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

DESCRIPTION

When the refreshing seat switch is operated, the air conditioning amplifier assembly receives the signal. The air conditioning amplifier assembly receives the signal and operates the front seat heater.

WIRING DIAGRAM

B001ZN0E21

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 FOR DTC


    1. Clear the DTCs Click here.

    2. Check for DTCs Click here.

      Result
      Result Proceed to
      DTC B14C1 is not output A
      DTC B14C1 is output B

    B

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

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

    B001WWKE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Seat Heater Control Sub-assembly LH)

    1. 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
      c13-4 (B) - Body ground Engine switch on (IG) 11 to 14 V
      c13-4 (B) - Body ground Engine switch off (IG) Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      c13-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. B001WQSE01
      Text in Illustration
      *a

      Seat Heater Control Sub-assembly LH

      (to Air Conditioning Amplifier Assembly)
      *b

      Seat Heater Control Sub-assembly LH

      (to Front Seat Cushion Heater Assembly LH)

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c13-5 (THL) - SHL-2 (TH1) Always Below 1 Ω
      c13-5 (THL) or SHL-2 (TH1) - Body ground Always 10k Ω or higher
      c13-2 (PL) - SHL-3 (TH2) Always Below 1 Ω
      c13-2 (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 FRONT SEAT CUSHION HEATER ASSEMBLY LH


    1. Remove the front seat cushion heater assembly LH Click here.

    2. Inspect the front seat cushion heater assembly LH Click here.


    NG

    REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH Click here

    OK

  5. INSPECT FRONT SEATBACK HEATER ASSEMBLY LH


    1. Remove the front seatback heater assembly LH Click here.

    2. Inspect the front seatback heater assembly LH Click here.


    NG

    REPLACE FRONT SEATBACK HEATER ASSEMBLY LH Click here

    OK

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


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

    2. Disconnect the c13 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
      E36-16 (SHD+) - c13-1 (SWL) Always Below 1 Ω
      E36-16 (SHD+) or c13-1 (SWL) - Body ground Always 10 kΩ or higher
      E35-19 (TSL) - c13-5 (THL) Always Below 1 Ω
      E35-19 (TSL) or c13-5 (THL) - Body ground Always 10 kΩ or higher
      E35-34 (SG-4) - c13-2 (PL) Always Below 1 Ω
      E35-34 (SG-4) or c13-2 (PL) - Body ground Always 10 kΩ 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 front seat heater system is operated normally.

      OK
      The front 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 front seat heater system is operated normally.

      OK
      The front seat heater operates normally.

    OK

    END (AIR CONDITIONING AMPLIFIER ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE REFRESHING SEAT SWITCH Click here