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Seat Heater System: Inspection

  1. INSPECT SEAT HEATER SWITCH CONTINUITY 
    SEAT HEATER SWITCH CONTINUITY

    Switch position Tester connection Specified condition
    HI 3-4
    5-6    		 Continuity
    OFF - No Continuity
    LO 4-5 Continuity
    Illumination circuit 1-2 Continuity

    If continuity is not as specified, replace the switch.

    Fig 1: Inspecting Seat Heater Switch Continuity
    G02904513Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT SEAT HEATER INDICATOR LIGHT OPERATION 
    1. Connect the positive (+) lead from the battery to terminal 6 and the negative (-) lead to terminal 4.
    2. Push the seat heater switch Right or Left side and check that the indicator light lights up.

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

      Fig 2: Inspecting Seat Heater Indicator Light Operation
      G02904514Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT SEAT HEATER ASSY (SEAT CUSHION) CONTINUITY 

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

    SEAT HEATER ASSY CONTINUITY

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

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

    Fig 3: Inspecting Seat Heater Assembly Connector
    G02904515Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  4. INSPECT SEAT HEATER ASSY (SEAT BACK) CONTINUITY 

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

    Fig 4: Inspecting Seat Heater Indicator Light Operation
    G02904516Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SEAT HEATER ASSY (SEAT BACK) CONTINUITY

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

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

  5. INSPECT SEAT HEATER ASSY (SEAT CUSHION) OPERATION 
    Fig 5: Inspecting Seat Heater Assy (Seat Cushion) Operation
    G02904517Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Heat the thermostat with a light.
    2. Connect the seat cushion and seat back connector.
    3. Inspect the seat heater assy continuity between terminals, as shown in Fig 6 .
    INSPECTING SEAT HEATER ASSEMBLY (SEAT CUSHION) OPERATION

    Tester connection Condition Specified condition
    1 <-> 4,2 <-> 3 25-35°C Continuity
    1 <-> 4 35-45°C Continuity
    2 <-> 3 35-45°C No Continuity

    If 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 seat back connector.
    3. Inspect the seat heater assy continuity between terminals, as shown in Fig 6 .
      Fig 6: Inspecting Seat Heater Assy (Seat Back) Operation
      G02904518Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      SEAT HEATER ASSY (SEAT BACK) OPERATION

      Tester connection Condition Specified condition
      1-2-3 25-35°C Continuity
      1-2 35-45°C Continuity
      1-3, 2-3 35-45°C No Continuity
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