Driver Side

HEAT SENSOR:_:DRIVER SIDE





Description
Detects seat cushion heater temperature and outputs to heated seat control unit.




Component Function Check
1.CHECK FUNCTION
Check that heated seat warms to preset temperature when operating heated seat switch to the optimal position.
Is the inspection result normal?
YES - Heat sensor function is OK.
NO - Testing and Inspection




Diagnosis Procedure
1.CHECK HEAT SENSOR INPUT SIGNAL
1. Turn ignition switch ON.
2. Check voltage between heated seat control unit harness connector and ground.






NOTE:
Voltage is repeated within the value shown as per the following list depending on heater unit temperature.
Is the inspection result normal?
YES - Heat sensor function is OK.
NO - GO TO 2.
2.CHECK HEAT SENSOR CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat control unit connector and seat cushion heater connector.
3. Check continuity between heated seat control unit harness connector and seat cushion heater harness connector.





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





Is the inspection result normal?
YES - GO TO 3.
NO - Repair or replace harness.
3.CHECK HEAT SENSOR POWER SUPPLY
1. Turn ignition switch ON.
2. Check voltage between seat cushion heater harness connector and ground.





Is the inspection result normal?
YES - GO TO 5.
NO - GO TO 4.
4.CHECK HEAT SENSOR POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect heated seat switch connector.
3. Check continuity between heated seat control unit harness connector and seat cushion heater harness connector.





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





Is the inspection result normal?
YES - GO TO 6.
NO - Repair or replace harness.
5.CHECK HEAT SENSOR
Check heat sensor. SEE Component Inspection.
Is the inspection result normal?
YES - GO TO 6.
NO - Replace seat cushion heater. Exploded View.
6.CHECK INTERMITTENT INCIDENT
Check intermittent incident. Intermittent Incident.
- INSPECTION END




Component Inspection
1.CHECK HEAT SENSOR
1. Turn ignition switch OFF.
2. Disconnect seat cushion heater connector.
3. Check resistance between seat cushion heater terminals as follows.






NOTE:
Resistance value changes according to temperature.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace seat cushion heater. Exploded View.