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HOMESERVICE MANUALSTOYOTA2004CELICA GT, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 441 (POWER SEAT CONTROL SYSTEM)INSPECTION

2004 Toyota Celica GT, Standard

Section 441 (Power Seat Control System): Inspection

2004 Toyota Celica GT, StandardSECTION Inspection

WARNING: This page is about a different car, the 2003 Lexus LS 430. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT FRONT PASSENGER'S POWER SEAT SWITCH CONTINUITY

Slide switch:

CONNECTOR TERMINALS SPECIFIED 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

Reclining switch:

CONNECTOR TERMINALS SPECIFIED 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

Fig 1: Inspecting Front Passenger'S Power Seat Switch Continuity

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Front vertical switch:

CONNECTOR TERMINALS SPECIFIED 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

Lifter switch:

CONNECTOR TERMINALS SPECIFIED 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 FRONT 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 2: Identifying Front Passenger'S Power Seat Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CONNECTOR TERMINALS SPECIFIED CONDITION

Tester connection	Condition	Specified condition
6 - 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

Upper side control:

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
FORWARD	5 - 1 4 - 6	Continuity
OFF	1 - 6 4 - 6	Continuity
RELEASE	1 - 6 4 - 5	Continuity

Fig 3: Identifying Driver'S Lumbar Support Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Lower side control:

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
FORWARD	2 - 5 3 - 6	Continuity
OFF	2 - 6 3 - 6	Continuity
RELEASE	2 - 6 3 - 5	Continuity

If continuity is not as specified, replace the switch.

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 4: Identifying Driver'S Lumbar Support Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CONNECTOR TERMINALS SPECIFIED CONDITION

Tester connection	Condition	Specified condition
6 - Ground	Constant	Continuity
5 - Ground	Constant	Battery positive voltage

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

INSPECT DRIVER'S SEAT CUSHION SWITCH CIRCUIT

CONNECTOR TERMINALS SPECIFIED CONDITION

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

If continuity is not as specified, replace the switch.

Fig 5: Driver'S Seat Cushion Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT PASSENGER'S LUMBAR SUPPORT SWITCH CIRCUIT

CONNECTOR TERMINALS SPECIFIED CONDITION

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

If continuity is not as specified, replace the switch.

Fig 6: Identifying Passenger'S Lumbar Support Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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 7: Identifying Passenger'S Lumbar Support Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

CONNECTOR TERMINALS SPECIFIED 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 POWER SEAT SUB SWITCH CONTINUITY

Slide switch:

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
FRONT	5 - 10	Continuity
OFF	-	Continuity
REAR	6 - 10	Continuity

Reclining switch:

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
FRONT	4 - 10	Continuity
OFF	-	Continuity
REAR	9 - 10	Continuity

Fig 8: Identifying Passenger Power Seat Sub Switch Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If continuity is not as specified, replace the switch.

INSPECT REAR SEAT RETURN SWITCH CONTINUITY

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
ON	6 - 9	Continuity

If continuity is not as specified, replace the switch.

Fig 9: Identifying Rear Seat Return Switch Connector Terminals

Front seat: INSPECT SLIDE MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 and check that the motor turns counterclockwise.
2. Reverse the polarity and check that the motor turns clockwise.
  If operation is not as specified, replace the motor.
  
  Fig 10: Inspecting Slide Motor Operation - Front Seat
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT SLIDE MOTOR PTC THERMISTOR OPERATION (): Passenger's seat
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 battery negative (-) terminal, then move the seat to front position.
2. Continue to apply voltage and check that the current changes to less than 1 ampere with 4 to 90 seconds.
  
  Fig 11: Inspecting Slide Motor PTC Thermistor Operation - Passenger'S Seat (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the lead from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 1(2) and the negative (-) lead to terminal 2(1) and check that the seat begins to move backwards.
  If operation is not as specified, replace the motor.
  
