Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Terminals Of Ecu

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System(for Entry Function, Gasoline Model) / Terminals Of Ecu

TERMINALS OF ECU

CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

(a) Disconnect the G40 certification ECU (smart key ECU assembly) connector.

(b) Measure the voltage and resistance according to the value(s) in the table below.

Tester Connection

Wiring Color

Input/Output

Terminal Description

Condition

Specified Condition

G40-18 (E) - Body ground

W-B - Body ground

-

Ground

Always

Below 1 Ω

G40-4 (+B) - G40-18 (E)

W - W-B

Input

Power supply

Always

11 to 14 V

G40-15 (CUTB) - G40-18 (E)

R - W-B

Input

Dark current cut pin*

Always

11 to 14 V
  • *: In order to prevent the vehicle battery from being depleted when the vehicle is shipped long distances, a fuse that cuts unnecessary electrical load while the vehicle is being shipped is installed in the circuit. If the fuse is removed, the circuit becomes open. If the fuse that is between the vehicle battery and terminal CUTB is removed and the circuit is open, the certification ECU (smart key ECU assembly) changes to a certain control mode (example: the transmission of radio waves every 0.25 seconds, which form the detection area, stops).

(c) Reconnect the G40 certification ECU (smart key ECU assembly) connector.

(d) Measure the voltage and check for pulses according to the value(s) in the table below.

Tester Connection

Wiring Color

Input/Output

Terminal Description

Condition

Specified Condition

G40-17 (IG1D) - G40-18 (E)

R - W-B

Output

IG power supply

Engine switch off → on (IG)

Below 1 V → 10 V or higher

K10-17 (CLG1) - G40-18 (E)

R - W-B

Output

Output to driver door electrical key antenna

(request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

Pulse generation

(See waveform 1)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

Pulse generation

(See waveform 2)

K10-17 (CLG1) - G40-18 (E)

R - W-B

Input

Input to driver door lock sensor

(front door outside handle assembly (for driver door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

  5. Driver door lock sensor touched

Pulse generation

(See waveform 3)

K10-17 (CLG1) - G40-18 (E)

R - W-B

Input

Input to driver door unlock sensor

(when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Driver door unlock sensor touched

Pulse generation

(See waveform 4)

K10-16 (CG1B) - G40-18 (E)

GR - W-B

Output

Output to driver door electrical key antenna (terminal on opposite side of component from CLG1 output terminal)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

Pulse generation

(See waveform 5)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

Pulse generation

(See waveform 6)

K10-15 (CLG2) - G40-18 (E)

R - W-B

Output

Output to front passenger door electrical key antenna

(request signal (challenge) is sent to door electrical key antenna from certification ECU (smart key ECU assembly) to form detection area)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

Pulse generation

(See waveform 1)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

Pulse generation

(See waveform 2)

K10-15 (CLG2) - G40-18 (E)

R - W-B

Input

Input to front passenger door lock sensor

(front door outside handle assembly (for front passenger door) lock sensor on signal is sent to the certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

  5. Front passenger door lock sensor touched

Pulse generation

(See waveform 3)

K10-15 (CLG2) - G40-18 (E)

R - W-B

Input

Input to front passenger door unlock sensor

(when system is in unlock standby mode and unlock sensor is touched, door electrical key antenna sends unlock sensor input signal (sensing) to certification ECU (smart key ECU assembly))

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Front passenger door unlock sensor touched

Pulse generation

(See waveform 4)

K10-14 (CG2B) - G40-18 (E)

W - W-B

Output

Output to front passenger door electrical key antenna (terminal on opposite side of component from CLG2 output terminal)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)

Pulse generation

(See waveform 5)

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

Pulse generation

(See waveform 6)

K10-11 (CLG7) - G40-18 (E)

GR - W-B

Output

Output to No. 1 indoor electrical key antenna assembly (inside luggage compartment)

Procedure:

  1. Door is closed
  2. Engine switch off
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Driver door lock sensor touched

Pulse generation

(See waveform 7)

K10-10 (CG7B) - G40-18 (E)

R - W-B

Output

Output to No. 1 indoor electrical key antenna assembly (inside luggage compartment) (terminal on opposite side of component from CLG7 output terminal)

Procedure:

  1. Door is closed
  2. Engine switch off
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Driver door lock sensor touched

Pulse generation

(See waveform 7)

K10-13 (CLG8) - G40-18 (E)

G - W-B

Output

Output to electrical key antenna (outside luggage compartment)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Luggage electrical key switch off → on

Pulse generation

(See waveform 8)

K10-12 (CG8B) - G40-18 (E)

L - W-B

Output

Output to electrical key antenna (outside luggage compartment) (terminal on opposite side of component from CLG8 output terminal)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Luggage electrical key switch off → on

Pulse generation

(See waveform 8)

K10-26 (TSW5) - G40-18 (E)

LG - W-B

Input

Luggage electrical key switch signal input

Luggage electrical key switch off → on

Pulse generation

(See waveform 9)

K10-18 (RCO) - G40-18 (E)

B - W-B

Output

Output to electrical key and tire pressure monitoring system receiver assembly

(Power supply for electrical key and tire pressure monitoring system receiver assembly. Certification ECU (smart key ECU assembly) outputs 5 V when receiver starts operating.)

