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Home >> Toyota >> 2019 >> Mirai >> Repair and Diagnosis (Single Page) >> Body & Frame >> Seats >> Seat Heater System - Diagnostics & Symptom Tests >> Seat Heater System >> Seat Heater for Rear Right Seat does not Operate [06/2015 - ] >> Procedure

Seat Heater for Rear Right Seat does not Operate [06/2015 - ]: Procedure

  1. INSPECT REAR SEAT HEATER SWITCH RH 
    1. Remove the rear seat heater switch RH.

      Refer to REMOVAL [06/2015 - ]

    2. Inspect the rear seat heater switch RH.

      Refer to INSPECTION [06/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPLACE REAR SEAT HEATER SWITCH RH. Refer to  REMOVAL [06/2015 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK HARNESS AND CONNECTOR (REAR SEAT HEATER SWITCH RH - POWER SOURCE AND BODY GROUND) 
    1. Disconnect the rear seat heater switch RH connector.
      GTY565904Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a Front view of wire harness connector
      (to Rear Seat Heater Switch RH)
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      P32-3 (IG) - Body ground Power switch on (IG) 11 to 14 V
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P32-10 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (REAR SEAT HEATER SWITCH RH - REAR SEATBACK COVER SUB-ASSEMBLY) 
    1. Disconnect the P32 rear seat heater switch RH connector.
    2. Disconnect the Q24 rear seatback cover sub-assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      P32-4 (HI) - Q24-6 (HI) Always Below 1 Ω
      P32-4 (HI) - Body ground Always 10 KΩ or higher
      Q24-6 (HI) - Body ground Always 10 KΩ or higher
      P32-2 (LO) - Q24-5 (LO) Always Below 1 Ω
      P32-2 (LO) - Body ground Always 10 KΩ or higher
      Q24-5 (LO) - Body ground Always 10 KΩ or higher

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  4

  4. CHECK HARNESS AND CONNECTOR (REAR SEATBACK COVER SUB-ASSEMBLY - BODY GROUND) 
    1. Disconnect the Q24 rear seatback cover sub-assembly connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q24-1 (E) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

    Result: 

    OK 

    See step  5

  5. INSPECT REAR SEATBACK COVER SUB-ASSEMBLY 
    1. Remove the rear seatback cover sub-assembly.

      Refer to REMOVAL [06/2015 - ]

    2. Inspect the rear seatback cover sub-assembly.

      Refer to INSPECTION [06/2015 - ]

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    END (REAR SEAT CUSHION COVER SUB-ASSEMBLY RH WAS DEFECTIVE) 

    Result: 

    NG 

    REPLACE REAR SEATBACK COVER SUB-ASSEMBLY. Refer to  REMOVAL [06/2015 - ]