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Seat Heater System: Inspection

  1. INSPECT SEAT HEATER SWITCH CONTINUITY 
    SEAT HEATER SWITCH SPECIFICATION

    Switch position Tester connection Specified condition
    HI 3 - 4
    5 - 6    		 Continuity
    OFF - No continuity
    LO 4 - 5 Continuity
    Illumination circuit 1 - 2 Continuity
    Fig 1: Identifying Connector
    G03485993Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If the continuity is not as specified, replace the switch.

  2. INSPECT SEAT HEATER INDICATOR LIGHT OPERATION 
    1. Connect the battery positive (+) lead to terminal 6 and the battery negative (-) lead to terminal 4.
    2. Push the seat heater switch Right or Left side and check that the indicator light comes on.

      If the operation is not as specified, replace the switch and inspect the circuits connected to other parts.

      Fig 2: Connecting Battery Lead To Terminals
      G03485994Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT SEAT HEATER CUSHION CONTINUITY 

    Inspect the seat heater assy between terminals, as shown in Fig 3 .

    Fig 3: Inspecting Seat Heater Cushion Continuity
    G03485995Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SEAT HEATER CUSHION CONTINUITY SPECIFICATION

    Tester connection Condition Always Specified condition
    1 - 4 Always Continuity
    2 - 3 Always Continuity

    If the continuity is not as specified, replace the seat heater assy.

  4. INSPECT SEAT BACK CONTINUITY 

    Inspect the seat heater assy between terminals, as shown in Fig 4 .

    Fig 4: Inspecting Seat Heater Assy
    G03485996Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SEAT BACK CONTINUITY SPECIFICATION

    Tester connection Condition Specified condition
    1 - 2 -3 Always Continuity

    If the continuity is not as specified, replace the seat heater assy.

  5. INSPECT SEAT CUSHION AND SEAT BACK OPERATION 
    1. Heat the thermostat with a light.
    2. Connect the seat cushion and the seat back connector.
    3. Inspect the seat heater assy continuity between terminals, as shown in Fig 5 .
      Fig 5: Inspecting Seat Cushion & Seat Back Connector
      G03485997Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      SEAT HEATER ASSY CONTINUITY SPECIFICATION

      Tester connection Condition Specified condition
      1 <--> 4, 2 <--> 3 25 - 35°C (77 - 95°F) Continuity
      1 <--> 4 35 - 45°C (77 - 95°F) Continuity
      2 <--> 3 35 - 45°C (77 - 95°F) No continuity

      If the continuity is not as specified, replace the seat heater assy.

  6. INSPECT SEAT HEATER ASSY (SEAT BACK) OPERATION 
    1. Heat the thermostat with a light.
    2. Connect the seat cushion and the seat back connector.
    3. Inspect the seat heater assy continuity between terminals, as shown in Fig 6 .
      Fig 6: Inspecting Seat Heater Connector
      G03485998Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      SEAT HEATER ASSY CONTINUITY SPECIFICATION

      Tester connection Condition Specified condition
      1 - 2 - 3 25 - 35°C (77 - 95°F) Continuity
      1 - 2 35 - 45°C (77 - 95°F) Continuity
      1 - 3, 2 - 3 35 - 45°C (77 - 95°F) No continuity
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