Front

LIFTING SENSOR (FRONT)

Description

- The lifting sensor (front) is installed to the seat slide cushion frame.
- The pulse signal is input to the driver seat control unit when the lifting (front) is operated.
- The driver seat control unit counts the pulse and calculates the lifting (front) amount of the seat.


Component Function Check


1. CHECK FUNCTION

1.Turn ignition switch ON.
2.Select "LIFT FR PULSE" in the "Data monitor" mode using CONSULT.
3.Check the lifting sensor (front) signal under the following conditions.





Is the indication normal?
YES- INSPECTION END
NO- Perform diagnosis procedure. Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK LIFTING SENSOR (FRONT) SIGNAL

1.Turn ignition switch ON.
2.Check the voltage signal driver seat control unit harness connector and ground with an oscilloscope.





Is the inspection result normal?
YES- Replace driver seat control unit. Refer to"Removal and Installation" Removal and Installation.
NO- GO TO 2.

2. CHECK LIFTING SENSOR (FRONT) CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect driver seat control unit and lifting motor (front) connector.
3.Check continuity between driver seat control unit harness connector and lifting motor (front) harness connector.





4.Check continuity between driver seat control unit harness connector and ground.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair or replace harness.

3. CHECK LIFTING SENSOR (FRONT) POWER SUPPLY

1.Connect driver seat control unit connector.
2.Turn ignition switch ON.
3.Check voltage between lifting motor (front) harness connector and ground.





Is the inspection result normal?
YES- GO TO 5.
NO- GO TO 4.

4. CHECK LIFTING SENSOR (FRONT) POWER SUPPLY CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect driver seat control unit connector.
3.Check continuity between driver seat control unit harness connector and lifting motor (front) harness connector.





4.Check continuity between driver seat control unit harness connector and ground.





Is the inspection result normal?
YES- Replace driver seat control unit. Refer to "Removal and Installation" Removal and Installation.
NO- Repair or replace harness.

5. CHECK LIFTING SENSOR (FRONT) GROUND CIRCUIT 1

1.Turn ignition switch OFF.
2.Disconnect driver seat control unit connector.
3.Check continuity between driver seat control unit harness connector and lifting motor (front) harness connector.





Is the inspection result normal?
YES- GO TO 6.
NO- Repair or replace harness.

6. CHECK LIFTING SENSOR (FRONT) GROUND CIRCUIT 2

1.Connect driver seat control unit connector.
2.Check continuity between lifting motor (front) harness connector and ground.





Is the inspection result normal?
YES- Replace lifting motor (front). Refer to "Exploded View" Exploded View.
NO- Replace driver seat control unit. Refer to "Removal and Installation" Removal and Installation.