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 are normal.
- Interior room lamp power supply
- Map lamp bulb
- Room lamp bulb

1. CHECK INTERIOR ROOM LAMP CONTROL FUNCTION

CONSULT
1.Switch the map lamp switch or interior room 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

Regarding Wiring Diagram information, Interior Room Lamp Control System.

1. CHECK INTERIOR ROOM LAMP CONTROL OUTPUT

CONSULT
1.Turn ignition switch OFF.
2.Remove all the bulbs of map lamp and interior room lamp.
3.Turn ignition 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. Service and Repair.

2. CHECK INTERIOR ROOM LAMP CONTROL OPEN CIRCUIT

1.Turn ignition switch OFF.
2.Disconnect BCM connector and map lamp connector or interior room lamp connector.
3.Check continuity between BCM harness connector and map lamp harness connector or interior room lamp harness connector.
With map lamp





Is the inspection result normal?
YES- Check that map lamp or interior room lamp has no internal open circuit.
NO- Repair or replace harnesses.

3. CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT-2

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





Is the inspection result normal?
YES- Replace BCM. Service and Repair.
NO- GO TO 4.

4. CHECK INTERIOR ROOM LAMP CONTROL SHORT CIRCUIT-1

1.Disconnect interior room lamp connector or map lamp connector.
2.Check continuity between BCM harness connector and ground.





Is the inspection result normal?
YES- Check that map lamp or interior room lamp has no internal short circuit.
NO- Repair or replace harnesses.