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

DESCRIPTION

When the refreshing seat switch (for front side) is operated, the air conditioning amplifier assembly receives the signal and operates the seat heater for the corresponding front seat.

WIRING DIAGRAM

B005MMUE14

CAUTION / NOTICE / HINT

Note


  • If the battery voltage is low, the seat heater system may not operate. If "Operation of Electrical Items Restricted." is displayed on the multi-information display in the combination meter assembly, inspect the battery, referring to On-vehicle Inspection of Charging System.

    Click here

  • If the battery voltage is low, the seat heater system may not operate. If "Operation of Electrical Items Restricted." 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

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

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
      DTC B14B5 or B14C1 is not output.
      Result
      Result Proceed to
      OK (for Standard Seat Type) A
      OK (for Sports Seat Type) B
      NG C

    B

    CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - FRONT SEAT CUSHION HEATER (FRONT SEAT CUSHION PAD WITH COVER LH) - BODY GROUND) Click here

    C

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    A

  3. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - FRONT SEAT CUSHION HEATER (SEPARATE TYPE FRONT SEAT CUSHION COVER (FOR LH SIDE)) - BODY GROUND)


    1. B005NUGC13
      *a

      Front view of wire harness connector

      (to Front Seat Cushion Heater (Separate Type Front Seat Cushion Cover (for LH Side)))

      Disconnect the c8 front seat cushion heater (separate type front seat cushion cover (for LH side)) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c8-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      c8-3 (IG) - Body ground Engine switch off Below 1 V
      c8-1 (B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      c8-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. INSPECT FRONT SEAT CUSHION HEATER (SEPARATE TYPE FRONT SEAT CUSHION COVER (FOR LH SIDE))


    1. Remove the front seat cushion heater (separate type front seat cushion cover (for LH side)).

      Click here

    2. Inspect the front seat cushion heater (separate type front seat cushion cover (for LH side)).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT CUSHION HEATER (SEPARATE TYPE FRONT SEAT CUSHION COVER (FOR LH SIDE)) Click here

    OK

  5. INSPECT FRONT SEATBACK HEATER (SEPARATE TYPE FRONT SEATBACK COVER (FOR LH SIDE))


    1. Remove the front seatback heater (separate type front seatback cover (for LH side)).

      Click here

    2. Inspect the front seatback heater (separate type front seatback cover (for LH side)).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK HEATER (SEPARATE TYPE FRONT SEATBACK COVER (FOR LH SIDE)) Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER (SEPARATE TYPE FRONT SEAT CUSHION COVER (FOR LH SIDE)))


    1. Disconnect the J42 and J48 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J48-15 (SHD+) - c8-5 (SWR) Always Below 1 Ω
      J48-15 (SHD+) or c8-5 (SWR) - Body ground Always 10 kΩ or higher
      J48-17 (TSL) - c8-6 (THR) Always Below 1 Ω
      J48-17 (TSL) or c8-6 (THR) - Body ground Always 10 kΩ or higher
      J42-8 (SG-5) - c8-4 (PR) Always Below 1 Ω
      J42-8 (SG-5) or c8-4 (PR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    GO TO STEP 11 Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  7. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - FRONT SEAT CUSHION HEATER (FRONT SEAT CUSHION PAD WITH COVER LH) - BODY GROUND)


    1. B005NUGC13
      *a

      Front view of wire harness connector

      (to Front Seat Cushion Heater (Front Seat Cushion Pad with Cover LH))

      Disconnect the c8 front seat cushion heater (front seat cushion pad with cover LH) connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      c8-3 (IG) - Body ground Engine switch on (IG) 11 to 14 V
      c8-3 (IG) - Body ground Engine switch off Below 1 V
      c8-1 (B) - Body ground Always 11 to 14 V
      Standard Resistance
      Tester Connection Condition Specified Condition
      c8-2 (E) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  8. INSPECT FRONT SEAT CUSHION HEATER (FRONT SEAT CUSHION PAD WITH COVER LH)


    1. Remove the front seat cushion heater (front seat cushion pad with cover LH).

      Click here

    2. Inspect the front seat cushion heater (front seat cushion pad with cover LH).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. INSPECT FRONT SEATBACK HEATER (FRONT SEATBACK PAD WITH COVER LH)


    1. Remove the front seatback heater (front seatback pad with cover LH).

      Click here

    2. Inspect the front seatback heater (front seatback pad with cover LH).

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK HEATER (FRONT SEATBACK PAD WITH COVER LH) Click here

    OK

  10. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER ASSEMBLY - FRONT SEAT CUSHION HEATER (FRONT SEAT CUSHION PAD WITH COVER LH))


    1. Disconnect the J42 and J48 air conditioning amplifier assembly connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      J48-15 (SHD+) - c8-5 (SWR) Always Below 1 Ω
      J48-15 (SHD+) or c8-5 (SWR) - Body ground Always 10 kΩ or higher
      J48-17 (TSL) - c8-6 (THR) Always Below 1 Ω
      J48-17 (TSL) or c8-6 (THR) - Body ground Always 10 kΩ or higher
      J42-8 (SG-5) - c8-4 (PR) Always Below 1 Ω
      J42-8 (SG-5) or c8-4 (PR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. 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

  12. CHECK SEAT HEATER OPERATION


    1. Check the operation of the front seat heater.

      Click here

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

    OK

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

    NG

  13. REPLACE REFRESHING SEAT SWITCH (FOR FRONT SIDE)


    1. Temporarily replace the refreshing seat switch (for front side) with a new or known good one.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  14. CHECK SEAT HEATER OPERATION


    1. Check the operation of the front seat heater.

      Click here

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

    OK

    END (REFRESHING SEAT SWITCH (FOR FRONT SIDE) WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here