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 10)

K10-19 (RDAM) - G40-18 (E)

G - W-B

Input

Electrical key and tire pressure monitoring system receiver assembly verifies data received from electrical key transmitter sub-assembly.

Electrical key and tire pressure monitoring system receiver assembly sends data from electrical key transmitter sub-assembly to certification ECU (smart key ECU assembly) (Electrical key and tire pressure monitoring system receiver assembly intermittently grounds 12 V signal from certification ECU (smart key ECU assembly)).

Proceed:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

Pulse generation

(See waveform 11)

K10-20 (CSEL) - G40-18 (E)

BE - W-B

Output

Communication channel switching circuit

Procedure:

  1. Engine switch off
  2. All doors closed

Below 1 V → Pulse generation
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(e) Using an oscilloscope, check waveform 1.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 1 (Reference)

Item

Content

Tester Connection

K10-17 (CLG1) - G40-18 (E)

K10-15 (CLG2) - G40-18 (E)

Tool Setting

5 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(f) Using an oscilloscope, check waveform 2.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 2 (Reference)

Item

Content

Tester Connection

K10-17 (CLG1) - G40-18 (E)

K10-15 (CLG2) - G40-18 (E)

Tool Setting

5 V/DIV., 100 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(g) Using an oscilloscope, check waveform 3.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Lock sensor not touched

*b

Lock sensor touched
Waveform 3 (Reference)

Item

Content

Tester Connection

K10-17 (CLG1) - G40-18 (E)

K10-15 (CLG2) - G40-18 (E)

Tool Setting

5 V/DIV., 40 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)

  5. Lock sensor not touched → touched
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(h) Using an oscilloscope, check waveform 4.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Unlock sensor not touched

*b

Unlock sensor touched
Waveform 4 (Reference)

Item

Content

Tester Connection

K10-17 (CLG1) - G40-18 (E)

K10-15 (CLG2) - G40-18 (E)

Tool Setting

5 V/DIV., 50 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors locked
  4. Electrical key transmitter sub-assembly not near the vehicle
  5. Unlock sensor not touched → touched

(i) Using an oscilloscope, check waveform 5.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 5 (Reference)

Item

Content

Tester Connection

K10-16 (CG1B) - G40-18 (E)

K10-14 (CG2B) - G40-18 (E)

Tool Setting

5 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought inside detection area*)
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(j) Using an oscilloscope, check waveform 6.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 6 (Reference)

Item

Content

Tester Connection

K10-16 (CG1B) - G40-18 (E)

K10-14 (CG2B) - G40-18 (E)

Tool Setting

5 V/DIV., 100 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors closed
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. All doors locked through wireless operation

    (electrical key transmitter sub-assembly brought outside detection area*)
  • *: For details about the entry function detection area, refer to Operation Check.

    Click here

(k) Using an oscilloscope, check waveform 7.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Driver door lock sensor not touched

*b

Driver door lock sensor touched
Waveform 7 (Reference)

Item

Content

Tester Connection

K10-11 (CLG7) - G40-18 (E)

K10-10 (CG7B) - G40-18 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Door is closed
  2. Engine switch off
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Driver door lock sensor touched

(l) Using an oscilloscope, check waveform 8.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

Waveform 8 (Reference)

Item

Content

Tester Connection

K10-13 (CLG8) - G40-18 (E)

K10-12 (CG8B) - G40-18 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside vehicle
  3. All doors closed
  4. Luggage electrical key switch off → on

(m) Using an oscilloscope, check waveform 9.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Checking for switch on signal at short intervals
Waveform 9 (Reference)

Item

Content

Tester Connection

K10-26 (TSW5) - G40-18 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition

Luggage electrical key switch off → on

(n) Using an oscilloscope, check waveform 10.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 10 (Reference)

Item

Content

Tester Connection

K10-18 (RCO) - G40-18 (E)

Tool Setting

2 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  3. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

(o) Using an oscilloscope, check waveform 11.

NOTICE:

The oscilloscope waveform shown in the illustration is an example for reference only. Noise, chattering, etc. are not shown.

*a

Before lock or unlock switch of electrical key transmitter sub-assembly pressed

*b

After lock or unlock switch of electrical key transmitter sub-assembly pressed
Waveform 11 (Reference)

Item

Content

Tester Connection

K10-19 (RDAM) - G40-18 (E)

Tool Setting

5 V/DIV., 500 ms/DIV.

Condition

Procedure:

  1. Engine switch off
  2. All doors locked
  3. Electrical key transmitter sub-assembly not inside vehicle
  4. Electrical key transmitter sub-assembly brought outside detection area but kept inside wireless function operational area
  5. Lock or unlock switch of electrical key transmitter sub-assembly not pressed → pressed

CHECK INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY AND MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)

(a) Remove the main body ECU (multiplex network body ECU) from the instrument panel junction block assembly.

Click here

(b) Measure the voltage and resistance according to the value(s) in the table below.

Tester Connection

Wiring Color

Input/Output

Terminal Description

Condition

Specified Condition

MB-11 (GND1) - Body ground

-

-

Ground

Always

Below 1 Ω

MB-31 (BECU) - Body ground

-

Input

Battery power supply (for CPU)

Always

11 to 14 V
    System Diagram

    Touching Unlock Sensor for Certain Period of Time does not Unlock All Doors

    See More:

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

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