Power Seat Control System: Inspection

INSPECT POWER SEAT SWITCH CONTINUITY

Slide switch:

SLIDE SWITCH

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:

FRONT TILT SWITCH

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:

REAR LIFTER SWITCH

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

Fig 1: Inspecting Power Seat Switch

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Reclining switch:

RECLINING SWITCH

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

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

INSPECT LUMBAR SUPPORT SWITCH CONTINUITY

TESTER CONNECTION AND 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 the continuity is not as specified, replace the switch.

Fig 2: Inspecting Lumbar Support 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: Checking Motor Turns Clockwise
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 Operation
  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: Checking Seat Cushion Begins To Move Forward
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: Checking Motor Turns Counterclockwise
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
  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: Checking Seat Cushion Begins To Descend
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: Checking Motor Turns Counterclockwise
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
  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: Checking Seat Cushion Begins To Ascend
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: Checking Motor Turns Counterclockwise
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
  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: Checking Seatback Begins To Fall Backward
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
  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: Checking Lumbar Support Moves Forward
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
  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: Checking Circuit Breaker Operation Noise
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002