Solar Sensor: Testing and Inspection

SUNLOAD SENSOR

Description


COMPONENT DESCRIPTION

Sunload Sensor
Sunload sensor detects sunload entering through windshield by means of a photo diode. The sensor converts the sunload into a current value which is then input into the auto amp.

SUNLOAD INPUT PROCESS

The auto amp. also equips a processing circuit which averages the variations in detected sunload over a period of time. This prevents drastic swings in the air temperature control system operation due to small or quick variations in detected sunload.
For example, consider driving along a road bordered by an occasional group of large trees. The sunload detected by the sunload sensor varies whenever the trees obstruct the sunlight. The processing circuit averages the detected sunload over a period of time, so that the (insignificant) effect of the trees momentarily obstructing the sunlight does not cause any change in the air temperature control system operation. On the other hand, shortly after entering a long tunnel, the system recognizes the change in sunload, and the system reacts accordingly.


Component Function Check


1. PERFORM SELF-DIAGNOSIS STEP-2

Perform self-diagnosis STEP-2. Reading and Clearing Diagnostic Trouble Codes, see Nos. 1 to 3.
Is the inspection result normal?
YES- INSPECTION END
NO- Go to Diagnosis Procedure. .


Diagnosis Procedure


1. CHECK VOLTAGE BETWEEN SUNLOAD SENSOR AND GROUND

1.Disconnect sunload sensor connector.
2.Turn ignition switch ON.
3.Check voltage between sunload sensor harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
NO- GO TO 4.

2. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND AUTO AMP.

1.Turn ignition switch OFF.
2.Disconnect auto amp. connector.
3.Check continuity between sunload sensor harness connector and auto amp. harness connector.





Is the inspection result normal?
YES- GO TO 3.
NO- Repair harness or connector.

3. CHECK SUNLOAD SENSOR

1.Reconnect sunload sensor connector and auto amp. connector.
2..
Is the inspection result normal?
YES- Replace auto amp.
NO- Replace sunload sensor.

4. CHECK CIRCUIT CONTINUITY BETWEEN SUNLOAD SENSOR AND AUTO AMP.

1.Turn ignition switch OFF.
2.Disconnect auto amp. connector.
3.Check continuity between sunload sensor harness connector and auto amp. harness connector.





4.Check continuity between sunload sensor harness connector and ground.





Is the inspection result normal?
YES- Replace auto amp.
NO- Repair harness or connector.


Component Inspection


1. CHECK SUNLOAD SENSOR

1.Turn ignition switch ON.
2.Check voltage between auto amp. harness connector and ground.










NOTE:
Select a place where sunshine directly on it when checking sunload sensor.
Is the inspection result normal?
YES- INSPECTION END
NO- Replace sunload sensor.