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

DESCRIPTION

When the cooler control switch assembly is operated, the air conditioning amplifier assembly receives the signal. The air conditioning amplifier assembly receives the signal and operates the rear seat heater.

WIRING DIAGRAM

A01WSQME25

CAUTION / NOTICE / HINT

Note


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

  • First perform the communication function inspections in How to Proceed with Troubleshooting to confirm that there are no LIN communication malfunctions before troubleshooting this symptom.

PROCEDURE


  1. CHECK DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B14C3 is not output A
      DTC B14C3 is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  2. CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH -BATTERY AND BODY GROUND)


    1. A01WUSME01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Seat Heater Control Sub-assembly LH)

      Disconnect the seat heater control sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      d2-4 (B) - Body ground Engine switch on (IG) 11 to 14 V
      d2-4 (B) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      d2-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. A01WPNBE01
      Text in Illustration
      *a

      Seat Heater Control Sub-assembly LH

      (to Air Conditioning Amplifier Assembly)
      *b

      Seat Heater Control Sub-assembly LH

      (to Seat Heater Assembly [Rear Seat Cushion Heater LH])

      Remove the seat heater control sub-assembly LH Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      d2-5 (THL) - SHL-2 (TH1) Always Below 1 Ω
      d2-2 (PL) - SHL-3 (TH2) Always Below 1 Ω
      d21-5 (THL) or SHL-2 (TH1) - Body ground Always 10k Ω or higher
      d2-2 (PL) or SHL-3 (TH2) - Body ground Always 10k Ω or higher

    NG

    REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH Click here

    OK

  4. INSPECT SEAT HEATER ASSEMBLY (REAR SEAT CUSHION HEATER LH)


    1. Remove the seat heater assembly (rear seat cushion heater LH) Click here.

    2. Inspect the seat heater assembly (rear seat cushion heater LH) Click here.


    NG

    REPLACE SEAT HEATER ASSEMBLY (REARSEAT CUSHION HEATER LH) Click here

    OK

  5. INSPECT SEAT HEATER ASSEMBLY (REAR SEATBACK HEATER LH)


    1. Remove the seat heater assembly (rear seatback heater LH) Click here.

    2. Inspect the seat heater assembly (rear seatback heater LH) Click here.


    NG

    REPLACE SEAT HEATER ASSEMBLY (REAR SEATBACK HEATER LH) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY -SEAT HEATER CONTROL SUB-ASSEMBLY LH)


    1. Disconnect the E35 and E36 air conditioning amplifier assembly connectors.

    2. Disconnect the d2 seat heater control sub-assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E36-35 (SHDE) - d2-1 (SWL) Always Below 1 Ω
      E35-26 (TFAL) - d2-5 (THL) Always Below 1 Ω
      E35-35 (SG) - d2-2 (PL) Always Below 1 Ω
      E36-35 (SHDE) or d2-1 (SWL) - Body ground Always 10k Ω or higher
      E35-26 (TFAL) or d2-5 (THL) - Body ground Always 10k Ω or higher
      E35-35 (SG) or d2-2 (PL) - Body ground Always 10k Ω or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. Replace the seat heater control sub-assembly LH with a new or known good one Click here.

    2. Check that the rear seat heater system is operated normally.

      OK
      The rear seat heater operates normally.

    OK

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

    NG

  8. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly with a new or known good one Click here.

    2. Check that the rear seat heater system is operated normally.

      OK
      The rear seat heater operates normally.

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE COOLER CONTROL SWITCH ASSEMBLY Click here