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
- Room lamp bulb

1. CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT ACTIVE TEST
1.Switch the map lamp switch and room lamp switch to DOOR.
2.Turn power 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- Refer to "Diagnosis Procedure" .


Diagnosis Procedure


1. CHECK INTERIOR ROOM LAMP CONTROL OUTPUT

CONSULT ACTIVE TEST
1.Turn power switch OFF.
2.Remove all the bulbs of map lamp and room lamp.
3.Turn power switch ON.
4.Select "INT LAMP" of BCM (INT LAMP) active test item.
5. With operating the test item, check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES- GO TO 2.
Fixed ON-GO TO 3.
Fixed OFF-Replace BCM. Refer to "Removal and Installation" Service and Repair.

2. CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT

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





4.Check continuity between BCM harness connector and room lamp harness connector.





Is the inspection result normal?
YES- Replace map lamp or room lamp.
NO- Repair or replace harnesses.

3. CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT

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





Is the inspection result normal?
YES- Replace BCM. Refer to "Removal and Installation" Service and Repair.
NO- Repair or replace harnesses.