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Power Seat Control System: Inspection

  1. INSPECT DRIVER'S POWER SEAT SWITCH CIRCUIT (See  POWER SEAT CONTROL SWITCH CIRCUIT  ) 
  2. INSPECT PASSENGER'S POWER SEAT SWITCH CONTINUITY 

    Slide switch: 

    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    FRONT 4-7 -(6) 8 - 11 - (12) Continuity
    OFF 4 - 7 - (6) - 8 Continuity
    BACK 4- 11 -(12) (6)-7-8 Continuity

    Front vertical switch: 

    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    UP 6) - 7 - 10 9 - 11 - (12) Continuity
    OFF (6) - 7 - 9 - 10 Continuity
    DOWN 6 - (7) - 9 10- 11 -(12) Continuity

    Lifter switch: 

    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    UP 2 - (6) -7 3 - 11 - (12) Continuity
    OFF 2 - 3 - (6) - 7 Continuity
    DOWN 2 - 11 -(12) 3 - (6) -7 Continuity

    Reclining switch: 

    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    FORWARD 1 - 11 -(12) 5 - (6) -7 Continuity
    OFF 1 - 5 - (6) - 7 Continuity
    REAR 1 - (6) -7 5 - 11 - (12) Continuity

    If continuity is not as specified, replace the switch.

    Fig 1: Identifying Passenger's Power Seat Switch & Connector Terminals
    G02994031Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. INSPECT PASSENGER'S POWER SEAT SWITCH CIRCUIT 
    1. Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
    2. Inspect the connector on the wire harness side.
    Fig 2: Identifying Passenger's Power Seat Switch Harness Connector Terminals
    G02994032Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    7 - Ground Always Continuity
    11 - Ground Always Battery positive voltage

    If circuit is not as specified, inspect the circuits connected to other parts.

  4. INSPECT DRIVER'S LUMBAR SUPPORT SWITCH CONTINUITY 
    SWITCH POSITION SPECIFIED CONDITION

    Switch position Tester connection Specified condition
    FORWARD 1 - 4 2 - 3 Continuity
    OFF 1 - 2 - 3 Continuity
    RELEASE 1 - 3 2 - 4 Continuity

    If continuity is not as specified, replace the switch.

    Fig 3: Identifying Driver's Lumbar Support Switch & Connector Terminals
    G02994033Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. INSPECT DRIVER'S LUMBAR SUPPORT SWITCH CIRCUIT 
    1. Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
    2. Inspect the connector on the wire harness side.
    Fig 4: Identifying Driver's Lumbar Support Switch Harness Connector Terminals
    G02994034Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    TESTER CONNECTION SPECIFIED CONDITION

    Tester connection Condition Specified condition
    3 - Ground Always Continuity
    4 - Ground Always Battery positive voltage

    If circuit is not as specified, inspect the circuits connected to other parts.

  6. INSPECT SLIDE MOTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, check that the motor turns clockwise.
    2. Reverse the polarity, and check that the motor turns counterclockwise.

    If operation is not as specified, replace the seat adjuster.

    Fig 5: Inspecting Slide Motor Operation
    G02994035Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  7. INSPECT SLIDE MOTOR PTC THERMISTOR OPERATION 

    (): Passenger side 

    1. Connect the battery positive (+) lead to terminal 2 (1), the ammeter positive (+) lead to terminal 1 (2) and the ammeter negative (-) lead to the battery negative (-) terminal, then move the seat cushion to the front position.
    2. Continue to apply voltage, and check that current changes to less than 1 ampere within 4 to 90 seconds.
      Fig 6: Inspecting Slide Motor PTC Thermistor Operation
      G02994036Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the leads from terminals.
    4. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 1 (2) and the battery negative (-) lead to terminal 2 (1), and check that the seat cushion begins to move backwards.

    If operation is not as specified, replace the seat adjuster.

    Fig 7: Checking That Seat Cushion Begins To Move Backwards
    G02994037Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT FRONT VERTICAL MOTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the motor turns clockwise.
    2. Reverse the polarity, and check that the motor turns counterclockwise.

