Cabin Temperature Sensor / Switch: Testing and Inspection

In-vehicle Sensor Circuit

COMPONENT DESCRIPTION

In-vehicle sensor




The in-vehicle sensor is located on instrument lower panel. It converts variations in temperature of compartment air drawn from the aspirator into a resistance value. It is then input into the front air control.

Aspirator







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

Diagnostic Procedure (Steps 1 - 2):

Diagnostic Procedure (Steps 3 - 4):

DIAGNOSTIC PROCEDURE

SYMPTOM: In-vehicle sensor circuit is open or shorted.

COMPONENT INSPECTION

In-vehicle Sensor







After disconnecting in-vehicle sensor harness connector M32, measure resistance between terminals 1 and 2 at sensor, using the table.
If NG, replace in-vehicle sensor.