SEAT HEATER SYSTEM Driver Side Seat Heater does not Operate

DESCRIPTION

When the refreshing seat switch LH 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

A01WSQME22
A01WPCZE05

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*1 A
      DTC B14C0 is not output*2 B
      DTC B14C1*1 or B14C0*2 is output C

      • *1: for LHD

      • *2: for RHD


    B

    INSPECT INSPECT REFRESHING SEAT SWITCH RH Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

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

    A01WQ5SE01
    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 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. A01WQ6GE01
      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 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
      c13-2 (PL) - SHL-3 (TH2) Always Below 1 Ω
      c13-5 (THL) or SHL-2 (TH1) - Body ground Always 10k Ω or higher
      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 (AIR CONDITIONING AMPLIFIER ASSEMBLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)


    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
      E35-19 (TSL) - c13-5 (THL) Always Below 1 Ω
      E35-34 (SG-4) - c13-2 (PL) Always Below 1 Ω
      E36-16 (SHD+) or c13-1 (SWL) - Body ground Always 10 kΩ or higher
      E35-19 (TSL) or c13-5 (THL) - Body ground Always 10 kΩ or higher
      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 LH Click here

  9. INSPECT INSPECT REFRESHING SEAT SWITCH RH


    1. Remove the refreshing seat switch RH Click here.

    2. Inspect the refreshing seat switch RH Click here.


    NG

    REPLACE REFRESHING SEAT SWITCH RH Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (REFRESHING SEAT SWITCH RH - REFRESHINGSEAT SWITCH LH)


    1. Disconnect the V10 refreshing seat switch RH connector.

    2. Disconnect the V8 refreshing seat switch LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      V10-16 (SWH) - V8-16 (SWH) Always Below 1 Ω
      V10-2 (E) - V8-2 (E) Always Below 1 Ω
      V10-16 (SWH) or V8-16 (SWH) - Body ground Always 10 kΩ or higher
      V10-2 (E) or V8-2 (E) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    A01WVYLE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Seat Heater Control Sub-assembly RH)

    1. Disconnect the seat heater control sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c1-4 (B1) - Body ground Engine switch on (IG) 11 to 14 V
      c1-4 (B1) - Body ground Engine switch off Below 1 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      c1-6 (E) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT SEAT HEATER CONTROL SUB-ASSEMBLY RH


    1. A01WSAPE01
      Text in Illustration
      *a

      Seat Heater Control Sub-assembly RH

      (to Air Conditioning Amplifier Assembly)
      *b

      Seat Heater Control Sub-assembly RH

      (to Front Seat Cushion Heater Assembly RH)

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      c1-5 (THR) - SHL- 2 (TH1) Always Below 1 Ω
      c1-2 (PR) - SHL-3 (TH2) Always Below 1 Ω
      c1-5 (THR) or SHL-2 (TH1) - Body ground Always 10k Ω or higher
      c1-2 (PR) or SHL- 3 (TH2) - Body ground Always 10k Ω or higher

    NG

    REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY RH Click here

    OK

  13. INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY RH


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

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


    NG

    REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY RH Click here

    OK

  14. INSPECT FRONT SEATBACK HEATER ASSEMBLY RH


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

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


    NG

    REPLACE FRONT SEATBACK HEATER ASSEMBLY RH Click here

    OK

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


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

    2. Disconnect the c1 seat heater control sub-assembly RH connector

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E36-15 (SHP+) - c1-1(SWR) Always Below 1 Ω
      E35-20 (TSR) - c1-5 (THR) Always Below 1 Ω
      E35-34 (SG-4) - c1-2 (PR) Always Below 1 Ω
      E36-15 (SHP+) or c1-1(SWR) - Body ground Always 10 kΩ or higher
      E35-20 (TSR) or c1-5 (THR) - Body ground Always 10 kΩ or higher
      E35-34 (SG-4) or c1-2 (PR) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK SEAT HEATER CONTROL SUB-ASSEMBLY RH


    1. Replace the seat heater control sub-assembly RH 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 RH WAS DEFECTIVE)

    NG

  17. CHECK AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. Replace the air conditioning amplifier assembly 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 LH Click here