Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual: Front Power Seat does not Operate with Front Power Seat Switch

Lexus RX (RX 350L, RX450h) 2016-2025 Repair Manual / Vehicle Interior / Seat / Front Power Seat Control System (w/ Memory) / Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

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

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 position control ECU and switch assembly 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.

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

(a) Disconnect the c5 and c6 position control ECU and switch assembly LH connectors.

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

Standard Voltage:

Tester Connection

Condition

Specified Condition

c5-7 (+B) - Body ground

Always

11 to 14 V

c6-3 (IG) - Body ground

Engine switch on (IG)

11 to 14 V

c6-3 (IG) - Body ground

Engine switch off

Below 1 V
NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

3.

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

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

c5-2 (GND) - Body ground

Always

Below 1 Ω
OK

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR
    Short in Sensor with Motor Power Supply Circuit (B2658)
    DESCRIPTION This DTC is stored when the slide motor is being operated (the slide motor position sensor is being supplied with power) and the power supply voltage does not rise to the specified value. ...

    One or more Power Seat Motors do not Operate
    DESCRIPTION Signals are input into the position control ECU and switch assembly LH. The built-in ECU manages the signals received from the position control ECU and switch assembly LH, and operates eac ...

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