Ambient Sensor Circuit

Ambient Sensor Circuit




COMPONENT DESCRIPTION

Ambient Sensor
The ambient sensor is attached on the hood lock stay. It detects ambient temperature and converts it into a resistance value which is then input into the unified meter and A/C amp.

AMBIENT TEMPERATURE INPUT PROCESS
The unified meter and A/C amp. includes a processing circuit for the ambient sensor input. However, when the temperature detected by the ambient sensor increases quickly, the processing circuit retards the unified meter and A/C amp. function. It only allows the auto amp. to recognize an ambient temperature increase of 0.33 °C (0.6 °F) per 100 seconds.

As an example, consider stopping for a few minutes after high speed driving. Although the actual ambient temperature has not changed, the temperature detected by the ambient sensor will increase. This is because the heat from the engine compartment can radiate to the front bumper area, location of the ambient sensor.

Diagnostic Procedure For Ambient Sensor (Step 1):

Diagnostic Procedure For Ambient Sensor (Steps 2 - 4):

DIAGNOSTIC PROCEDURE FOR AMBIENT SENSOR
SYMPTOM: Ambient sensor circuit is open or shorted.

LED of A/C switch does not illuminate as a result of performing self diagnosis STEP-2.

COMPONENT INSPECTION







Ambient Sensor
After disconnecting ambient sensor connector E34, measure resistance between terminals 1 (Y/G) and 2 (W/G) at sensor side, using the table.

If NG, replace ambient sensor.