear signal

Mode indicator signal

Sports mode enable signal

Transmission oil temperature range signal

Suggestion function

Displayed

Input

CAN

Proposal service request 1 signal

Main body ECU (Multiplex network body ECU)

Proposal service request 2 signal

Proposal service request 3 signal

Power window inoperative advice signal

Direct line

Steering pad switch signal

Steering pad switch assembly

-

Output

CAN

Proposal service response 1 signal

Main body ECU (Multiplex network body ECU)

Proposal service response 2 signal

Proposal service response 3 signal

Meter illumination

Illumination level

Input

CAN

Auto dimmer signal

Main body ECU (Multiplex network body ECU)

Taillight request signal

Direct line

Illumination level signal

Light control rheostat switch (Trip switch)

-

Output

CAN

Rheostat duty signal

Certification ECU (Smart key ECU assembly)

Lounge illumination off signal

Main body ECU (Multiplex network body ECU)

Tail cancel signal

Direct line

Illumination level output signal

Related ECUs

EPB Shift Interlock Function Activated

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

EPB Shift Interlock Function Deactivated

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

CDY-2

Displayed

Input

CAN

CDY mode signal

ECM

ADJUSTING FORWARD CAMERA

Displayed

Input

CAN

Camera adjustment mode text signal

Forward recognition camera

ADJUSTING FRONT RADAR BEAM

Displayed

Input

CAN

Inspection mode for ACC signal

Driving support ECU assembly

ERROR ADJUSTING FRONT RADAR BEAM

Displayed

Input

CAN

FRD adjustment signal

Driving support ECU assembly

ADJUSTING FRONT RADAR BEAM VERTICAL

Displayed

Input

CAN

FRD adjustment signal

Driving support ECU assembly

ADJUSTING FRONT RADAR BEAM HORIZONTAL

Displayed

Input

CAN

FRD adjustment signal

Driving support ECU assembly

CHECKING PRE-CRASH BRAKE

Displayed

Input

CAN

Inspection mode signal

Driving support ECU assembly

CHECKING CRUISE CONTROL BRAKE

Displayed

Input

CAN

Inspection mode for ACC signal

Driving support ECU assembly

WRITE ZERO-POINT OF STEERING ANGLE*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

MAXIMUM RUDDER ANGLE MEMORY*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

END OF ADJUSTMENT*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

MEMORY ERROR*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Headlight Auto Leveling System Unavailable Visit Your Dealer

Displayed

Input

CAN

Display request lighting ECU status signal

Headlight ECU sub-assembly LH

Brake!

Displayed

Input

CAN

PCS warning message signal

Driving support ECU assembly

ICS multi-information signal

Clearance warning ECU assembly*4

Push and Hold Engine Switch for Emergency Stop

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Shift to N and Push ENGINE Switch to Restart

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Engine Stopped Shift into P

Displayed

Input

CAN

Engine stall message signal

ECM

Engine Stopped Stop in a Safe Place

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Low Braking Power Stop in a Safe Place See Owner's Manual

Displayed

Input

CAN

Brake warning light control flag signal

Skid control ECU (Brake actuator assembly)

Direct line

Brake fluid level warning switch signal

Brake fluid level warning switch (Brake master cylinder reservoir assembly)

Vacuum warning switch signal

Vacuum warning switch assembly

Switch to Brake*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Brake*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Object Detected Acceleration Reduced*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Vehicle May Roll Shift to P

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

EPB Automatically Applied

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Shift to P Before Exiting Vehicle

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Parking Brake Unavailable

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Parking Brake Temporarily Unavailable

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Each door open (image display)

Displayed

Input

CAN

Driver door courtesy switch signal

Main body ECU (Multiplex network body ECU)

Front passenger door courtesy switch signal

Rear right door courtesy switch signal

Rear left door courtesy switch signal

Luggage courtesy switch signal

Hood courtesy switch signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Clearance sonar detection (image display)*4

