SEAT HEATER SYSTEM Seat Heater for Rear Left Seat does not Operate

DESCRIPTION

When the rear control switch is operated, the air conditioning amplifier assembly receives the signal. The rear control switch sends the signal to the air conditioning amplifier assembly through LIN communication.

The air conditioning amplifier assembly receives the signal and operates the seat heater.

WIRING DIAGRAM

B002CR6E02

CAUTION / NOTICE / HINT

Note


  • If the battery voltage is low, the seat heater system may not operate. When "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection for the charging system.

    Click here

  • If the battery voltage is low, the seat heater system may not operate. When "Operation of Electrical Items Restricted." is not displayed on the multi-information display in the combination meter assembly, check the Data List item "Battery Control Count (Body ECU)".

    Click here

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

PROCEDURE


  1. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      Result
      Result Proceed to
      DTC B14B3 and B14C3 is not output A
      DTC B14B3 is output B
      DTC B14C3 is output C

    B

    GO TO DTC B14B3 Click here

    C

    GO TO DTC B14C3 Click here

    A

  2. INSPECT BENCH TYPE REAR SEAT CUSHION COVER


    1. Remove the bench type rear seat cushion cover.

      Click here

    2. Inspect the bench type rear seat cushion cover.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BENCH TYPE REAR SEAT CUSHION COVER Click here

    OK

  3. INSPECT BENCH TYPE REAR SEATBACK COVER


    1. Remove the bench type rear seatback cover.

      Click here

    2. Inspect the bench type rear seatback cover.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BENCH TYPE REAR SEATBACK COVER Click here

    OK

  4. CHECK HARNESS AND CONNECTOR (BENCH TYPE REAR SEATBACK COVER - BATTERY AND BODY GROUND)


    1. B002EHPC76
      *a

      Front view of wire harness connector

      (to Bench Type Rear Seatback Cover)

      Disconnect the bench type rear seatback cover connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      h2-1 (B) - Body ground Engine switch on (IG) 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      h2-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BENCH TYPE REAR SEATBACK COVER)


    1. Disconnect the K64 air conditioning amplifier assembly connector.

    2. Disconnect the h2 bench type rear seatback cover connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K64-31 (SHDE) - h2-4 (SHDE) Always Below 1 Ω
      K64-31 (SHDE) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - BENCH TYPE REAR SEAT CUSHION COVER)


    1. Disconnect the K65 air conditioning amplifier assembly connector.

    2. Disconnect the h4 bench type rear seat cushion cover connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K65-17 (TFAL) - h4-1 (TFAL) Always Below 1 Ω
      K65-31 (SG) - h4-4 (SG) Always Below 1 Ω
      K65-17 (TFAL) - Body ground Always 10 kΩ or higher
      K65-31 (SG) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (BENCH TYPE REAR SEAT CUSHION COVER - BENCH TYPE REAR SEATBACK COVER AND BODY GROUND)


    1. Disconnect the h4 bench type rear seat cushion cover connector.

    2. Disconnect the h2 bench type rear seatback cover connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      h4-2 (AL) - h2-2 (AL) Always Below 1 Ω
      h4-3 (GND) - h2-3 (GND) Always Below 1 Ω
      h4-2 (AL) - Body ground Always 10 kΩ or higher
      h4-3 (GND) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY (LH SIDE)


    1. Temporarily replace the seat heater control sub-assembly (LH side) with a new or normally functioning one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  9. CHECK SEAT HEATER SYSTEM


    1. Check the seat heater system.

      Click here

      OK
      Seat heater operates normally
      Result
      Proceed to
      OK
      NG

    OK

    END (SEAT HEATER CONTROL SUB-ASSEMBLY (LH SIDE) WAS DEFECTIVE)

    NG

  10. REPLACE REAR CONTROL SWITCH


    1. Temporarily replace the rear control switch with a new or normally functioning one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  11. CHECK SEAT HEATER OPERATION


    1. Check the seat heater system.

      Click here

      OK
      Seat heater system operates normally
      Result
      Proceed to
      OK
      NG

    OK

    END (REAR CONTROL SWITCH WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here