    If operation is not as specified, replace the seat adjuster.

    Fig 8: Inspecting Front Vertical Motor Operation
    G02994038Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSPECT FRONT VERTICAL MOTOR PTC THERMISTOR OPERATION 

    (): Passenger side 

    1. Connect the battery positive (+) lead to terminal 1 (2), the ammeter positive (+) lead to terminal 2 (1) and the ammeter negative (-) lead to the battery negative (-) terminal, then move the seat cushion to the highest position.
    2. Continue to apply voltage, and check that the current changes to less than 1 ampere within 4 to 90 seconds.
      Fig 9: Inspecting Front Vertical Motor PTC Thermistor Operation
      G02994039Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the leads from the terminals.
    4. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 2 (1) and the battery negative (-) lead to terminal 1 (2), and check that the seat cushion begins to descend.

    If operation is not as specified, replace the seat adjuster.

    Fig 10: Checking That Seat Cushion Begins To Descend
    G02994040Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. INSPECT LIFTER MOTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the motor turns clockwise.
    2. Reverse the polarity, and check that the motor turns counterclockwise.

    If operation is not as specified, replace the seat adjuster.

    Fig 11: Inspecting Lifter Motor Operation
    G02994041Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. INSPECT LIFTER MOTOR PTC THERMISTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 (2), the ammeter positive (+) lead to terminal 2 (1) and the ammeter negative (-) lead to the battery negative (-) terminal, then move the seat to the highest position.
    2. Continue to apply voltage, and check that the current changes to less than 1 ampere within 4 to 90 seconds.
      Fig 12: Inspecting Lifter Motor PTC Thermistor Operation
      G02994042Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the leads from the terminals.
    4. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 2 (1) and the battery negative (-) lead to terminal 1 (2), and check that the seat begins to descend.

    If operation is not as specified, replace the seat adjuster.

    Fig 13: Checking That Seat Begins To Descend
    G02994043Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSPECT RECLINING MOTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the motor turns clockwise.
    2. Reverse the polarity, and check that the motor turns counterclockwise.

    If operation is not as specified, replace the seat adjuster.

    Fig 14: Inspecting Reclining Motor Operation
    G02994044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. INSPECT RECLINING MOTOR PTC THERMISTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 2, the ammeter positive (+) lead to terminal 1 and the ammeter negative (-) lead to the battery negative (-) terminal, then recline the seat back to the most forward position.
    2. Continue to apply voltage, and check that the current changes to less than 1 ampere within 4 to 90 seconds.
      Fig 15: Inspecting Reclining Motor PTC Thermistor Operation
      G02994045Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Disconnect the leads from the terminals.
    4. Approximately 60 seconds later, connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the seat back begins to fall backward.

    If operation is not as specified, replace the seat adjuster.

    Fig 16: Checking That Seat Back Begins To Fall Backward
    G02994046Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. INSPECT LUMBAR SUPPORT MOTOR OPERATION 
    1. Connect the battery positive (+) lead to terminal 1 and the battery negative (-) lead to terminal 2, and check that the lumbar support moves to release side.
      Fig 17: Checking That Lumbar Support Moves To Release Side
      G02994047Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Reverse the polarity, check that the lumbar support moves forward.

    If operation is not as specified, replace the seat adjuster.

    Fig 18: Checking That Lumbar Support Moves Forward
    G02994048Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. INSPECT LUMBAR SUPPORT MOTOR CIRCUIT BREAKER OPERATION 
    1. Connect the battery positive (+) lead to terminal 2 and the battery negative (-) lead to terminal 1 on the lumbar support motor connector and move the lumbar support to front end position.
      Fig 19: Inspecting Lumbar Support Motor Circuit Breaker Operation
      G02994049Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Continue to apply voltage, and check that a circuit breaker operation noise can be heard within 4 to 60 seconds.
    3. Reverse the polarity, check that the lumbar support begins to move to the release side within approximately 60 seconds.

    If operation is not as specified, replace the motor.

    Fig 20: Checking That Lumbar Support Begins To Move To Release Side
    G02994050Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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