  Fig 12: Inspecting Slide Motor PTC Thermistor Operation - Passenger'S Seat (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT FRONT VERTICAL MOTOR OPERATION (): Passenger's seat
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 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 motor.
  
  Fig 13: Inspecting Front Vertical Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT FRONT VERTICAL MOTOR PTC THERMISTOR OPERATION (): Passenger's seat
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 battery negative (-) terminal, then move the front edge of seat cushion to the highest position.
  
  Fig 14: Inspecting Front Vertical Motor PTC Thermistor Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, and check the current changes to less than 1 ampere with 4 to 90 seconds.
3. Disconnect the leads from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 2(1) and the negative (-) lead to terminal 1(2), and check that the seat cushion begins to descend.
  If operation is not as specified, replace the motor.
  
  Fig 15: Inspecting Front Vertical Motor PTC Thermistor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT LIFTER MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, 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 motor.
  
  Fig 16: Inspecting Lifter Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT LIFTER MOTOR PTC THERMISTOR OPERATION (): Passenger's seat
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 battery negative (-) terminal, then move the rear edge of seat cushion to the highest position.
2. Continue to apply voltage, and check that the current changes to less than 1 ampere with 4 to 90 seconds.
  
  Fig 17: Inspecting Lifter Motor PTC Thermistor Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the leads from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 1(2) and the negative (-) lead to terminal 2(1) and check that the seat cushion begins to descend.
  If operation is not as specified, replace the motor.
  
  Fig 18: Inspecting Lifter Motor PTC Thermistor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT RECLINING MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1, and check that the motor turns counterclockwise.
2. Reverse the polarity, and check that the motor turns clockwise.
  If operation is not as specified, replace the motor.
  
  Fig 19: Inspecting Reclining Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT RECLINING 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 battery negative (-) terminal, then recline the seat back to the most forward position.
2. Continue to apply voltage, and check that the current change to less than 1 ampere with 4 to 90 seconds.
  
  Fig 20: Inspecting Reclining Motor PTC Thermistor Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the lead from terminals,
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 2 and the negative (-) lead to terminal 1, check that the seat back starts to fall backwards.
  If operation is not as specified, replace the motor.
  
  Fig 21: Inspecting Reclining Motor PTC Thermistor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT LUMBAR SUPPORT MOTOR OPERATION (): Driver's Upper Side Control
1. Connect the positive (+) lead from the battery to terminal 1(2) and the negative (-) lead to terminal 2(1) and check that the lumbar support moves release side.
  
  Fig 22: Inspecting Lumbar Support Motor Operation (1 Of 2)
  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 motor.
  
  Fig 23: Inspecting Lumbar Support Motor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT LUMBAR SUPPORT MOTOR PTC THERMISTOR OPERATION
() : Driver's Upper Side Control
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 battery negative (-) terminal, then move the front edge of seat cushion to the highest position.
2. Continue to apply voltage, and check that the current changes to less than 1 ampere with 4 to 90 seconds.
  
  Fig 24: Inspecting Lumbar Support Motor PTC Thermistor Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the leads from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 1(2), and the negative (-) lead to terminal 2(1) and check that the seat cushion begins to descend.
  If operation is not as specified, replace the motor.
  
  Fig 25: Inspecting Lumbar Support Motor PTC Thermistor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seat: INSPECT HEADREST MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 1, and the negative (-) lead to terminal 5, and check that the motor turns counterclockwise.
2. Reverse the polarity, and check that the motor turns clockwise.
  If operation is not as specified, replace the motor.
  
  Fig 26: Inspecting Headrest Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Front seats: INSPECT HEADREST MOTOR CIRCUIT BREAKER OPERATION
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 5 on the motor connector and move the headrest to DOWN position.
  
  Fig 27: Inspecting Headrest Motor Circuit Breaker Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, check that there is a circuit breaker operation noise within 4 to 60 seconds.
3. Reverse the polarity check that the headrest begins to move UP side within approx. 60 seconds.
  If operation is not as specified, replace the motor.
  
