Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Front Power Seat does not Operate with Front Power Seat Switch

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual / Vehicle Interior / Seat / Front Power Seat Control System(for Hv Model With Memory) / Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

Signals are input into the position control ECU assembly. The built-in ECU manages the signals received from the power seat switch and operates each motor. If the position control ECU assembly receives more than 2 motor operation signals for the same motor, the motor will be stopped. Manual operation resumes when the position control ECU assembly receives only 1 signal.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE

1.

CHECK FRONT POWER SEAT OPERATION

(a) Check that each function of the power seat operates normally by using the front power seat switch LH.

Click here

Result

Proceed to

All power seat functions do not operate

A

One or more power seat functions do not operate

B
B

GO TO OTHER DIAGNOSIS PROCEDURE (One or more Power Seat Motors do not Operate)

A

2.

INSPECT FRONT POWER SEAT SWITCH LH

(a) Remove the front power seat switch LH.

Click here

(b) Inspect the front power seat switch LH.

Click here

NG

REPLACE FRONT POWER SEAT SWITCH LH

OK

3.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - POWER SUPPLY)

(a) Disconnect the R33 and R32 position control ECU assembly connectors.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

R33-3 (B) - Body ground

Power switch off

11 to 14 V

R32-15 (SYSB) - Body ground

Power switch off

11 to 14 V

R32-1 (IG) - Body ground

Power switch on (IG)

11 to 14 V

R32-1 (IG) - Body ground

Power switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

4.

CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU ASSEMBLY - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

R33-2 (E) - Body ground

Always

Below 1 Ω
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

5.

CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

R31-20 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE POSITION CONTROL ECU ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Dtc Check / Clear

    How To Proceed With Troubleshooting

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