Lexus NX: Front Power Seat does not Operate with Front Power Seat Switch

Lexus NX Service 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 front power seat switch LH. The built-in ECU manages the signals received from the power seat switch, and operates each motor. If the front power seat switch LH receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the front power seat switch 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 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.

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

(a) Disconnect the g11 and g12 front power seat switch LH connectors.

*a

Front view of wire harness connector

(to Front Power Seat Switch LH)

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

Standard Resistance:

Tester Connection

Condition

Specified Condition

g11-2 (GND) - Body ground

Always

Below 1 Ω

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

Standard Voltage:

Tester Connection

Switch Condition

Specified Condition

g11-7 (+B) - Body ground

Power switch off

11 to 14 V

g12-3 (IG) - Body ground

Power switch on (IG)

11 to 14 V

Power switch off

Below 1 V

g12-12 (SYSB) - Body ground

Power switch off

11 to 14 V

OK

REPLACE FRONT POWER SEAT SWITCH LH

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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