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

DESCRIPTION

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

WIRING DIAGRAM

B006WTDE06

CAUTION / NOTICE / HINT

Note


  • If the battery voltage is low, the seat heater system may not operate due to operation of battery load control, 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.


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

    NEXT

  2. CHECK FOR DTC


    1. Check for DTCs.


      Body Electrical > Air Conditioner > Trouble Codes
      OK
      DTC B14B5 or B14C1 is not output.
      Result
      Proceed to
      OK
      NG

    NG

    GO TO DIAGNOSTIC TROUBLE CODE CHART Click here

    OK

  3. PERFORM ACTIVE TEST USING GTS


    1. Connect the GTS to the DLC3.

    2. Turn the engine switch on (IG).

    3. Turn the GTS on.

    4. Enter the following menus: Body Electrical / Air Conditioner / Active Test.

    5. Perform the Active Test according to the display on the GTS.


      Body Electrical > Air Conditioner > Active Test
      Tester Display Measurement Item Control Range Diagnostic Note
      Front Left Seat Heater Front seat LH side seat heater operation OFF or ON -

      Body Electrical > Air Conditioner > Active Test
      Tester Display
      Front Left Seat Heater
      OK
      The seat heater operates normally.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE REFRESHING SEAT SWITCH Click here

    NG

  4. INSPECT FRONT SEAT CUSHION HEATER ASSEMBLY LH


    1. Remove the front seat cushion heater assembly LH.

      for Manual Seat: Click here

      for Power Seat: Click here

    2. Inspect the front seat cushion heater assembly LH.

      for Manual Seat: Click here

      for Power Seat: Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH for Manual Seat: Click here
    REPLACE FRONT SEAT CUSHION HEATER ASSEMBLY LH for Power Seat: 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

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FRONT SEATBACK HEATER ASSEMBLY LH Click here

    OK

  6. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - SEAT HEATER CONTROL SUB-ASSEMBLY LH)


    1. B006YHMC06
      *a

      Front view of wire harness connector

      (to Seat Heater Control Sub-assembly LH)

      Disconnect the b18 seat heater control sub-assembly LH connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      b18-1 (+B1) - Body ground Engine switch on (IG) 11 to 14 V
      b18-1 (+B1) - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the b18 seat heater control sub-assembly LH connector.

    2. Disconnect the K56 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
      K56-15 (SHD+) - b18-5 (SWR) Always Below 1 Ω
      K56-15 (SHD+) or b18-5 (SWR) - 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 - FRONT SEAT CUSHION HEATER ASSEMBLY LH)


    1. Disconnect the b6 front seat cushion heater assembly LH connector.

    2. Disconnect the b18 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
      b18-10 (E) - b6-6 Always Below 1 Ω
      b18-10 (E) or b6-6 - Body ground Always 10 kΩ or higher
      b18-7 (HTR1) - b6-1 Always Below 1 Ω
      b18-7 (HTR1) or b6-1 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  9. CHECK HARNESS AND CONNECTOR (FRONT SEAT CUSHION HEATER ASSEMBLY LH - BODY GROUND)


    1. Disconnect the b6 front seat cushion heater assembly LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      b6-2 - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  10. 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

  11. 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

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here