Power Seat Control System: Inspection

INSPECT LUMBAR SUPPORT SWITCH CONTINUITY

Fig 1: Identifying Lumbar Support Switch Position & Terminals

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Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

LUMBAR SUPPORT SWITCH CONTINUITY

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

If continuity is not as specified, replace the switch.

INSPECT 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 2: Identifying Lumbar Support Switch Circuit Terminals (Wire Harness Side)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

LUMBAR SUPPORT SWITCH CIRCUIT TESTER CONNECTION AND SPECIFIED CONDITION

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

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

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 3: Inspecting Lumbar Support Motor Operation (Positive To Terminal 1)
  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 lumber support adjuster.
  
  Fig 4: Inspecting Lumbar Support Motor Operation (Reversed Polarity)
  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 and move the lumbar support to front end position.
  
  Fig 5: Inspecting Lumbar Support Motor Circuit Breaker Operation (1 of 2)
  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 to release side within approximately 60 seconds.
  If operation is not as specified, replace the lumber support adjuster.
  
  Fig 6: Inspecting Lumbar Support Motor Circuit Breaker Operation (2 of 2)
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002