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Section 349 (Seat Heater System): Inspection

WARNING: This page is about a different car, the 2003 Lexus LX 470. However, it is still accessible from the selected car via links, so may be relevant.
  1. INSPECT SEAT HEATER SWITCH CONTINUITY 
    SPECIFIED CONDITION

    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 Seat Heater Switch Continuity & Terminal
    G03375648Courtesy 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 Positive (+) Lead To Terminal 6
    G03375649Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT SEAT HEATER CUSHION CONTINUITY 

    Inspect the seat heater assy between terminals, as shown.

    Fig 3: Inspecting Seat Heater Assy Between Terminals
    G03375650Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPECIFIED CONDITION

    Tester connection Condition 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.

    Fig 4: Inspecting Seat Heater Assy Between Terminals
    G03375651Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPECIFIED CONDITION

    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.
    Fig 5: Inspecting Seat Heater Assy Continuity Between Terminals (1 Of 2)
    G03375652Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPECIFIED CONDITION

    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.
    Fig 6: Inspecting Seat Heater Assy Continuity Between Terminals (2 Of 2)
    G03375653Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    SPECIFIED CONDITION

    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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