Displayed

Input

CAN

Combination meter display request signal

Clearance warning ECU assembly

Clearance sonar vehicle mark display request signal

Front center area information signal

Front left area information signal

Front right area information signal

Rear center area information signal

Rear left area information signal

Rear right area information signal

Clearance sonar information signal

Parking Assist Malfunction Visit Your Dealer*4

Displayed

Input

CAN

Combination meter display request signal

Clearance warning ECU assembly

Parking Assist Unavailable Clean Parking Assist Sensor*4

Displayed

Input

CAN

Combination meter display request signal

Clearance warning ECU assembly

Parking Assist Unavailable*4

Displayed

Input

CAN

Combination meter display request signal

Clearance warning ECU assembly

Rear Cross Traffic Alert Malfunction Visit Your Dealer

Displayed

Input

CAN

RCTA system status signal

Blind spot monitor sensor RH

Rear Cross Traffic Alert Unavailable

Displayed

Input

CAN

RCTA system status signal

Blind spot monitor sensor RH

Parking Brake Unavailable Vehicle May Roll Park on Flat Road

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Auto Power Off to Conserve Battery

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Parking Brake Unable to Disengage Press Brake and Push Parking Brake Switch to Release

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Parking Brake Unable to Disengage Close Door and Fasten Seat Belt

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Parking Brake ON

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Power Steering Malfunction Steering Power Low Visit Your Dealer

Displayed

Input

CAN

Multi-information display request signal

Power steering ECU (Rack and pinion power steering gear assembly)

Steering Power Low Visit Your Dealer

Displayed

Input

CAN

Multi-information display request signal

Power steering ECU (Rack and pinion power steering gear assembly)

Power Steering Malfunction Visit Your Dealer

Displayed

Input

CAN

Multi-information display request signal

Power steering ECU (Rack and pinion power steering gear assembly)

Brakehold Malfunction Press Brake to Deactivate Visit Your Dealer

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Warning Press Brake on Slope

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Wiper System Malfunction Visit Your Dealer

Displayed

Input

CAN

Wiper fault signal

Main body ECU (Multiplex network body ECU)

Key Not Detected Check Key Location

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Release Accelerator

Displayed

Input

CAN

Drive-start control multi-information request signal

ECM

LDA Hold Steering Wheel

Displayed

Input

CAN

Request for driver action display signal

Forward recognition camera

Hands-free caution text display signal

LDA Steering Assist Unavailable Hold Steering Wheel

Displayed

Input

CAN

Hands-free caution text display signal

Forward recognition camera

Check Engine Visit Your Dealer

Displayed

Input

CAN

Engine malfunction message signal

ECM

Check Engine Reduced Engine Power Visit Your Dealer

Displayed

Input

CAN

Engine malfunction message signal

ECM

Reduced Engine Power Visit Your Dealer

Displayed

Input

CAN

Engine malfunction message signal

ECM

Engine Maintenance Required Visit Your Dealer

Displayed

Input

CAN

Engine malfunction message signal

ECM

SRS Airbag System Malfunction Visit Your Dealer

Displayed

Input

CAN

Airbag warning light control request signal

Airbag ECU assembly

Antilock Brake System Malfunction Visit Your Dealer

Displayed

Input

CAN

ABS warning light control flag signal

Skid control ECU (Brake actuator assembly)

Engine Coolant Temp High Stop in a Safe Place See Owner's Manual

Displayed

Input

CAN

Engine coolant temperature signal

ECM

Charging System Malfunction Stop in a Safe Place See Owner's Manual

Displayed

Input

CAN

Charge indicator light signal

ECM

Radar Cruise Control Unavailable Clean Sensor

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Radar Cruise Control Unavailable

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Radar Cruise Control Unavailable Press Brake to Resume Driving

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Smart Key System Malfunction See Owner's Manual

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Blind Spot Monitor Unavailable

Displayed

Input

CAN

BSD module status signal

Blind spot monitor sensor RH

Cruise Control Malfunction Visit Your Dealer

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

Cruise Control Fault Press Brake to Deactivate Visit Your Dealer

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

LDA Malfunction Visit Your Dealer

Displayed

Input

CAN

Fault condition text display signal

Forward recognition camera

Front Camera Unavailable

Displayed

Input

CAN

PCS temperature message (Camera) signal

Driving support ECU assembly

LDA Unavailable

Displayed

Input

CAN

Steering assist unusable text display signal

Forward recognition camera

LDA Turned ON Steering Assist Active

Displayed

Input

CAN

LKA mode text display signal

Forward recognition camera

LDA Turned ON Steering Assist Unavailable

Displayed

Input

CAN

LKA mode text display signal

Forward recognition camera

Front Camera Unavailable Remove Debris On Windshield

Displayed

Input

CAN

PCS dust message (Camera) signal

Driving support ECU assembly

Pre-Collision System Malfunction Visit Your Dealer

Displayed

Input

CAN

PCS fault condition text display signal

Driving support ECU assembly

Blind Spot Monitor Malfunction Visit Your Dealer

Displayed

Input

CAN

BSD module status signal

Blind spot monitor sensor RH

Secondary Collision Brake system Malfunction Visit Your Dealer

Displayed

Input

CAN

MCB warning signal

Skid control ECU (Brake actuator assembly)

