Power Seat Control System: Inspection

INSPECT DRIVER'S POWER SEAT SWITCH CONTINUITY

Fig 1: Inspecting Driver's Power Seat Switch And Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Slide switch:

SPECIFIED CONDITION

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

Front vertical switch:

SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 10, 4 - 5	Continuity
OFF	7 - 5 - 10	Continuity
DOWN	4 - 10, 1 - 5	Continuity

Rear vertical switch:

SPECIFIED CONDITION

Switch position	Tester connection	Specified condition
UP	1 - 7,4 - 8	Continuity
OFF	2 - 7 - 8	Continuity
DOWN	4 - 7, 1 - 8	Continuity

Reclining switch:

SPECIFIED CONDITION

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

If 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 counterclockwise.
  
  Fig 2: Checking Motor Turns Counterclockwise
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the seat adjuster.
INSPECT SLIDE 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 front position.
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 2 and the negative (-) lead to terminal 1, check that the seat cushion begins to move backwards.
  
  Fig 5: Inspecting Slide Motor PTC 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 4 and the negative (-) lead to terminal 5, check that the motor turns counterclockwise.
  
  Fig 6: Inspecting Front Vertical Motor Operation (Counterclockwise)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the seat adjuster.
INSPECT FRONT VERTICAL MOTOR PTC THERMISTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 4, the positive (+) lead from the ammeter to terminal 5 and the negative (-) lead to the battery negative (-) terminal, then move the seat cushion to the highest position.
  
  Fig 8: Inspecting Front Vertical Motor PTC Thermistor Operation (Upward)
  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 5 and the negative (-) lead to terminal 4, check that the seat cushion begins to descend.
  
  Fig 9: Inspecting Front Vertical Motor PTC Thermistor Operation (Downward)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
If operation is not as specified, replace the seat adjuster.
INSPECT REAR VERTICAL MOTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 3 and the negative (-) lead to terminal 6, check that the motor turns counterclockwise.
  
  Fig 10: Inspecting Rear Vertical Motor Operation (Counterclockwise)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns clockwise.
If operation is not as specified, replace the seat adjuster.
INSPECT REAR VERTICAL MOTOR PTC THERMISTOR OPERATION
1. Connect the positive (+) lead from the battery to terminal 3, the positive (+) lead from the ammeter to terminal 6 and the negative (-) lead to the battery negative (-) terminal, then move the seat cushion to the highest position.
  
  Fig 12: Inspecting Rear Vertical Motor PTC Thermistor Operation (Highest Position)
  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 6 and the negative (-) lead to terminal 3, check that the seat cushion begins to descend.
  
  Fig 13: Inspecting Rear Vertical Motor PTC Thermistor Operation (Lowest Position)
  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 2 and the negative (-) lead to terminal 1, check that the motor turns counterclockwise.
  
  Fig 14: Checking Motor Turns Counterclockwise
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Reverse the polarity, check that the motor turns clockwise.
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 1, the positive (+) lead from the ammeter to terminal 2 and the negative (-) lead to the battery negative (-) terminal, then recline the seat back to the most forward position.
  
  Fig 16: Inspecting Reclining Motor PTC Thermistor Operation (Forward Position)
  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.
  
  Fig 17: Inspecting Reclining Motor PTC Thermistor Operation (Backward Position)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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 back starts to fall backward.
If operation is not as specified, replace the seat adjuster.