Cabin Temperature Sensor / Switch: Testing and Inspection

IN-VEHICLE SENSOR





Description

COMPONENT DESCRIPTION





- The in-vehicle sensor (1) is installed to the finisher.
- The in-vehicle sensor converts the interior air temperature of the passenger room sucked by the aspirator detected with the thermistor into the voltage, and the A/C auto amp. inputs this voltage.

ASPIRATOR






Arrow indicates Vehicle front


The aspirator (1) generates the vacuum by the air blown from the A/C unit assembly and draws the air of the passenger room to the in vehicle sensor area via the aspirator duct.

INTERIOR AIR TEMPERATURE CORRECTION





- The A/C auto amp. inputs the temperature detected with the in-vehicle sensor as the interior air temperature.
- Perform the correction of the temperature detected with the in-vehicle sensor for each air conditioner control.




Diagnosis Procedure
1.CHECK IN-VEHICLE SENSOR POWER SUPPLY CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the in-vehicle sensor connector.
3. Turn the ignition switch ON.
4. Check voltage between in-vehicle sensor harness connector and the ground.






Is the inspection result normal?
YES - GO TO 2.
NO - GO TO 4.
2.CHECK IN-VEHICLE SENSOR GROUND CIRCUIT CONTINUITY
1. Turn the ignition switch OFF.
2. Disconnect the A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.






Is the inspection result normal?
YES - GO TO 3.
NO - Repair the harnesses or connectors.
3.CHECK IN-VEHICLE SENSOR
Check the in-vehicle sensor components. SEE Component Inspection.
Is the inspection result normal?
YES - INSPECTION END
NO - Replace the in-vehicle sensor.
4.CHECK IN-VEHICLE SENSOR OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect the A/C auto amp. connector.
3. Check continuity between in-vehicle sensor harness connector and A/C auto amp. harness connector.






Is the inspection result normal?
YES - GO TO 5.
NO - Repair the harnesses or connectors.
5.CHECK IN-VEHICLE SENSOR SHORT CIRCUIT
Check continuity between in-vehicle sensor harness connector and the ground.






Is the inspection result normal?
YES - Replace the A/C auto amp.
NO - Repair the harnesses or connectors.




Component Inspection
1.CHECK IN-VEHICLE SENSOR
1. Turn the ignition switch OFF.
2. Remove the in-vehicle sensor. Exploded View.
3. Check the resistance between the in-vehicle sensor terminals. Refer to the applicable table for the normal value.






Is the inspection result normal?
YES - INSPECTION END
NO - Replace the in-vehicle sensor.