REAR POWER SEAT CONTROL SYSTEM Park / Neutral Position Switch Circuit

DESCRIPTION

The fold seat control ECU receives switch operation signals, back door open/close signal*1, rear door open/close signal*2 and driving condition signal (shift position, stop light switch assembly, parking brake signals) from the main body ECU (multiplex network body ECU). Then, the fold seat control ECU actives the rear seat according these signals.


WIRING DIAGRAM

B0059RME02
*1 SFTP
*2 Main Body ECU (Multiplex Network Body ECU)
*3 Fold Seat Control ECU (Rear Right Seat)
*4 Fold Seat Control ECU (Rear Left Seat)

CAUTION / NOTICE / HINT

Note


  • If the main body ECU (multiplex network body ECU) is replaced, refer to the Service Bulletin.

  • As the door control battery is installed between the vehicle battery and main body ECU (multiplex network body ECU), first perform the inspections in On-Vehicle Inspection to confirm that there are no malfunctions in the power source circuit for the main body ECU (multiplex network body ECU) before performing this troubleshooting procedure.*

    *: w/ Rear Pretensioner

    Click here

PROCEDURE


  1. CHECK FOLD SEAT CONTROL ECU (PARK/NEUTRAL POSITION SWITCH SIGNAL)

    B0058RMC04
    *A Rear Right Seat
    *B Rear Left Seat
    *a

    Component with harness connected

    (Fold Seat Control ECU)

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

      Click here

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

      Standard Voltage
      Rear Right Seat
      Tester Connection Condition Specified Condition
      h3-17 (P) - Body ground

      • Engine switch on (IG), shift lever is P → other than P

      • Engine switch on (IG), stop light switch assembly on → off

      • Engine switch on (IG), parking brake applied → released

      		 11 to 14 V → Below 1 V
      Engine switch off 11 to 14 V
      Rear Left Seat
      Tester Connection Condition Specified Condition
      i3-17 (P) - Body ground

      • Engine switch on (IG), shift lever is P → other than P

      • Engine switch on (IG), stop light switch assembly on → off

      • Engine switch on (IG), parking brake applied → released

      		 11 to 14 V → Below 1 V
      Engine switch off 11 to 14 V
      Result
      Result
      OK
      NG

    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (FOLD SEAT CONTROL ECU - MAIN BODY ECU [MULTIPLEX NETWORK BODY ECU])


    1. Disconnect the h3*1 or i3*2 fold seat control ECU connectors.


      • *1: Rear Right Seat

      • *2: Rear Left Seat

    2. Disconnect the I47 main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Rear Right Seat
      Tester Connection Condition Specified Condition
      h3-17 (P) - I47-16 (SFTP) Always Below 1 Ω
      h3-17 (P) or I47-16 (SFTP) - Body ground Always 10 kΩ or higher
      Rear Left Seat
      Tester Connection Condition Specified Condition
      i3-17 (P) - I47-16 (SFTP) Always Below 1 Ω
      i3-17 (P) or I47-16 (SFTP) - Body ground Always 10 kΩ or higher
      Result
      Result
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK FOLD SEAT CONTROL ECU


    1. Replace the fold seat control ECU with a new or normally functioning one.

      Click here

    2. Check the rear power seat control system.

      Click here

      OK
      The rear power seat control system is operated normally.
      Result
      Proceed to
      OK
      NG

    OK

    END (FOLD SEAT CONTROL ECU WAS DEFECTIVE)

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here for RHD: Click here