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Seat Heater System: Inspection

  1. INSPECT SEAT HEATER SWITCH CONTINUITY 
    TESTER CONNECTION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    ON 2-3 - 6 Continuity
    OFF - No continuity
    Illumination circuit 1-4 Continuity

    If continuity is not as specified, replace the switch.

    Fig 1: Inspecting Seat Heater Switch Continuity
    G02946940Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  2. INSPECT SEAT HEATER INDICATOR LIGHT OPERATION 
    1. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 2.
    2. Push the seat heater switch ON 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
    G02946941Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT SEAT HEATER CUSHION REAR SIDE CONTINUITY 
    1. Heat the thermostat with a light.
    2. Inspect the seat heater cushion continuity between terminals, as shown.
      Fig 3: Inspecting Seat Heater Cushion Rear Side Continuity
      G02946942Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPECIFIED CONDITION

    Tester connection Condition Specified condition
    A1 - B2 Seat heater temperature below 25 °C (77 °F) Continuity
    A1 - B2 Seat heater temperature above 45 °C (113 °F) No continuity
    A2 - B1 Always Continuity
    A2 - C1 Always Continuity
    B2 - C2 Always Continuity

    If continuity is not as specified, replace the seat cushion pad.

  4. INSPECT SEAT HEATER CUSHION CIRCUIT 

    Disconnect the connector from the seat heater cushion and inspect the connector on wire harness side, as shown.

    Fig 4: Inspecting Seat Heater Cushion Circuit
    G02946943Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    2 - Body ground Seat heater switch ON Battery Positive Voltage

    If circuit is not as specified, inspect the wire harness.

  5. INSPECT SEAT CUSHION FRONT SIDE CONTINUITY 

    Inspect the seat cushion front side continuity between terminals, as shown.

    Fig 5: Inspecting Seat Cushion Front Side Continuity
    G02946944Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1-2 Always Continuity

    If continuity is not as specified, replace the seat cushion pad.

  6. INSPECT SEAT BACK CONTINUITY 

    Inspect the seat back continuity between terminals, as shown.

    Fig 6: Inspecting Seat Back Continuity
    G02946945Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    1-2 Always Continuity

    If continuity is not as specified, replace the seat back pad.

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