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.
- Battery saver output/power supply
- Front room/map lamp assembly bulbs
- Personal lamp rear bulbs
- Foot lamp bulbs

1. CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT
1.Switch the front room/map lamp assembly 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).
ON: Interior room lamp gradual brightening
OFF: Interior room lamp gradual dimming
Is the inspection result normal?
YES- Interior room lamp control circuit is normal.
NO- .


Diagnosis Procedure

Regarding Wiring Diagram information, Interior Room Lamp Control System.

1. CHECK INTERIOR ROOM LAMP CONTROL OUTPUT

CONSULT





1.Turn ignition switch OFF.
2.Select "INT LAMP" of BCM (INT LAMP) active test item.
3.While operating the test item, check voltage between BCM connector M17 terminal 19 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 M17, front room/map lamp assembly and foot lamp connectors.
3.Check continuity between BCM connector M17 terminal 19 and each interior room lamp connector.





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

3. CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT






1.Turn ignition switch OFF.
2.Disconnect BCM connector M17, front room/map lamp assembly and foot lamp connectors.
3.Check continuity between BCM connector M17 terminal 19 and ground.





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