One Or More Power Seat Motors Do Not Operate

SEAT: FRONT POWER SEAT CONTROL SYSTEM (w/ Memory): One or more Power Seat Motors do not Operate
- One or more Power Seat Motors do not Operate

DESCRIPTION

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

WIRING DIAGRAM

INSPECTION PROCEDURE

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 switch Operation Check.

Result:

D -- INSPECT LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY)

C -- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY)

B -- GO TO OTHER FLOW CHART (Front Power Seat does not Operate with Front Power Seat Switch) Front Power Seat Does Not Operate With Front Power Seat Switch
A -- Continue to next step.

2. READ VALUE USING TECHSTREAM (POWER SEAT SWITCH)

(a) Connect the Techstream to the DLC3.

(b) Turn the power switch on (IG).

(c) Turn the Techstream on.

(d) Enter the following menus: Body Electrical / Driver Seat / Data List.

(e) Read the Data List according to the display on the Techstream.

Driver Seat (Position Control ECU and Switch Assembly)

OK:

ON or OFF is displayed on the Techstream according to the table above.

NG -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal
A -- Continue to next step.

3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR)

(a) Enter the following menus: Body Electrical / Driver Seat / Active Test.

(b) Perform the Active Test according to the display on the Techstream.

Driver Seat (Position Control ECU and Switch Assembly)

Result:

C -- INSPECT SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY

B -- INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY

A -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

4. INSPECT SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY

(a) Disconnect the X1, X2 or X3 connector from each motor.

HINT
Check the motor operation of applicable function.

(b) Check the operation of the slide motor.

(1) Check if the seat cushion spring moves smoothly when the auxiliary battery is connected to the slide motor connector terminals.

OK:

Text in Illustration

(1) Check if the seat cushion spring moves smoothly when the auxiliary battery is connected to the front vertical motor connector terminals.

OK:

Text in Illustration

(d) Check the operation of the lifter motor.

(1) Check if the seat cushion spring moves smoothly when the auxiliary battery is connected to the lifter motor connector terminals.

OK:

Text in Illustration

Result:

B -- CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

A -- REPLACE SEPARATE TYPE FRONT SEAT CUSHION SPRING ASSEMBLY Removal

5. INSPECT SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY

(a) Disconnect Y1 reclining motor connector.

(b) Check the operation of the reclining motor.

(1) Check if the seat back moves smoothly when the auxiliary battery is connected to the reclining motor connector terminals.

OK:

Text in Illustration

NG -- REPLACE SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY Removal
OK -- Continue to next step.

6. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)

(a) Disconnect the X4 position control ECU and switch assembly connector.

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

HINT
Check the wire harness and connector between the position control ECU and switch assembly and applicable motor.

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

7. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - BATTERY)

(a) Disconnect the X5 position control ECU and switch assembly connector.

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

Standard Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal

8. INSPECT LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY)

(a) Remove the lumbar support adjustment switch (power seat switch assembly) Removal.

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

Standard Resistance:

Text in Illustration

NG -- REPLACE LUMBAR SUPPORT ADJUSTMENT SWITCH (POWER SEAT SWITCH ASSEMBLY) Removal
OK -- Continue to next step.

9. INSPECT LUMBAR SUPPORT ADJUSTER ASSEMBLY (SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY)

(a) Disconnect Y2 lumbar support adjuster motor connector.

(b) Check the operation of the lumbar support adjuster assembly.

(1) Check that the seat back moves smoothly when the auxiliary battery is connected to the lumbar support adjuster assembly connector terminals.

OK:

Text in Illustration

NG -- REPLACE SEPARATE TYPE FRONT SEAT BACK SPRING ASSEMBLY Removal
OK -- Continue to next step.

10. CHECK HARNESS AND CONNECTOR (LUMBAR SWITCH - POSITION CONTROL ECU AND LUMBAR MOTOR)

(a) Disconnect the X4 position control ECU and switch assembly connector.

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

Standard Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR

OK -- REPLACE POSITION CONTROL ECU AND SWITCH ASSEMBLY Removal