Oil Pressure Low Stop in a Safe Place See Owner's Manual

Displayed

Input

CAN

Engine RPM data signal

ECM

Direct line

Engine oil pressure signal

Engine oil pressure switch assembly

Parking Brake Malfunction Visit Your Dealer

Displayed

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Radar Cruise Active Please Pay Attention to Other Vehicles

Displayed

Input

CAN

ACC ASL display ID2 signal

ECM

LDA Unavailable Below Approx. 50km/h

Displayed

Input

CAN

Speed condition failure text display signal

Forward recognition camera

LDA Unavailable Below Approx. 32MPH

Displayed

Input

CAN

Speed condition failure text display signal

Forward recognition camera

LDA Unavailable at Current Speed

Displayed

Input

CAN

Speed condition failure text display signal

Forward recognition camera

Engine Stopped Steering Power Low

Displayed

Input

CAN

Multi-information request signal

Power steering ECU (Rack and pinion power steering gear assembly)

Turn Power Off

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

Would You Like to Take a Break?

Displayed

Input

CAN

SWS rest advisory display signal

Forward recognition camera

Please Take a Break

Displayed

Input

CAN

SWS rest advisory display signal

Forward recognition camera

Key Detected in Vehicle

Displayed

Input

CAN

Smart system warning 3 signal

Certification ECU (Smart key ECU assembly)

Turn Lights Off

Displayed

Input

CAN

Light reminder buzzer request signal

Main body ECU (Multiplex network body ECU)

Moon Roof Open*5

Displayed

Input

CAN

Slide roof open warning request signal

Main body ECU (Multiplex network body ECU)

Window Open

Displayed

Input

CAN

Power window open warning request signal

Main body ECU (Multiplex network body ECU)

Window / Moon Roof Open*5

Displayed

Input

CAN

Slide roof open warning request signal

Main body ECU (Multiplex network body ECU)

Power window open warning request signal

Press Brake Pedal and Touch Engine Switch with Key

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Not Ready to Drive Press Brake Pedal and Push Engine Switch to Start

Displayed

Input

CAN

Smart system warning 3 signal

Certification ECU (Smart key ECU assembly)

Press Brake Pedal and Push Engine Switch to Start

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Smart system warning 3 signal

Push Engine Switch while Turning the Steering Wheel in Either Direction

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Brakehold Malfunction Visit Your Dealer

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Less Effective During Icy Conditions

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Active Press Brake and Switch to Deactivate

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Unavailable Driver Door Open

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Unavailable Driver Seat Belt Unbuckled

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Unavailable Hood or Trunk Open

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Press Brake to Maintain Brakehold

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Close Driver Door to Maintain Brakehold

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Fasten Driver Seat Belt to Maintain Brakehold

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Unavailable

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Deactivated

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Brakehold Deactivated Parking Brake Automatically Applied

Displayed

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

ICS Malfunction Visit Your Dealer*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Drive-Start Control Malfunction Visit Your Dealer

Displayed

Input

CAN

Drive-start control multi-information request signal

ECM

Brake Override Malfunction Visit Your Dealer

Displayed

Input

CAN

Brake override system multi-information request signal

ECM

Key Battery Low Replace Key Battery

Displayed

Input

CAN

Smart system warning 1 signal

Certification ECU (Smart key ECU assembly)

Engine Oil Level Low Add or Replace

Displayed

Input

CAN

Engine RPM data signal

ECM

Engine coolant temperature signal

Direct line

Engine oil level signal

Engine oil level sensor

Headlight System Malfunction Visit Your Dealer

Displayed

Input

CAN

Smart beam indicator signal

Main body ECU (Multiplex network body ECU)

LED headlight indicator signal

Accelerator and Brake Pedals Pressed Simultaneously

Displayed

Input

CAN

Brake override system multi-information request signal

ECM

Setting Tire Pressure Warning System

Displayed

Input

CAN

TPMS warning indicator condition 1 signal

Main body ECU (Multiplex network body ECU)

Tire Pressure Recalibrating Please Wait until Complete

Displayed

Input

CAN

TPMS warning indicator condition 1 signal

Main body ECU (Multiplex network body ECU)

Tire Pressure Low Check Tire

Displayed

Input

CAN

TPMS warning indicator condition 1 signal

Main body ECU (Multiplex network body ECU)

Windshield Washer Fluid Low

Displayed

Input

Direct line

Washer fluid level signal

Level warning switch assembly

Fuel Low

Displayed

Input

Direct line

Fuel level signal

Fuel sender gauge assembly

Roads May Be Icy Drive with Care

Displayed

Input

CAN

Engine RPM data signal

ECM

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Ambient temperature display signal

Air conditioning amplifier assembly

Switch signal of 0 or 0.5 below decimal point of ambient temperature display

Traction Control Turned Off

Displayed

Input

CAN

Traction control off light signal

Skid control ECU (Brake actuator assembly)

Maintenance Required Soon

Displayed

-

-

-

-

-

Output

CAN

Previous oil maintenance flag signal

Radio and display receiver assembly

Maintenance Required Visit Your Dealer

Displayed

-

-

-

-

-

Output

CAN

Previous oil maintenance flag signal

Radio and display receiver assembly

Auto High Beam Ready Turn ON High Beam to Activate

Displayed

Input

CAN

Smart beam advice signal

Main body ECU (Multiplex network body ECU)

A New Key has been Registered Contact Your Dealer for Details

Displayed

Input

CAN

Smart system warning 2 signal

Certification ECU (Smart key ECU assembly)

VSC Turned Off Pre-Collision Brake System Unavailable

Displayed

Input

CAN

PB temporary unusable condition text display signal

Driving support ECU assembly

VSC OFF light signal

Skid control ECU (Brake actuator assembly)

Pre-Collision System Unavailable

Displayed

Input

CAN

PCS temporary unusable condition text display signal

Driving support ECU assembly

PCS temperature message (Radar) signal

ICS Unavailable*4

Displayed

Input

CAN

ICS multi-information signal

Clearance warning ECU assembly

Pre-Collision System Unavailable Clean Sensor

Displayed

Input

CAN

PCS dust message (Radar) signal

Driving support ECU assembly

Pre-Collision System Off

Displayed

Input

CAN

PCS warning message signal

Driving support ECU assembly

PCS warning distance unusable condition text display signal

PCS distance warning signal

PCS pedestrian warning signal

PCS preceding vehicle start notification signal

ACCESSORY

Displayed

Input

CAN

Display request of vehicle mode signal

Certification ECU (Smart key ECU assembly)

IGNITION ON

Displayed

Input

CAN

Display request of vehicle mode signal

Certification ECU (Smart key ECU assembly)

  • *1: w/ Navigation System
  • *2: w/o Adaptive Variable Suspension System
  • *3: w/ Adaptive Variable Suspension System
  • *4: w/ Intelligent Clearance Sonar System
  • *5: w/ Sliding Roof System

(d) Buzzer

Item

Condition

Input/Output

Communication line

Signal

Component

PCS warning buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Seat belt warning (for Driver side) buzzer

Sounds intermittently (Maximum 5 times)

Input

CAN

Driver seat belt switch signal

Main body ECU (Multiplex network body ECU)

Sounds once/Sounds intermittently

Input

CAN

Driver seat belt switch signal

Main body ECU (Multiplex network body ECU)

Parking brake switch signal

Shift position P signal

ECM

Shift position R signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Warning buzzer for P range position advice buzzer

Sounds continuously

Input

CAN

Buzzer request signal

Certification ECU (Smart key ECU assembly)

Push operation warning during driving buzzer

Sounds intermittently

Input

CAN

Buzzer request signal

Certification ECU (Smart key ECU assembly)

Seat belt warning (for Front passenger side) buzzer

Sounds once/Sounds intermittently

Input

CAN

Parking brake switch signal

Main body ECU (Multiplex network body ECU)

Shift position P signal

ECM

Shift position R signal

Front passenger seat occupant detection status signal

Airbag ECU assembly

Front passenger seat belt buckle switch detection status signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Seat belt warning (for Rear seat) buzzer

