Interior Room Lamp Control Circuit

INTERIOR ROOM LAMP CONTROL CIRCUIT





Description
Controls each interior room lamp (ground side) by PWM signal.

NOTE:
PWM signal control period is approximately 250 Hz (in the gradual brightening/dimming).




Component Function Check

CAUTION:
Before performing the diagnosis, check that the following is normal.
- Interior room lamp power supply
- Map lamp bulb
1.CHECK INTERIOR ROOM LAMP CONTROL FUNCTION
CONSULT-III ACTIVE TEST
1. Switch the map lamp switch to DOOR.
2. Turn the ignition switch ON.
3. Select "INT LAMP" of BCM (INT LAMP) active test item.
4. With operating the test items, check that each interior room lamp turns ON/OFF (gradual brightening/dimming).

On : Interior room lamp gradual brightening
Off : Interior room lamp gradual dimming


Does the interior room lamp turns ON/OFF (gradual brightening/dimming)?
YES - Interior room lamp control circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
1.CHECK INTERIOR ROOM LAMP CONTROL OUTPUT
CONSULT-III ACTIVE TEST
1. Turn the ignition switch OFF.
2. Remove all the bulbs of map lamp.
3. Select "INT LAMP" of BCM (INT LAMP) active test item.
4. With operating the test item, check continuity between BCM harness connector and the ground.





Is the measurement value normal?
YES - GO TO 2.
Fixed ON-GO TO 3.
Fixed OFF-Replace BCM.
2.CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector and map lamp connector.
3. Check continuity between BCM harness connector and map lamp harness connector.





Does continuity exist?
YES - Replace the map lamp.
NO - Repair the harnesses or connectors.
3.CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT
1. Turn the ignition switch OFF.
2. Disconnect BCM connector and map lamp connector.
3. Check continuity between BCM harness connector and the ground.





Does continuity exist?
YES - Repair the harnesses or connectors.
NO - Replace BCM.