FRONT POWER SEAT CONTROL SYSTEM > Power Seat Motor Circuit

for Preparation Click here


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


B111872E01


INSPECTION PROCEDURE

1.PERFORM ACTIVE TEST BY INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch on.

  1. Perform the ACTIVE TEST by following the directions on the tester screen.

    D_SEAT (Position control ECU and switch assembly) 
    Item
    		Test Details
    		Diagnostic Note
    Seat Reclining
    		Test detail: reclining operation FRONT/REAR
    Vehicle condition: stopped
    		-
    Front Vertical Operation
    		Test detail: front vertical operation UP/DOWN
    Vehicle condition: stopped
    		-
    Lifter Operation
    		Test detail: lifter operation UP/DOWN
    Vehicle condition: stopped
    		-
    Seat Slide Operation
    		Test detail: sliding operation UP/DOWN
    Vehicle condition: stopped
    		-

    OK:
    Each power seat motor operates.



NG
Go to step 2
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

2.INSPECT FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)

  1. Inspect the power seat motor (Click here).

    OK:
    The power seat motor operates.



NG
REPLACE FRONT SEAT ADJUSTER SUB-ASSEMBLY (POWER SEAT MOTOR)
OK


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


    B112268E02

  1. Disconnect the position control ECU and switch assembly connector and power seat motor connectors.

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

    Resistance:
    LHD:
    Tester Connection
    		Condition
    		Specified Condition
    P31-2(SLD+) - P36-1
    		Always
    		Below 1 Ω
    P31-3(SLD-) - P36-2
    		Always
    		Below 1 Ω
    P31-4(FRV-) - P32-2
    		Always
    		Below 1 Ω
    P31-6(FRV+) - P32-1
    		Always
    		Below 1 Ω
    P31-7(LFT+) - P33-2
    		Always
    		Below 1 Ω
    P31-9(LFT-) - P33-1
    		Always
    		Below 1 Ω
    P31-8(RCL+) - P35-2
    		Always
    		Below 1 Ω
    P31-10(RCL-) - P35-1
    		Always
    		Below 1 Ω
    P31-2(SLD+) - Body ground
    		Always
    		10 kΩ or higher
    P31-3(SLD-) - Body ground
    		Always
    		10 kΩ or higher
    P31-4(FRV-) - Body ground
    		Always
    		10 kΩ or higher
    P31-6(FRV+) - Body ground
    		Always
    		10 kΩ or higher
    P31-7(LFT+) - Body ground
    		Always
    		10 kΩ or higher
    P31-9(LFT-) - Body ground
    		Always
    		10 kΩ or higher
    P31-8(RCL+) - Body ground
    		Always
    		10 kΩ or higher
    P31-10(RCL-) - Body ground
    		Always
    		10 kΩ or higher
    RHD:
    Tester Connection
    		Condition
    		Specified Condition
    P31-2(SLD+) - P36-2
    		Always
    		Below 1 Ω
    P31-3(SLD-) - P36-1
    		Always
    		Below 1 Ω
    P31-4(FRV-) - P32-1
    		Always
    		Below 1 Ω
    P31-6(FRV+) - P32-2
    		Always
    		Below 1 Ω
    P31-7(LFT+) - P33-1
    		Always
    		Below 1 Ω
    P31-9(LFT-) - P33-2
    		Always
    		Below 1 Ω
    P31-8(RCL+) - P35-2
    		Always
    		Below 1 Ω
    P31-10(RCL-) - P35-1
    		Always
    		Below 1 Ω
    P31-2(SLD+) - Body ground
    		Always
    		10 kΩ or higher
    P31-3(SLD-) - Body ground
    		Always
    		10 kΩ or higher
    P31-4(FRV-) - Body ground
    		Always
    		10 kΩ or higher
    P31-6(FRV+) - Body ground
    		Always
    		10 kΩ or higher
    P31-7(LFT+) - Body ground
    		Always
    		10 kΩ or higher
    P31-9(LFT-) - Body ground
    		Always
    		10 kΩ or higher
    P31-8(RCL+) - Body ground
    		Always
    		10 kΩ or higher
    P31-10(RCL-) - Body ground
    		Always
    		10 kΩ or higher



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE