FRONT POWER SEAT CONTROL SYSTEM(w/ Memory) Front Power Seat does not Operate with Front Power Seat Switch

DESCRIPTION

Signals are input into the front power seat switch LH. The built-in ECU manages the signals received from the power seat switch, and operates each motor. If the front power seat switch LH receives more than 2 motor operation signals, the motor is stopped. Manual operation is restarted after the front power seat switch LH receives 1 signal only.

WIRING DIAGRAM

A01MJLVE34
A01MJLVE35

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK FRONT POWER SEAT OPERATION


    1. Check that each function of the power seat operates normally by using the front power seat switch LH.

      Click here

      Result
      Result Proceed to
      All power seat functions do not operate (for LHD) A
      All power seat functions do not operate (for RHD) B
      One or more power seat functions do not operate C

    B

    CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SUPPLY) Click here

    C

    GO TO OTHER DIAGNOSIS PROCEDURE (One or more Power Seat Motors do not Operate) Click here

    A

  2. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - POWER SUPPLY)


    1. A01MH8ZC12
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch LH)

      Disconnect the front power seat switch LH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      a9-7 (+B) - Body ground Power switch off 11 to 14 V
      a10-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      a10-3 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH LH - BODY GROUND)


    1. A01MI7ZC02
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch LH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      a9-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH LH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

  4. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - POWER SUPPLY)


    1. A01MH8ZC14
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch RH)

      Disconnect the front power seat switch RH connectors.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Z4-7 (+B) - Body ground Power switch off 11 to 14 V
      Z5-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Z5-3 (IG) - Body ground Power switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (FRONT POWER SEAT SWITCH RH - BODY GROUND)


    1. A01MI7ZC03
      *a

      Front view of wire harness connector

      (to Front Power Seat Switch RH)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Z4-2 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE FRONT POWER SEAT SWITCH RH Click here

    NG

    REPAIR OR REPLACE HARNESS AND CONNECTOR