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

DESCRIPTION

When the rear seat heater switch is operated, the air conditioning amplifier assembly receives the signal via CAN*1 or LIN*2 communication line. The air conditioning amplifier assembly receives the signal and operates the rear seat heater.

*1: w/ Rear Power Seat

*2: w/o Rear Power Seat

WIRING DIAGRAM

B006ANAE07
B006E0WE06

CAUTION / NOTICE / HINT

Note


  • If the battery voltage is low, the seat heater system may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" 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

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

Tech Tips

If the battery voltage is low, the seat heater system may not operate. When "High Power Consumption Partial Limit On AC/Heater Operation" 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

PROCEDURE


  1. CLEAR DTC


    1. Clear the DTCs.

      Click here


      Body Electrical > Air Conditioner > Clear DTCs
      Result
      Proceed to
      NEXT

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.

      Click here


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTCs are not output
      Result
      Result Proceed to
      OK (w/ rear power seat) A
      OK (w/o rear power seat) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - BATTERY) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - BATTERY)


    1. Disconnect the R43 seat heater control sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R43-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      R43-1 (+B1) - Body ground Always 11 to 14 V
      R43-8 (+B2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT SEPARATE TYPE REAR SEAT CUSHION COVER LH


    1. Remove the separate type rear seat cushion cover LH.

      Click here

    2. Inspect the separate type rear seat cushion cover LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE REAR SEAT CUSHION COVER RH Click here

    OK

  5. INSPECT SEPARATE TYPE REAR SEATBACK COVER LH


    1. Remove the separate type rear seatback cover LH.

      Click here

    2. Inspect the separate type rear seatback cover LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE REAR SEATBACK COVER LH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - SEPARATE TYPE REAR SEAT CUSHION COVER AND SEPARATE TYPE REAR SEAT BACKCOVER LH)


    1. Disconnect the T9 separate type rear seat cushion cover LH connector.

    2. Disconnect the R43 seat heater control sub-assembly LH connector.

    3. Disconnect the R42 separate type rear seatback cover LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R42-12 - R43-10 (E) Always Below 1 Ω
      R42-12 or R43-10 (E) - Other terminals and body ground Always 10 kΩ or higher
      T9-1 - R43-7 (Heater Output 1) Always Below 1 Ω
      T9-1 or R43-7 (Heater Output 1) - Other terminals and body ground Always 10 kΩ or higher
      R42-7 - R43-12 (Heater Output 2) Always Below 1 Ω
      R42-7 or R43-12 (Heater Output 2) - Other terminals and body ground Always 10 kΩ or higher
      R42-5 - Body ground Always Below 1 Ω
      T9-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  7. CHECK HARNESS AND CONNECTOR (SEPARATE TYPE REAR SEAT CUSHION COVER LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the T9 separate type rear seat cushion cover LH connector.

    2. Disconnect the G63 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      T9-3 - G63-19 (TFAL) Always Below 1 Ω
      T9-3 or G63-19 (TFAL) - Other terminals and body ground Always 10 kΩ or higher
      T9-4 - G63-9 (SG-6) Always Below 1 Ω
      T9-4 or G63-9 (SG-6) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the R43 seat heater control sub-assembly LH connector.

    2. Disconnect the G63 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R43-4 (PWM) - G63-25 (SHDE) Always Below 1 Ω
      R43-4 (PWM) or G63-25 (SHDE) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. Temporarily replace the seat heater control sub-assembly LH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  10. CHECK SEAT HEATER OPERATION


    1. Check the seat heater.

      Click here

      OK
      The seat heater operates normally.
      Result
      Proceed to
      OK
      NG

    OK

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

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  11. CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - BATTERY)


    1. Disconnect the R61 seat heater control sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R61-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      Engine switch off Below 1 V
      R61-1 (+B1) - Body ground Always 11 to 14 V
      R61-8 (+B2) - Body ground Always 11 to 14 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. INSPECT BENCHTE TYPE REAR SEAT CUSHION COVER LH


    1. Remove the bench type rear seat cushion cover LH.

      Click here

    2. Inspect the bench type rear seat cushion cover LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BENCHTE TYPE REAR SEAT CUSHION COVER LH Click here

    OK

  13. INSPECT SEPARATE TYPE REAR SEATBACK COVER LH


    1. Remove the separate type rear seatback cover LH.

      Click here

    2. Inspect the separate type rear seatback cover LH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE REAR SEATBACK COVER LH Click here

    OK

  14. CHECK HARNESS AND CONNECTOR (SEAT HEATER CONTROL SUB-ASSEMBLY LH - BENCH TYPE REAR SEAT CUSHION COVER LH AND BODY GROUND)


    1. Disconnect the R61 seat heater control sub-assembly LH connector.

    2. Disconnect the R62 bench type rear seat cushion cover LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R62-12 - R61-10 (E) Always Below 1 Ω
      R62-12 or R61-10 (E) - Other terminals and body ground Always 10 kΩ or higher
      R62-1 - R61-7 (Heater Output 1) Always Below 1 Ω
      R62-1 or R61-7 (Heater Output 1) - Other terminals and body ground Always 10 kΩ or higher
      R62-7 - R61-12 (Heater Output 2) Always Below 1 Ω
      R62-7 or R61-12 (Heater Output 2) - Other terminals and body ground Always 10 kΩ or higher
      R62-6 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the R62 bench type rear seat cushion cover LH connector.

    2. Disconnect the G63 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R62-9 - G63-19 (TFAL) Always Below 1 Ω
      R62-9 or G63-19 (TFAL) - Other terminals and body ground Always 10 kΩ or higher
      R62-3 - G63-9 (SG-6) Always Below 1 Ω
      R62-3 or G63-9 (SG-6) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the R61 seat heater control sub-assembly LH connector.

    2. Disconnect the G63 air conditioning amplifier assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R61-4 (PWM) - G63-25 (SHDE) Always Below 1 Ω
      R61-4 (PWM) or G63-25 (SHDE) - Other terminals and body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  17. REPLACE SEAT HEATER CONTROL SUB-ASSEMBLY LH


    1. Temporarily replace the seat heater control sub-assembly RH with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

    GO TO STEP 10 Click here