REAR POWER SEAT CONTROL SYSTEM(for Second Row) Fold Seat Switch Circuit

DESCRIPTION

When the fold seat switch assembly is operated, a switch operation signal is sent to the fold seat control ECU. According to the signal received, the fold seat control ECU operates the fold motor to operate the fold or return function of the rear seatback.

WIRING DIAGRAM

PROCEDURE

1. CHECK FOLD SEAT CONTROL ECU

   
   
   1. 

      *A	for Rear RH Seat
      *B	for Rear LH Seat
      *a	Component with harness connected (Fold Seat Control ECU)

      Check the fold seat control ECU.

      
      

      1. Remove the fold seat control ECU with its connectors still connected.

         
         

         • for Rear LH Seat: Click here

         • for Rear RH Seat: Click here

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

         Standard Voltage
         for Rear RH Seat Tester Connection Condition Specified Condition x3-26 (FOLD) - Body ground Fold seat switch (for Rear RH Seat) off → on (fold) 11 to 14 V → Below 1 V x3-25 (RTRN) - Body ground Fold seat switch (for Rear RH Seat) off → on (return) 11 to 14 V → Below 1 V
         for Rear LH Seat Tester Connection Condition Specified Condition y3-26 (FOLD) - Body ground Fold seat switch (for Rear LH Seat) off → on (fold) 11 to 14 V → Below 1 V y3-25 (RTRN) - Body ground Fold seat switch (for Rear LH Seat) off → on (return) 11 to 14 V → Below 1 V

         Result
         Proceed to OK NG

   
   

   OK

   GO TO PROBLEM SYMPTOMS TABLE Click here

   NG

2. INSPECT FOLD SEAT SWITCH ASSEMBLY

   
   

   1. Remove the fold seat switch assembly.

      Click here

   2. Inspect the fold seat switch assembly.

      Click here

      Result
      Result OK NG

   
   

   NG

   REPLACE FOLD SEAT SWITCH ASSEMBLY Click here

   OK

3. CHECK HARNESS AND CONNECTOR (FOLD SEAT SWITCH ASSEMBLY - FOLD SEAT CONTROL ECU AND BODY GROUND)

   
   

   1. Disconnect the R31 fold seat switch assembly connector.

   2. Disconnect the x3*1 or y3*2 fold seat control ECU connector.

      
      

      • *1: for Rear RH Seat

      • *2: for Rear LH Seat

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

      Standard Resistance
      for Rear RH Seat Tester Connection Condition Specified Condition R31-6 (FOLD) - x3-26 (FOLD) Always Below 1 Ω R31-6 (FOLD) or x3-26 (FOLD) - Body ground Always 10 kΩ or higher R31-1 (RTRN) - x3-25 (RTRN) Always Below 1 Ω R31-1 (RTRN) or x3-25 (RTRN) - Body ground Always 10 kΩ or higher R31-7 (E) - Body ground Always Below 1 Ω
      for Rear LH Seat Tester Connection Condition Specified Condition R31-8 (FOLD) - y3-26 (FOLD) Always Below 1 Ω R31-8 (FOLD) or y3-26 (FOLD) - Body ground Always 10 kΩ or higher R31-3 (RTRN) - y3-25 (RTRN) Always Below 1 Ω R31-3 (RTRN) or y3-25 (RTRN) - Body ground Always 10 kΩ or higher R31-7 (E) - Body ground Always Below 1 Ω

      Result
      Result OK NG

   
   

   OK

   REPLACE FOLD SEAT CONTROL ECU for Rear LH Seat: Click here REPLACE FOLD SEAT CONTROL ECU for Rear RH Seat: Click here

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR