Power Seat Control System (W/O Driving Position Memory: Inspection

INSPECT DRIVER'S POWER SEAT SWITCH CONTINUITY

Slide switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
FRONT	1 - 9 4 - 6	Continuity
OFF	4 - 6 4 - 9	Continuity
BACK	1 - 6 4 - 9	Continuity

Front vertical switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 10 4 - 5	Continuity
OFF	4 - 5 4 -10	Continuity
DOWN	1 - 5 4 - 10	Continuity

Lifter switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 7 4 -8	Continuity
OFF	4 - 7 4 - 8	Continuity
DOWN	1 - 8 4 - 7	Continuity

Reclining switch:

CONTINUITY CONDITION

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

If continuity is not as specified, replace the switch.

Fig 1: Identifying Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT DRIVER'S POWER SEAT SWITCH CIRCUIT

Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
Inspect the connector on the wire harness side.

Fig 2: Identifying Connector Terminals

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TESTER CONNECTION AND CONDITION

Tester connection	Condition	Specified condition
4 - Ground	Constant	Continuity
1 - Ground	Constant	Battery positive voltage

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

INSPECT PASSENGER'S POWER SEAT SWITCH CONTINUITY

Slide switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
FRONT	1 - 9 4 - 6	Continuity
OFF	4 - 6 4 - 9	Continuity
BACK	1 - 6 4 - 9	Continuity

Front vertical switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 5 4 - 10	Continuity
OFF	4 - 5 4 - 10	Continuity
DOWN	1 - 10 4 - 5	Continuity

Lifter switch:

CONTINUITY CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 8 4 - 7	Continuity
OFF	4 - 7 4 - 8	Continuity
DOWN	1 - 7 4 - 8	Continuity

Fig 3: Identifying Connector Terminal

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Reclining switch:

CONTINUITY CONDITION

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

If continuity is not as specified, replace the switch.

INSPECT PASSENGER'S POWER SEAT SWITCH CIRCUIT

Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
Inspect the connector on the wire harness side.

Fig 4: Identifying Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

TESTER CONNECTION AND CONDITION

Tester connection	Condition	Specified condition
4 - Ground	Constant	Continuity
1 - Ground	Constant	Battery positive voltage

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

INSPECT DRIVER'S LUMBAR SUPPORT SWITCH CONTINUITY

CONTINUITY CONDITION

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

If continuity is not as specified, replace the switch.

Fig 5: Identifying Connector

INSPECT DRIVER'S LUMBAR SUPPORT SWITCH CIRCUIT

Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
Inspect the connector on the wire harness side.

Fig 6: Identifying Connector Terminal

TESTER CONNECTION AND CONDITION

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

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

INSPECT PASSENGER'S LUMBAR SUPPORT SWITCH CONTINUITY

CONTINUITY CONDITION

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

If continuity is not as specified, replace the switch.

Fig 7: Identifying Connector

INSPECT PASSENGER'S LUMBAR SUPPORT SWITCH CIRCUIT

Disconnect the switch connector and connect the seat wire harness to the floor wire harness.
Inspect the connector on the wire harness side.

Fig 8: Identifying Connector

TESTER CONNECTION AND CONTINUITY

Tester connection	Condition	Specified condition
2 - Ground	Constant	Continuity
1 - Ground	Constant	Battery positive voltage

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 counterclockwise.
2. Reverse the polarity, check that the motor turns clockwise.
  If operation is not as specified, replace the seat adjuster.
Fig 9: Inspecting Slide Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT SLIDE 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 front position.
2. Continue to apply voltage, check that current changes to less than 1 ampere within 4 to 90 seconds.
  
  Fig 10: Inspecting Slide Motor PTC Thermistor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the leads from 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 move backwards.
  If operation is not as specified, replace the seat adjuster.
Fig 11: Checking Backward Movement
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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 counterclockwise.
2. Reverse the polarity, check that the motor turns clockwise.
  If operation is not as specified, replace the seat adjuster.
Fig 12: Inspecting Front Vertical Motor Operation
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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
2. continue to apply voltage, check that the current changes to less than 1 ampere within 4 to 90 seconds.
  
  Fig 13: Inspecting Front Vertical 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 (1) and the negative (-) lead to terminal 1 (2), check that the seat cushion begins to descend.
  If operation is not as specified, replace the seat adjuster.
Fig 14: Checking Downward Movement
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INSPECT REAR 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 counterclockwise.
2. Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the seat adjuster.

Fig 15: Inspecting Rear Vertical Motor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT REAR VERTICAL MOTOR PTC THERMISTOR OPERATION
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 to the highest position.
2. Continue to apply voltage, check that the current changes to less than 1 ampere within 4 to 90 seconds.
  
  Fig 16: Inspecting Rear Vertical 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 (2) and the negative (-) lead to terminal 2 (1), check that the seat cushion begins to descend.
  If operation is not as specified, replace the seat adjuster.
Fig 17: Checking Downward Movement
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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 counterclockwise.
2. Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the seat adjuster.

Fig 18: Inspecting Reclining Motor Operation
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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 19: 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 seat back begins to fall backward.
  If operation is not as specified, replace the seat adjuster.
Fig 20: Checking Backward Movement
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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 release side.
  
  Fig 21: Inspecting Lumbar Support Motor Operation
  Courtesy 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 22: Checking Lumbar Support Forward Movement
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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 to front end position.
  
  Fig 23: Inspecting Lumbar Support Motor Circuit Breaker Operation
  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 release side with in approximately 60 seconds.
  If operation is not as specified, replace the motor.
Fig 24: Checking Lumbar Support Begins Moving Release Side
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002