FRONT POWER SEAT CONTROL SYSTEM Front Passenger Side Power Seat Motor Circuit

DESCRIPTION

When the power seat control switch is operated, a command signal is sent to the front power seat switch (position control ECU). The front power seat switch (position control ECU) 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 front power seat switch (position control ECU) is designed so that any malfunction of the seat memory system will not interfere with manual seat control.

If the front power seat switch (position control 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. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (FRONT POWER SEAT SWITCH (POSITION CONTROL ECU))

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the engine switch on (IG).

   3. Turn the tester on.

   4. Perform the Active Test by following the directions on the tester screen.

      Seat
      Tester Display Test Part Control Range Diagnostic Note Seat Reclining Seat reclining operation FRONT/REAR - Front Vertical Operation Seat front vertical operation UP/DOWN - Lifter Operation Seat lifter operation UP/DOWN - Seat Slide Operation Seat sliding operation FRONT/REAR -

      OK
      Each power seat motor operates.

   
   

   NG

   INSPECT FRONT SEAT ASSEMBLY (POWER SEAT MOTOR) Click here

   OK

   PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE Click here

2. INSPECT FRONT SEAT ASSEMBLY (POWER SEAT MOTOR)

   
   

   1. Inspect the power seat motor Click here.

      Result
      Result Proceed to Power seat motor operates OK Power seat motor does not operate NG

   
   

   NG

   REPLACE FRONT SEAT ASSEMBLY (POWER SEAT MOTOR) Click here

   OK

3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH - POWER SEAT MOTOR)

   
   

   1. 

      for LHD:

      
      

      1. Disconnect the front power seat switch RH (position control ECU) connector and power seat motor connectors.

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

         Standard Resistance

         Tester Connection Condition Specified Condition T6-2 (SLD+) - T1-2 Always Below 1 Ω T6-3 (SLD-) - T1-1 Always Below 1 Ω T6-4 (FRV-) - T4-1 Always Below 1 Ω T6-6 (FRV+) - T4-2 Always Below 1 Ω T6-7 (LFT+) - T5-1 Always Below 1 Ω T6-9 (LFT-) - T5-2 Always Below 1 Ω T6-8 (RCL+) - T9-2 Always Below 1 Ω T6-10 (RCL-) - T9-1 Always Below 1 Ω T6-2 (SLD+) - Body ground Always 10 kΩ or higher T6-3 (SLD-) - Body ground Always 10 kΩ or higher T6-4 (FRV-) - Body ground Always 10 kΩ or higher T6-6 (FRV+) - Body ground Always 10 kΩ or higher T6-7 (LFT+) - Body ground Always 10 kΩ or higher T6-9 (LFT-) - Body ground Always 10 kΩ or higher T6-8 (RCL+) - Body ground Always 10 kΩ or higher T6-10 (RCL-) - Body ground Always 10 kΩ or higher

   2. 

      for RHD:

      
      

      1. Disconnect the front power seat switch LH (position control ECU) connector and power seat motor connectors.

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

         Standard Resistance

         Tester Connection Condition Specified Condition U6-2 (SLD+) - U2-1 Always Below 1 Ω U6-3 (SLD-) - U2-2 Always Below 1 Ω U6-4 (FRV-) - U8-2 Always Below 1 Ω U6-6 (FRV+) - U8-1 Always Below 1 Ω U6-7 (LFT+) - U9-2 Always Below 1 Ω U6-9 (LFT-) - U9-1 Always Below 1 Ω U6-8 (RCL+) - U5-2 Always Below 1 Ω U6-10 (RCL-) - U5-1 Always Below 1 Ω U6-2 (SLD+) - Body ground Always 10 kΩ or higher U6-3 (SLD-) - Body ground Always 10 kΩ or higher U6-4 (FRV-) - Body ground Always 10 kΩ or higher U6-6 (FRV+) - Body ground Always 10 kΩ or higher U6-7 (LFT+) - Body ground Always 10 kΩ or higher U6-9 (LFT-) - Body ground Always 10 kΩ or higher U6-8 (RCL+) - Body ground Always 10 kΩ or higher U6-10 (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 Click here