Sounds intermittently

Input

CAN

Parking brake switch signal

Main body ECU (Multiplex network body ECU)

Rear right door courtesy switch signal

Rear left door courtesy switch signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Shift selection P signal

ECM

Shift selection R signal

Direct line

Rear left seat belt buckle switch signal

Rear seat inner belt assembly LH

Rear center seat belt buckle switch signal

Rear right seat belt buckle switch signal

Rear seat inner with center belt assembly RH

Sounds once

Input

CAN

Parking brake switch signal

Main body ECU (Multiplex network body ECU)

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Shift selection P signal

ECM

Shift selection R signal

Direct line

Rear left seat belt buckle switch signal

Rear seat inner belt assembly LH

Rear center seat belt buckle switch signal

Rear right seat belt buckle switch signal

Rear seat inner with center belt assembly RH

Proximity warning buzzer of radar cruise control buzzer

Sounds intermittently

Input

CAN

ACC buzzer request signal

ECM

Pedestrian warning/vehicle distance time alert reminder buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Lane departure alert cancel buzzer

Sounds twice

Input

CAN

Lane departure alert cancel buzzer signal

Forward recognition camera

Vehicle roll warning buzzer (Engine stall)

Sounds continuously/Sounds intermittently

Input

CAN

Engine stall buzzer signal

ECM

Brake fluid low warning buzzer

Sounds intermittently

Input

CAN

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Direct line

Brake fluid level warning switch signal

Brake fluid level warning switch (Brake master cylinder reservoir assembly)

Vehicle speed pulse input signal

Skid control ECU (Brake actuator assembly)

Engine oil pressure warning buzzer

Sounds intermittently

Input

CAN

Engine RPM data signal

ECM

Direct line

Engine oil pressure signal

Engine oil pressure switch assembly

EPS warning buzzer

Sounds once/Sounds intermittently

Input

CAN

Demand buzzer to meter signal

Power steering ECU (Rack and pinion power steering gear assembly)

Lane departure alert warning buzzer

Sounds intermittently

Input

CAN

LDW buzzer signal

Forward recognition camera

Engine coolant temperature hot warning buzzer

Sounds once

Input

CAN

Engine coolant temperature signal

ECM

P range shift reminder and door open warning buzzer

Sounds continuously

Input

CAN

Meter buzzer continuation request signal

Certification ECU (Smart key ECU assembly)

Smart key warning buzzer

Sounds intermittently

Input

CAN

Meter buzzer intermittence request signal

Certification ECU (Smart key ECU assembly)

Sounds intermittently (Maximum 9 times)

Input

CAN

Meter buzzer intermittent request (0.7 sec. cycle) signal

Sounds once

Input

CAN

Meter buzzer single-shot request signal

Brake operation request buzzer for cruise control

Sounds intermittently

Input

CAN

ACC buzzer request signal

ECM

Multi-information display warning buzzer

Sounds once

-

-

-

-

Electric parking brake cancel buzzer

Sounds once

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Brake hold control non-cancellation warning buzzer

Sounds twice

Input

CAN

Brake hold information control flag signal

Skid control ECU (Brake actuator assembly)

Radar cruise low speed cancel buzzer

Sounds twice

Input

CAN

ACC buzzer request signal

ECM

Preceding vehicle lost at low speed buzzer

Sounds four times

Input

CAN

ACC buzzer request signal

ECM

Lane departure alert hands-free caution buzzer

Sounds intermittently

Input

CAN

Hands-free caution text display signal

Forward recognition camera

Immobiliser key identification completion buzzer

Sounds once

Input

CAN

Immobiliser key identification completion signal

Certification ECU (Smart key ECU assembly)

Driving with parking brake unreleased warning buzzer

Sounds intermittently

Input

CAN

EPB multi-information display control signal

Skid control ECU (Brake actuator assembly)

Driving with door open warning buzzer

Sounds intermittently

Input

CAN

Driver door courtesy switch signal

Main body ECU (Multiplex network body ECU)

Front passenger door courtesy switch signal

Rear right door courtesy switch signal

Rear left door courtesy switch signal

Luggage courtesy switch signal

Hood courtesy switch signal

Vehicle speed (SP1) signal

Skid control ECU (Brake actuator assembly)

