Cabin Temperature Sensor / Switch: Testing and Inspection

In-vehicle Sensor Circuit

COMPONENT DESCRIPTION




In-vehicle Sensor
The in-vehicle sensor is located on instrument driver lower panel. It converts variations in temperature of compartment air drawn from the aspirator into a resistance value. It is then input into the unified meter and A/C amp.







Aspirator
The aspirator is located on driver's side of heater & cooling unit assembly. It produces vacuum pressure due to air discharged from the heater & cooling unit assembly, continuously taking compartment air in the aspirator.

Diagnosis Procedure For In - Vehicle Sensor (Steps 1 - 3):

Diagnosis Procedure For In - Vehicle Sensor (Step 4):

DIAGNOSIS PROCEDURE FOR IN-VEHICLE SENSOR
SYMPTOM: In-vehicle sensor circuit is open or shorted. (22 or -22 is indicated on unified meter and A/C amp. as a result of performing self-diagnosis STEP-2.)

COMPONENT INSPECTION




In-vehicle Sensor
After disconnecting in-vehicle sensor connector M46, measure resistance between terminals 1 and 2 at sensor side, using the table.
If NG, replace in-vehicle sensor.