Lifting Sensor (Front)

LIFTING SENSOR (FRONT)





Description
- The lifting sensor (front) is installed to the power seat frame assembly.
- 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 "Data monitor" mode with CONSULT-III.
2. Check the lifting sensor (front) signal under the following conditions.





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




Diagnosis Procedure
Regarding Wiring Diagram information, Electrical Diagrams.
1. CHECK LIFTING SENSOR (FRONT) SIGNAL





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





3. 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 SEAT OPERATION
1. Connect driver seat control unit and lifting motor (front) connector.
2. Check seat operation [except lifting (front) operation] with memory function.
Is the operation normal?
YES - Replace lifting motor (front). (Built in power seat frame assembly). Overhaul.
NO - Replace driver seat control unit. Service and Repair.
4. CHECK INTERMITTENT INCIDENT
Intermittent Incident.
Is the inspection result normal?
YES - Replace driver seat control unit. Service and Repair.
NO - Repair or replace the malfunctioning part.