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

DESCRIPTION

When the refreshing seat switch is operated, the air conditioning amplifier assembly receives the signal via the LIN communication line, and operates the seat heater for the corresponding rear seat.

WIRING DIAGRAM

B005BAFE02
B0059EWE02

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.

    Tech Tips

    If the battery voltage is low, "Operation Limitation Control History Count (Level 1)" and "Operation Limitation Control History Count (Level 2) is counted.

    Click here


  • If the battery voltage is low, the seat heater system may not operate. Refer to Data List for the power steering system.


    • for Manual Tilt and Manual Telescopic Steering Column: Click here

    • for Power Tilt and Power Telescopic Steering Column: Click here

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

  • When the battery is disconnected or the air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    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
      DTC B14C3 is not output.
      Result
      Proceed to
      OK
      NG

    NG
    OK
  3. CHECK HARNESS AND CONNECTOR (SEPARATE TYPE REAR SEATBACK COVER LH - BATTERY AND BODY GROUND)


    1. B005772C02
      *a

      Front view of wire harness connector

      (to Separate Type Rear Seatback Cover LH)

      Disconnect the separate type rear seatback cover LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      i7-4 - Body ground Always Below 1 Ω
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      i7-1 - Body ground Engine switch on (IG) 11 to 14 V
      i7-1 - Body ground Engine switch off Below 1 V
      Result
      Proceed to
      OK
      NG

    NG
    OK
  4. INSPECT SEPARATE TYPE REAR SEATBACK COVER LH


    1. Remove the separate type rear seatback cover LH.


    2. Inspect the separate type rear seatback cover LH.


      Result
      Proceed to
      OK
      NG

    NG
    OK
  5. CHECK HARNESS AND CONNECTOR (SEPARATE TYPE REAR SEATBACK COVER LH - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the i7 separate type rear seatback cover LH connector.

    2. Disconnect the I50 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
      i7-5 - I50-36 (SHDE) Always Below 1 Ω
      i7-5 or I50-36 (SHDE) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  6. CHECK HARNESS AND CONNECTOR (BENCH TYPE REAR SEAT CUSHION COVER - SEPARATE TYPE REAR SEATBACK COVER LH AND BODY GROUND)


    1. Disconnect the i6 bench type seat cushion cover connector.

    2. Disconnect the i7 separate type rear seatback cover LH connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      i6-5 - i7-3 Always Below 1 Ω
      i6-4 - i7-2 Always Below 1 Ω
      i6-1 - Body ground Always Below 1 Ω
      i6-5 or i7-3 - Body ground Always 10 kΩ or higher
      i6-4 or i7-2 - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG
    OK
  7. INSPECT BENCH TYPE REAR SEAT CUSHION COVER


    1. Remove the bench type rear seat cushion cover.


    2. Inspect the bench type rear seat cushion cover.


      Result
      Proceed to
      OK
      NG

    NG
    OK
  8. CHECK 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

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

    OK
    NG