B2630
B2630, B2631 SUNLOAD SENSORDescription
COMPONENT DESCRIPTION
Sunload Sensor
The sunload sensor (1) is located on the driver's side front defroster grille. It 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 Sensor Circuit
SUNLOAD INPUT PROCESS
The auto amp. also includes a processing circuit which averages the variations in detected sunload over a period of time. This prevents drastic swings in the HAC 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 will vary 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 HAC system operation. On the other hand, shortly after entering a long tunnel, the system will recognize the change in sunload, and the system will react accordingly.
DTC Logic
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
Step 1-2:
Diagnosis Procedure
Step 1-4:
Step 4 (Continued):
Component Inspection
Measure voltage between auto amp. harness connector M37 terminal 7 and ground.
1. Sunload sensor
- When checking sunload sensor, select a place where sunshine directly on it.
If NG, replace sunload sensor.