SEAT HEATER SYSTEM Seat Heater for Rear Right 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

B004S6WE04
B004V9WE06

CAUTION / NOTICE / HINT

Note


  • If the auxiliary 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 auxiliary 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 auxiliary 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 RH - BATTERY) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

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


    1. Disconnect the R8 seat heater control sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R8-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      R8-1 (+B1) - Body ground Power switch off 11 to 14 V
      R8-8 (+B2) - Body ground Power switch off 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 RH


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

      Click here

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

      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 RH


    1. Remove the separate type rear seatback cover RH.

      Click here

    2. Inspect the separate type rear seatback cover RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE REAR SEATBACK COVER RH Click here

    OK

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


    1. Disconnect the R8 seat heater control sub-assembly RH connector.

    2. Disconnect the T2 separate type rear seat cushion cover RH connector.

    3. Disconnect the R9 separate type rear seatback cover RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R9-12 - R8-10 (E) Always Below 1 Ω
      R9-12 or R8-10 (E) - Other terminals and body ground Always 10 kΩ or higher
      T2-1 - R8-7 (Heater Output 1) Always Below 1 Ω
      T2-1 or R8-7 (Heater Output 1) - Other terminals and body ground Always 10 kΩ or higher
      R9-7 - R8-12 (Heater Output 2) Always Below 1 Ω
      R9-7 or R8-12 (Heater Output 2) - Other terminals and body ground Always 10 kΩ or higher
      R9-6 - Body ground Always Below 1 Ω
      T2-2 - 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 RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the T2 separate type rear seat cushion cover RH connector.

    2. Disconnect the G63 and G64 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
      T2-3 - G64-23 (TFAR) Always Below 1 Ω
      T2-3 or G64-23 (TFAR) - Other terminals and body ground Always 10 kΩ or higher
      T2-4 - G63-9 (SG-6) Always Below 1 Ω
      T2-4 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 RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the R8 seat heater control sub-assembly RH 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
      R8-4 (PWM) - G63-13 (SHPE) Always Below 1 Ω
      R8-4 (PWM) or G63-13 (SHPE) - 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 RH


    1. Temporarily replace the seat heater control sub-assembly RH 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 RH - BATTERY)


    1. Disconnect the R26 seat heater control sub-assembly RH connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      R26-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
      Power switch off Below 1 V
      R26-1 (+B1) - Body ground Power switch off 11 to 14 V
      R26-8 (+B2) - Body ground Power switch off 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 RH


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

      Click here

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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE BENCHTE TYPE REAR SEAT CUSHION COVER RH Click here

    OK

  13. INSPECT SEPARATE TYPE REAR SEATBACK COVER RH


    1. Remove the separate type rear seatback cover RH.

      Click here

    2. Inspect the separate type rear seatback cover RH.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE SEPARATE TYPE REAR SEATBACK COVER RH Click here

    OK

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


    1. Disconnect the R26 seat heater control sub-assembly RH connector.

    2. Disconnect the R27 bench type rear seat cushion cover RH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R27-12 - R26-10 (E) Always Below 1 Ω
      R27-12 or R26-10 (E) - Other terminals and body ground Always 10 kΩ or higher
      R27-1 - R26-7 (Heater Output 1) Always Below 1 Ω
      R27-1 or R26-7 (Heater Output 1) - Other terminals and body ground Always 10 kΩ or higher
      R27-7 - R26-12 (Heater Output 2) Always Below 1 Ω
      R27-7 or R26-12 (Heater Output 2) - Other terminals and body ground Always 10 kΩ or higher
      R27-6 - 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 RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the R27 bench type rear seat cushion cover RH connector.

    2. Disconnect the G63 and G64 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R27-9 - G64-23 (TFAR) Always Below 1 Ω
      R27-9 or G64-23 (TFAR) - Other terminals and body ground Always 10 kΩ or higher
      R27-3 - G63-9 (SG-6) Always Below 1 Ω
      R27-3 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 RH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the R26 seat heater control sub-assembly RH 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
      R26-4 (PWM) - G63-13 (SHPE) Always Below 1 Ω
      R26-4 (PWM) or G63-13 (SHPE) - 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 RH


    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