Power Seat Control System: Inspection

Inspect Driver's Power Seat Switch Continuity

Fig 1: Displaying Driver's Power Seat Switch & Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Slide Switch:

Fig 2: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front Vertical Switch:

Fig 3: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Lifter Switch:

Fig 4: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reclining Switch:

Fig 5: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch.
Inspect Driver'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 6: Displaying Wire Harness Side Of Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 7: Displaying Tester Connection Based On Conditions
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If circuit is not as specified, inspect the circuits connected to other parts.
Inspect Passenger's Power Seat Switch Continuity

Fig 8: Displaying Passenger's Power Seat Switch
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Slide Switch:

Fig 9: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front Vertical Switch:

Fig 10: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Lifter Switch:

Fig 11: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reclining Switch:

Fig 12: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch.
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 13: Displaying Wire Harness Side Of Connector
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 14: Displaying Tester Connection Based On Conditions
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If circuit is not as specified, inspect the circuits connected to other parts.
Inspect Driver's Lumbar Support Switch Continuity

Fig 15: Displaying Driver's Lumbar Support Switch & Terminal
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 16: Displaying Continuity Based On Switch Position
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch.
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 17: Displaying Wire Harness Side Of Connection
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  Fig 18: Displaying Tester Connection Based On Conditions
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If circuit is not as specified, inspect the circuits connected to other parts.
Inspect Slide Motor Operation
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the motor turns clockwise.
2. Reverse the polarity, check that the motor turns counterclockwise.
  If operation is not as specified, replace the seat adjuster.
  
  Fig 19: Checking Slide Motor Operation (Clockwise & Counterclockwise)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Inspect Slide Motor PTC Thermistor Operation - Passenger Side
1. Connect the positive (+) lead from the battery to terminal 2 (1), the positive (+) lead from the ammeter to terminal 1 (2) and the negative (-) lead to the battery negative (-) terminal, then move the seat cushion forwards.
  
  Fig 20: Checking Slide Motor Thermistor Operation (Forward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, check that current changes to less than 1 ampere within 4 to 90 seconds.
3. Disconnect the leads from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from the battery to terminal 1 (2) and the negative (-) lead to terminal 2 (1), check that the seat cushion begins to move backwards.
  
  Fig 21: Checking Slide Motor Thermistor Operation (Backward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the seat adjuster.
Inspect Front Vertical Motor Operation
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the motor turns clockwise.
  
  Fig 22: Checking Front Vertical Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns counterclockwise.
  If operation is not as specified, replace the seat adjuster.
Inspect Front Vertical Motor PTC Thermistor Operation - Passenger Side
1. Connect the positive (+) lead from the battery to terminal 1 (2), the positive (+) lead from the ammeter to terminal 2 (1) and the negative (-) lead to the battery negative (-) terminal, then move the seat cushion to the highest position.
  
  Fig 23: Checking Front Vertical Motor PTC Thermistor Operation (Ascending)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, check that the current changes to less than 1 ampere within 4 to 90 seconds.
3. Disconnect the leads from the terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from the battery to terminal 2(1) and the negative (-) lead to terminal 1 (2), check that the seat cushion begins to descend.
  
  Fig 24: Checking Front Vertical Motor PTC Thermistor Operation (Descending)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the seat adjuster.
Inspect Lifter Motor Operation
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the motor turns clockwise.
  
  Fig 25: Checking Lifter Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns counterclockwise.
  If operation is not as specified, replace the seat adjuster.
Inspect Lifter Motor PTC Thermistor Operation
1. Connect the positive (+) lead from the battery to terminal 1 (2), the positive (+) lead from the ammeter to terminal 2 (1) and the negative (-) lead to the battery negative (-) terminal, then move the seat to the highest position.
  
  Fig 26: Checking Lifter Motor PTC Thermistor Operation (Ascending)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, check that the current changes to less than 1 ampere within 4 to 90 seconds.
3. Disconnect the leads from the terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from the battery to terminal 2 (1) and the negative (-) lead to terminal 1 (2), check that the seat cushion begins to descend.
  
  Fig 27: Checking Lifter Motor PTC Thermistor Operation (Descending)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the seat adjuster.
Inspect Reclining Motor Operation
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the motor turns clockwise.
  
  Fig 28: Checking Reclining Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns counterclockwise.
  If operation is not as specified, replace the seat adjuster.
Inspect Reclining Motor PTC Thermistor Operation
1. Connect the positive (+) lead from the battery to terminal 2, the positive (+) lead from the ammeter to terminal 1 and the negative (-) lead to the battery negative (-) terminal, then recline the seat back to the most forward position.
2. Continue to apply voltage, check that the current changes to less than 1 ampere within 4 to 90 seconds.
  
  Fig 29: Checking Reclining Motor PTC Thermistor Operation (Forward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the leads from the terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the seat back begins to fall backward.
  
  Fig 30: Checking Reclining Motor PTC Thermistor Operation (Backward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the seat adjuster.
Inspect Lumbar Support Motor Operation
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2, check that the lumbar support moves backward.
  
  Fig 31: Checking Lumbar Motor Operation (Backward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the lumbar support moves forward.
  
  Fig 32: Checking Lumbar Motor Operation (Forward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the seat adjuster.
Inspect Lumbar Support Motor Circuit Breaker Operation
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 on the lumbar support motor connector and move the lumbar support motor connector and move the lumbar support to front end position.
  
  Fig 33: Checking Lumbar Support Motor Circuit Breaker Operation (Forward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, 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 release side within approximately 60 seconds.
  
  Fig 34: Checking Lumbar Support Motor Circuit Breaker Operation (Backward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  If operation is not as specified, replace the motor.