Unsteady driving alert buzzer

Sounds twice

Input

CAN

SWS buzzer request signal

Forward recognition camera

Sports shift reject buzzer

Sounds twice

Input

CAN

Reject buzzer signal

ECM

Light reminder buzzer

Sounds continuously

Input

CAN

Light reminder buzzer request signal

Main body ECU (Multiplex network body ECU)

Pre-collision brake assist notification buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

PCS notification buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Brake inspections standby mode notification buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Radar axis adjustment is complete buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Camera axis adjustment complete buzzer

Sounds intermittently

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Pre-collision brake notification buzzer

Sounds continuously

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Brake inspection normal return notification buzzer

Sounds continuously

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Radar axis adjustment incomplete notification buzzer

Sounds continuously

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Camera adjustment start notification buzzer

Sounds continuously

Input

CAN

PCS meter buzzer request (extend) signal

Driving support ECU assembly

Turn signal flasher buzzer

Sounds intermittently

Input

CAN

Hazard light blinking flag signal

Skid control ECU (Brake actuator assembly)

Hazard light activation request signal

DCM (Telematics transceiver)*

Flasher request signal

Main body ECU (Multiplex network body ECU)

Airbag hazard light control request signal

Airbag ECU assembly

Left turn light signal lever position

Steering sensor

Right turn light signal lever position

Left cornering light signal lever position

Right cornering light signal lever position

Direct line

Hazard warning switch signal

Hazard warning switch assembly (Radio and display receiver assembly)

  • *: w/ Manual (SOS) Switch

(e) Others

Item

Condition

Input/Output

Communication line

Signal

Component

Speed signal for Direct line

-

Input

Direct line

Vehicle speed pulse input signal

Skid control ECU (Brake actuator assembly)

Output

Direct line

Vehicle speed pulse output signal

Related ECUs

Warning/Diagnosis notification*1

-

Output

CAN

Vehicle warning signal (Anti-Lock brake system warning)

DCM (Telematics transceiver)

Vehicle warning signal (Electronically controlled brake system)

Vehicle warning signal (Brake control system warning)

Vehicle warning signal (Brake fluid level warning)

Vehicle warning signal (Electric parking brake system warning)

Vehicle warning signal (Charging system warning)

Vehicle warning signal (Check engine warning)

Vehicle warning signal (Engine oil pressure warning)

Vehicle warning signal (Engine oil level warning)

Vehicle warning signal (Schedule maintenance warning)

Vehicle warning signal (Engine coolant temperature hot warning)

Vehicle warning signal (Airbag system warning)

Vehicle warning signal (Power steering system warning)

Vehicle warning signal (Tire pressure warning system warning)

Vehicle warning signal (Tire pressure low warning)

Warning/Diagnosis notification*1

-

Output

CAN

Vehicle warning signal (Dynamic radar cruise control system warning)

DCM (Telematics transceiver)

Vehicle warning signal (Pre-collision system warning)

Vehicle warning signal (Lane departure alert system warning)

Vehicle warning signal (Blind spot monitor system warning)

Vehicle warning signal (Intuitive parking assist system warning)*2

Vehicle warning signal (Smart key system warning)

Vehicle warning signal (Automatic high beam system warning)

Vehicle warning signal (Washer fluid level warning)

Vehicle warning signal (Brake override system warning)

Vehicle warning signal (Drive start control warning)

Vehicle warning signal (Headlight system warning)

Vehicle warning signal (Wiper and washer system warning)

Vehicle warning signal (Intelligent clearance sonar system warning)*2

Vehicle warning signal (Secondary collision brake system warning)

Vehicle warning signal (Rear crossing traffic alert system warning)

  • *1: w/ Manual (SOS) Switch
  • *2: w/ Intelligent Clearance Sonar System
    Steering Pad Switch Circuit

    System Diagram

    See More:

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Power Mirror Control System(for Hv Model With Memory): Terminals Of Ecu
    TERMINALS OF ECU CHECK OUTER MIRROR CONTROL ECU ASSEMBLY LH (a) Disconnect the I21 outer mirror control ECU assembly LH connector. (b) Measure the voltage and resistance according to the value(s) in the table below. HINT: Measure the values on the wire harness side with the connector disconnected. T ...

    Toyota Avalon (XX50) 2019-2022 Owners Manual

    Toyota Avalon (XX50) 2019-2022 Service & Repair Manual

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