Toyota Tundra Service Manual: Front Power Seat does not Operate with Front Power Seat Switch

Toyota Tundra Service Manual / Vehicle Interior / Seat / Front Power Seat Control System(w/ Memory) / Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

When a signal is input into the position control ECU and switch assembly, the ECU manages the signals received from the power seat switches, and operates each motors. If the position control ECU and switch assembly receives more than 2 motors operation signals, the motor is stopped. Manual operation is restarted after the position control ECU and switch assembly receives 1 signal only.

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK FRONT POWER SEAT OPERATION

(a) Check that each function of the power seat operates normally by using the power seat switches (See page ).

Result

Result	Proceed to
All power seat functions does not operate	A
One or more power seat functions does not operate	B

Go to OTHER FLOW CHART (One or more Power Seat Motors do not Operate)

2.	CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY AND BODY GROUND)

(a) Disconnect the Z9 and Z10 position control ECU and switch assembly connectors.

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
Z9-7 (+B1) - Body ground	Always	11 to 14 V
Z10-12 (SYSB) - Body ground	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
Z9-2 (GND1) - Body ground	Always	Below 1 Ω

REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY

REPAIR OR REPLACE HARNESS OR CONNECTOR

Dtc Check / Clear

How To Proceed With Troubleshooting

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