Power Seat Control System: Inspection

INSPECT POWER SEAT SWITCH CONTINUITY

Slide switch:

POWER SEAT SLIDE SWITCH CONTINUITY CHECK

Switch Position	Tester Connection	Specified Condition
FRONT	1 - 9, 4 - 6	Continuity
OFF	4 - 6 - 9	Continuity
BACK	1 - 6, 4 - 9	Continuity

Front tilt switch:

POWER SEAT FRONT TILT SWITCH CONTINUITY CHECK

Switch Position	Tester Connection	Specified Condition
UP	1 - 10, 4 - 5	Continuity
OFF	4 - 5 - 10	Continuity
DOWN	1 - 5, 4 - 10	Continuity

Rear lifter switch:

POWER SEAT REAR TILT SWITCH CONTINUITY CHECK

Switch Position	Tester Connection	Specified Condition
UP	1 - 7, 4 - 8	Continuity
OFF	4 - 7 - 8	Continuity
DOWN	1 - 8, 4 - 7	Continuity

Reclining switch:

POWER SEAT RECLINING SWITCH CONTINUITY CHECK

Switch Position	Tester Connection	Specified Condition
FORWARD	1 - 3, 2 - 4	Continuity
OFF	2 - 3 - 4	Continuity
REAR	1 - 2, 3 - 4	Continuity

Fig 1: Identifying Power Seat Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If the continuity is not as specified, replace the switch.

INSPECT LUMBAR SUPPORT SWITCH CONTINUITY

LUMBAR SUPPORT SWITCH CONTINUITY CHECK

Switch Position	Tester Connection	Specified Condition
FORWARD	1 - 4, 2 - 3	Continuity
OFF	1 - 2 - 3	Continuity
RELEASE	1 - 3, 2 - 4	Continuity

Fig 2: Inspecting Lumbar Support Switch Operation

If the continuity is not as specified, replace the switch.

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, and check that the motor turns counterclockwise.
If operation is not as specified, replace the seat adjuster.

Fig 3: Inspecting Slide Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT SLIDE 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 move the seat cushion to the rear position.
2. Continue to apply voltage, and check that current changes to less than 1 A within 4 to 90 seconds.
  
  Fig 4: Inspecting Slide Motor PTC Thermistor (Rear Position)
  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 cushion begins to move forward.
If operation is not as specified, replace the seat adjuster.

Fig 5: Inspecting Slide Motor PTC Thermistor Operation (Forward Position)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FRONT TILT 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, and check that the motor turns counterclockwise.
If operation is not as specified, replace the seat adjuster.

Fig 6: Inspecting Front Tilt Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT FRONT TILT MOTOR PTC THERMISTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 1, the positive (+) lead from the ammeter to terminal 2 and the 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 A within 4 to 90 seconds.
  
  Fig 7: Inspecting Front Tilt Motor PTC Thermistor Operation (Highest Position)
  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 2 and the negative (-) lead to terminal 1. Check that the seat cushion begins to descend.
If operation is not as specified, replace the seat adjuster.

Fig 8: Inspecting Front Tilt Motor PTC Thermistor Operation (Descend Position)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
2. Reverse the polarity, and check that the motor turns counterclockwise.
If operation is not as specified, replace the seat adjuster.

Fig 9: Inspecting Lifter Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT LIFTER MOTOR PTC THERMISTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 1, the positive (+) lead from the ammeter to terminal 2 and the negative (-) lead to the battery negative (-) terminal. Then move the seat cushion to the lowest position.
2. Continue to apply voltage, and check that the current changes to less than 1 A within 4 to 90 seconds.
  
  Fig 10: Inspecting Lifter Motor PTC Thermistor Operation (Lower Position)
  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 2 and the negative (-) lead to terminal 1. Check that the seat cushion begins to ascend.
If operation is not as specified, replace the seat adjuster.

Fig 11: Inspecting Lifter Motor PTC Thermistor Operation (Ascend Position)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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.
2. Reverse the polarity, and check that the motor turns counterclockwise.
If operation is not as specified, replace the seat adjuster.

Fig 12: Inspecting Reclining Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 seatback to the most forward position.
2. Continue to apply voltage, and check that the current changes to less than 1 A within 4 to 90 seconds.
  
  Fig 13: Inspecting Reclining Motor PTC Thermistor Operation (Most Forward Position)
  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 seatback begins to fall backward.
If operation is not as specified, replace the seat adjuster.

Fig 14: Inspecting Reclining Motor PTC Thermistor Operation (Full Backward Position)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 to the release side.
  
  Fig 15: Inspecting Lumbar Support Motor Operation (Release Side)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, and check that the lumbar support moves forward.
If operation is not as specified, replace the lumbar support adjuster.

Fig 16: Inspecting Lumbar Support Motor Operation (Forward Position)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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. Move the lumbar support to the front end position.
  
  Fig 17: Inspecting Lumbar Support Motor Circuit Breaker Operation (Front End Position)
  Courtesy 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, and check that the lumbar support begins to move to the release side within approximately 60 seconds.
If operation is not as specified, replace the lumbar support adjuster.

Fig 18: Inspecting Lumbar Support Motor Circuit Breaker Operation (Release Side)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002