B2630

B2630, B2631 SUNLOAD SENSOR





Description

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
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 seconds before conducting the next test.
- GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON (READY) and wait at least 5 seconds.
2. Check DTC.

NOTE:
Perform DTC confirmation procedure under sunshine. When performing indoors, aim a light (more than
60 W) at sunload sensor, otherwise B2631 will indicate despite that sunload sensor is functioning properly.
3. Select "SELF-DIAG RESULTS" mode with CONSULT-III.
4. Touch "ERASE", and recheck DTC.
Is DTC detected?
YES - Go to Diagnosis Procedure. SEE Diagnosis Procedure.
NO - Inspection End.




Diagnosis Procedure
Regarding Wiring Diagram information, [1][2]Electrical Diagrams.
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 M56 terminal 1 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 M56 terminal 2 and auto amp. harness connector M37 terminal 26.





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. SEE Component Inspection.
Is the inspection result normal?
YES - Replace auto amp. Service and Repair.
NO - Replace sunload sensor. Service and Repair.
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 M56 terminal 1 and auto amp. harness connector M37 terminal 7.





4. Check continuity between sunload sensor harness connector M56 terminal 1 and ground.





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




Component Inspection











Measure voltage between auto amp. harness connector M37 terminal 7 and ground.

- When checking sunload sensor, select a place where sunshine directly on it.





If NG, replace sunload sensor. Service and Repair.