Interior Room Lamp Control Circuit

INTERIOR ROOM LAMP CONTROL CIRCUIT





Description
Controls the following interior room lamps (ground side) by PWM signal
- Front room/map lamp assembly (if equipped)
- Room lamp 2nd row

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.
- Battery saver output/power supply
- Front room/map lamp bulbs (if equipped)
- Room lamp 2nd row bulb
1.CHECK INTERIOR ROOM LAMP CONTROL FUNCTION
CONSULT-III
1. Switch the front room/map lamp assembly (if equipped) and room lamp 2nd row switches to DOOR.
2. Turn ignition switch ON.
3. Select "INT LAMP" of BCM (INT LAMP) active test item.
4. While operating the test item, check that each interior room lamp turns ON/OFF (gradual brightening/dimming).






Is the inspection result normal?
YES - Interior room lamp control circuit is normal.
NO - SEE Diagnosis Procedure.




Diagnosis Procedure
Regarding Wiring Diagram information, Interior Room Lamp.
1.CHECK INTERIOR ROOM LAMP CONTROL OUTPUT
CONSULT-III
1. Turn ignition switch ON.
2. Select "INT LAMP" of BCM (INT LAMP) active test item.





3. While operating the test item, check voltage between BCM connector M20 terminal 63 and ground.






Is the inspection result normal?
YES - Interior room lamp control circuit is operating normally.
Fixed ON-GO TO 3
Fixed OFF- GO TO 2
2.CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, room lamp 2nd row connector and front room/map lamp connector.
3. Check continuity between BCM connector M20 (A) terminal 63 and interior room lamp connectors.





Is the inspection result normal?
YES - Check interior room lamp for an open. If OK, replace the
BCM. Service and Repair. If
NG, replace the interior room lamp. Service and Repair, "Removal and Installation".
NO - Repair the harness or connectors.
3.CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT





1. Turn ignition switch OFF.
2. Disconnect BCM connector M20, room lamp 2nd row connector and front room/map lamp connector.
3. Check continuity between BCM connector M20 terminal 63 and ground.





Is the inspection result normal?
YES - Check interior room lamp for a short circuit. If OK,
replace the BCM. Service and Repair. If NG, replace the interior room lamp. Service and Repair.
NO - Repair the harness or connectors.