Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Problem Symptoms Table

PROBLEM SYMPTOMS TABLE

NOTICE:

Before replacing the main body ECU (multiplex network body ECU) or certification ECU (smart key ECU assembly), refer to Registration.

HINT:

Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, the potential causes of the symptoms are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking the suspected areas in the order they are listed. Replace parts as necessary.

Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Map Light

Symptom	Suspected Area	Link
Map light LH or map light RH does not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
Map light LH and map light RH do not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
	Harness or connector	-
Switch illumination or shift lever illumination does not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
Switch illumination and shift lever illumination do not illuminate (Other interior lights are normal)	Map light (Roof console box sub-assembly)
	Harness or connector	-

Room Light

Symptom	Suspected Area	Link
Spot light LH or spot light RH does not illuminate (Other interior lights are normal)	Spot light assembly
Spot light LH and spot light RH do not illuminate (Other interior lights are normal)	Spot light assembly
	Harness or connector	-

Vanity Light

Symptom	Suspected Area	Link
Vanity light LH does not illuminate	Bulb
	Visor assembly LH
	Harness or connector	-
Vanity light RH does not illuminate	Bulb
	Visor assembly RH
	Harness or connector	-

Courtesy Light

Symptom	Suspected Area	Link
Courtesy light LH does not illuminate	Bulb
	Courtesy light assembly LH
	Front door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)
Courtesy light RH does not illuminate	Bulb
	Courtesy light assembly RH
	Front door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)

Glove Box Light

Symptom	Suspected Area	Link
Glove box light does not illuminate	Glove box light assembly
Glove box light does not illuminate	Harness or connector	-

Console Box Light

Symptom	Suspected Area	Link
Console box light does not illuminate	Console box light (No. 5 interior illumination light sub-assembly)
Console box light does not illuminate	Harness or connector	-

Footwell Light and Front Console Light

Symptom	Suspected Area	Link
Front footwell light LH does not illuminate	Front footwell light LH (No. 1 interior illumination light sub-assembly)
Front footwell light LH does not illuminate	Harness or connector	-
Front footwell light RH does not illuminate	Front footwell light RH (No. 1 interior illumination light sub-assembly)
Front footwell light RH does not illuminate	Harness or connector	-
Rear footwell light LH does not illuminate.	Rear footwell light LH (No. 6 interior illumination light sub-assembly)
Rear footwell light LH does not illuminate.	Harness or connector	-
Rear footwell light RH does not illuminate	Rear footwell light RH (No. 6 interior illumination light sub-assembly)
Rear footwell light RH does not illuminate	Harness or connector	-
Front console light does not illuminate	Front console light (interior illumination light sub-assembly)
Front console light does not illuminate	Harness or connector	-
All footwell lights and front console light do not illuminate	Harness or connector	-
	Combination meter assembly

Ambient Illumination Light (w/ Mood Switch)

Symptom	Suspected Area	Link
Front door inside handle illumination light LH does not illuminate	Ambient illumination light circuit
Front door inside handle illumination light RH does not illuminate	Ambient illumination light circuit
Console light (for passenger side) does not illuminate	Ambient illumination light circuit
Console light (for driver side) does not illuminate	Ambient illumination light circuit
Cup holder light (for front side) does not illuminate	Ambient illumination light circuit
Cup holder light (for rear side) does not illuminate	Ambient illumination light circuit
All ambient illumination lights do not illuminate	Ambient illumination light circuit
	Ambient light switch circuit
	Instrument panel junction block assembly
	Main body ECU (Multiplex network body ECU)

Luggage Compartment Light

Symptom	Suspected Area	Link
Luggage compartment light does not illuminate (Other interior lights are normal)	Bulb
	No. 1 luggage compartment light assembly
	Luggage compartment door courtesy switch circuit
	Harness or connector	-
	Main body ECU (Multiplex network body ECU)

Interior Light Power Source Control

Symptom	Suspected Area	Link
All the interior lights that receive power via the DOME CUT relay do not illuminate	Interior light auto cut circuit
	Main body ECU (Multiplex network body ECU)

Illuminated Entry System

Symptom	Suspected Area	Link
All illuminated entry system control functions do not operate under any condition	Check customize parameters (Interior Light Control)
	Interior light auto cut circuit
	Interior light circuit
	Main body ECU (Multiplex network body ECU)
Actuation area-linked control function does not operate when registered key is brought into any exterior detection area	Check customize parameters (Room Light when Aprchd)
	CAN communication system
	Smart key system (for Entry Function)
	Main body ECU (Multiplex network body ECU)
Door lock/unlock-linked control function does not operate when doors are locked/unlocked	Check customize parameters (I/L ON W/Door Key Unlock)
	Door unlock detection switch circuit
	Main body ECU (Multiplex network body ECU)
Door open/close-linked control function does not operate when doors are opened/closed	Front door courtesy switch circuit
	Rear door courtesy switch circuit
	Main body ECU (Multiplex network body ECU)
Engine switch-linked control function does not operate when engine switch is operated	Check customize parameters (I/L when ACC OFF)
	IG signal circuit
	ACC signal circuit
	Main body ECU (Multiplex network body ECU)
Engine switch illumination does not illuminate	CAN communication system
	Engine switch illumination circuit
	Certification ECU (Smart key ECU assembly)
Ambient light dimmer control does not operate with mood switch operation	Ambient light switch circuit
	Main body ECU (Multiplex network body ECU)

Battery Saving Control System

Symptom	Suspected Area	Link
Battery saving function does not operate	IG signal circuit
	ACC signal circuit
	Front door courtesy switch circuit
	Rear door courtesy switch circuit
	Luggage compartment door courtesy switch circuit
	Door unlock detection switch circuit
	Interior light auto cut circuit
	Main body ECU (Multiplex network body ECU)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Power Tilt And Power Telescopic Steering Column System(for Gasoline Model): IG Power Source Circuit
DESCRIPTION When the engine switch is turned on (IG), the IG power source circuit supplies positive (+) voltage to the multiplex tilt and telescopic ECU. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. PR ...

Toyota Avalon (XX50) 2019-2022 Owners Manual