Diagnosis Procedure
- CHECK LIFTING SENSOR CONTROL UNIT OUTPUT SIGNAL
- Turn Ignition Switch ON.
- Read the voltage signal Lifting Sensor Control Unit harness connector and ground with an oscilloscope.
(+)
(-)
Condition
Voltage (V)
(Approx.)
Lifting Sensor Control Unit
Connector
Terminals
B515
82
Ground
Seat Lifting
(rear)
Operate
Other than the above
0 or 12
Is the inspection result normal?
YES
GO TO 2.
NO
GO TO 3.
- CHECK LIFTING SENSOR CONTROL UNIT CIRCUIT
- Turn Ignition Switch OFF.
- Disconnect Driver Seat Control Unit and Lifting Sensor Control Unit connector.
- Check continuity between Driver Seat Control Unit harness connector and Lifting Sensor Control Unit harness connector.
Driver Seat Control Unit
Lifting Sensor Control Unit
Continuity
Connector
Terminal
Connector
Terminal
B514
21
B515
82
Existed
- Check continuity between Driver Seat Control Unit harness connector and ground.
Driver Seat Control Unit
Ground
Continuity
Connector
Terminal
B514
21
Not existed
Is the inspection result normal?
YES
Replace Driver Seat Control Unit. Refer to Removal and Installation .
NO
Repair or replace harness or connector.
- CHECK LIFTING SENSOR CONTROL UNIT INPUT SIGNAL
Read the voltage signal Lifting Sensor Control Unit harness connector and ground with an oscilloscope.
(+)
(-)
Condition
Voltage (V)
(Approx.)
Lifting Sensor Control Unit
Connector
Terminals
B515
80
Ground
Seat Lifting
(rear)
Operate
Other than the above
7 or 12
Is the inspection result normal?
YES
Replace Lifting Sensor Control Unit. Refer to Removal and Installation .
NO
GO TO 4.
- CHECK LIFTING SENSOR (REAR) CIRCUIT
- Turn Ignition Switch OFF.
- Disconnect Lifting Sensor Control Unit connector and lifting motor (rear) connector.
- Check continuity between Lifting Sensor Control Unit harness connector and lifting motor (rear) harness connector.
Lifting Sensor Control Unit
Lifting motor (rear)
Continuity
Connector
Terminal
Connector
Terminal
B515
80
B510
21
Existed
- Check continuity between Driver Seat Control Unit harness connector and ground.
Lifting Sensor Control Unit
Ground
Continuity
Connector
Terminal
B515
80
Not existed
Is the inspection result normal?
YES
GO TO 5.
NO
Repair or replace harness or connector.
- CHECK LIFTING SENSOR (REAR) GROUND
- Turn Ignition Switch OFF.
- Check continuity between lifting motor (rear) harness connector and ground.
Lifting motor (rear)
Ground
Continuity
Connector
Terminal
B510
44
Existed
Is the inspection result normal?
YES
Replace lifting motor (rear).
NO
Repair or replace harness or connector.