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 the diagnosis, check that the following items are normal.
- Interior room lamp power supply
- Map lamp bulb
- Room lamp bulb

1. CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT ACTIVE TEST
1.Switch the map lamp switch to DOOR.
2.Turn 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- .


Diagnosis Procedure


1. CHECK INTERIOR ROOM LAMP CONTROL OUTPUT

CONSULT ACTIVE TEST
1.Turn ignition switch OFF.
2.Remove all the bulbs of following lamps.
-Map lamp
-Room 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 ground.





Is the measurement value normal?
YES- GO TO 2.
Fixed ON-GO TO 3.
Fixed OFF-Replace BCM. Exploded View.

2. CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect the following connectors.
-Map lamp
-Room lamp
3.Check continuity between BCM harness connector, map lamp harness connector, and room lamp harness connector.





Does continuity exist?
YES- Replace the map lamp or the room lamp.
NO- Repair the harnesses or connectors.

3. CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect BCM connector, map lamp connector and room lamp connector.
3.Check continuity between BCM harness connector and ground.





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