Power Seat Motor Circuit

SEAT: FRONT POWER SEAT CONTROL SYSTEM: Power Seat Motor Circuit

Power Seat Motor Circuit

DESCRIPTION

When the power seat control switch is operated, a command signal is sent to the position control ECU and switch assembly (power seat control switch and ECU). The front power seat switch then controls the appropriate seat motor as needed. This memory system does not use a seat position sensor. The seat position is detected by counting pulses that are output when the motor turns. If there is no pulse output from the motor, the motor will stop operating. The position control ECU and switch assembly (power seat control switch and ECU) is designed so that any malfunction of the seat memory system will not interfere with manual seat control.
If the position control ECU and switch assembly (power seat control switch and ECU) detects a low motor speed, abnormal activity, or sudden motor current fluctuation, the system will stop the motor. If the motor operates continuously for 120 seconds or more, the system will stop the motor until the switch is turned on again.

WIRING DIAGRAM









INSPECTION 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 switches.
Result:






B -- CHECK WIRE HARNESS (POWER SEAT CONTROL SWITCH - BATTERY AND BODY GROUND)
A -- Continue to next step.
2. READ VALUE USING TECHSTREAM (FRONT POWER SEAT SWITCH)
(a) Check the Data List for proper functioning of the front power seat switch.

Driver Seat





OK:
On tester screen, each item changes between ON and OFF according to above chart.
NG -- REPLACE POSITION CONTROL ECU & SWITCH ASSEMBLY
OK -- Continue to next step.
3. PERFORM ACTIVE TEST USING TECHSTREAM (POWER SEAT MOTOR)
(a) Select the Active Test, use Techstream to generate a control command, and then check that the power seat motors operate.

Driver Seat





OK:
The power seat motors operate normally.
NG -- INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
4. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
(a) Inspect the power seat motor Front Seat Frame With Adjuster.
OK:
The power seat motor operates.
NG -- REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (POSITION CONTROL ECU AND SWITCH ASSEMBLY - POWER SEAT MOTOR)





(a) Disconnect the position control ECU and switch assembly connector and power seat motor connectors.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
6. CHECK WIRE HARNESS (POWER SEAT CONTROL SWITCH - BATTERY AND BODY GROUND)





(a) Disconnect the P49 switch connector.
(b) Measure the voltage and resistance of the wire harness side connectors.
Standard voltage (Driver side):






Standard resistance (Driver side):






NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. INSPECT POWER SEAT CONTROL SWITCH (LUMBER SUPPORT CONTROL)
(a) Inspect the power seat control switch Power Seat Switch.
NG -- REPLACE POWER SEAT CONTROL SWITCH (LUMBER SUPPORT CONTROL)
OK -- Continue to next step.
8. INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
(a) Inspect the power seat motor Front Seat Frame With Adjuster.
OK:
The power seat motor operates.
NG -- REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SEAT CONTROL SWITCH - POWER SEAT MOTOR)