Front

LIFTING SENSOR (FRONT)

Description

- The lifting sensor (front) is installed to the seat 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.Select "LIFT FR PULSE" in "Date monitor" mode with CONSULT.
2.Check the lifting sensor (front) signal under the following conditions.





Is the indication normal?
YES- Inspection End.
NO- Perform diagnosis procedure. .


Diagnosis Procedure

Regarding Wiring Diagram information, [1][2]Electrical Diagrams.

1. CHECK LIFTING SENSOR (FRONT) SIGNAL

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





Is the inspection result normal?
YES- GO TO 4
NO- GO TO 2

2. CHECK LIFTING SENSOR (FRONT) CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect driver seat control unit and front power seat LH [lifting motor (front)].
3.Check continuity between driver seat control unit harness connector and front power seat LH [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.
2.Turn ignition switch ON.
3.Check voltage between front power seat LH [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.
3.Check continuity between driver seat control unit harness connector and front power seat LH [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. Service and Repair.
NO- Repair or replace harness.

5. CHECK LIFTING SENSOR (FRONT) GROUND






1.Turn ignition switch OFF.
2.Check continuity between front power seat LH [lifting motor (front)] harness connector and ground.





Is the inspection result normal?
YES- Replace front power seat LH [lifting motor (front)]. Removal And Installation With Climate Controlled Seats.
NO- Repair or replace harness.