  Fig 28: Inspecting Headrest Motor Circuit Breaker Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Rear seat: INSPECT SLIDE MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 2 and the negative (-) lead to terminal 1 and check that the motor turns counterclockwise.
2. Reverse the polarity and check that the motor turns clockwise.
  If operation is not as specified, replace the motor.
  
  Fig 29: Inspecting Slide Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Rear seat: INSPECT SLIDE MOTOR PTC THERMISTOR OPERATION
() : LH Seat Side Control
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 battery negative (-) terminal, then move the seat to front position.
2. Continue to apply voltage and check that the current changes to less than 1 ampere with 4 to 90 seconds.
  
  Fig 30: Inspecting Slide Motor PTC Thermistor Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
3. Disconnect the leads from terminals.
4. Approximately 60 seconds later, connect the positive (+) lead from battery to terminal 1(2), and the negative (-) lead to terminal 2(1) and check that the seat begins to move backwards.
  If operation is not as specified, replace the motor.
  
  Fig 31: Inspecting Slide Motor PTC Thermistor Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Rear seat: INSPECT HEADREST MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 1, and the negative (-) lead to terminal 5, and check that the motor turns counterclockwise.
2. Reverse the polarity, and check that the motor turns clockwise.
  If operation is not as specified, replace the motor.
  
  Fig 32: Inspecting Headrest Motor Operation
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Rear seat: INSPECT HEADREST MOTOR CIRCUIT BREAKER OPERATION
1. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 5 on the motor connector and move the headrest to DOWN position.
  
  Fig 33: Inspecting Headrest Motor Circuit Breaker Operation (1 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Continue to apply voltage, check that there is a circuit breaker operation noise within 4 to 60 seconds.
3. Reverse the polarity check that the headrest begins to move UP side within approx. 60 seconds.
  If operation is not as specified, replace the motor.
  
  Fig 34: Inspecting Headrest Motor Circuit Breaker Operation (2 Of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

INSPECT SEAT VIBRATOR

Measure the resistance between terminals.

RESISTANCE SPECIFICATIONS

Between terminals	Resistance(Ω)
1 - 2	1.8 +/- 0.3
1 or 2 - Body ground	5M
3 - Body ground	0

If resistance value is not as specified, replace the vibrator assembly.

Fig 35: Identifying Seat Vibrator Connector Terminals

INSPECT VIBRATOR ECU CIRCUIT

Inspect the connector on the wire harness side.

Fig 36: Vibrator ECU Connector Terminals

CONNECTOR TERMINALS SPECIFIED CONDITION

Tester connection	Condition	Specified condition
1 - 6	Constance	Continuity
2 - Body ground	Seat vibrator switch ON	Continuity
5 - Body ground	Ignition switch ON	Battery positive voltage
7 - Body ground	Seat vibration switch OFF	Continuity
10 - Body ground	Constance	Continuity
12 - Body ground	Constance	Continuity
6 - 2 (connector connected)	Ignition switch ON and seat Vibrator switch ON	Battery positive voltage

If continuity is not as specified, replace the seat vibration ECU.

INSPECT REAR SEAT MEMORY SWITCH

CONNECTOR TERMINALS SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
SET switch ON	1 - 7	Continuity
M switch ON	1 - 5	Continuity
C switch ON	1 - 2	Continuity

Fig 37: Identifying Rear Seat Memory Switch Connector Terminals

INSPECT REAR SEAT HEADREST LIMIT SWITCH

CONNECTOR TERMINALS SPECIFIED CONDITION

Shaft length	Tester connection	Specified condition
12mm (A)	-	Continuity
8.5mm (B)	1 - 2	Continuity

Measure the resistance between terminals.

If resistance value is not as specified, replace the vibrator assembly.

Fig 38: Identifying Rear Seat Headrest Limit Switch Connector Terminals

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.