Nissan Sentra Service Manual: 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

• Room lamp bulb

• Map lamp bulb

1.Check interior room lamp control function

Consult active test

1. Se the map lamp switch or room lamp switch to door.
2. Turn ignition switch on.
3. Select int lamp of bcm (int lamp) active test item.
4. While 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 INL-45, "Diagnosis Procedure".

Diagnosis procedure

Regarding Wiring Diagram information, refer to INL-17, "Wiring Diagram".

1.Check interior room lamp control output

Consult active test

1. Turn ignition switch OFF
2. Remove all the bulbs of room lamp and map lamp.
3. Turn ignition switch on.
4. Select int lamp of bcm (int lamp) active test item.
5. While operating the test item, check continuity between BCM harness connector 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 and room lamp and map lamp connector.
3. Check continuity between BCM harness connector and room lamp harness connector.

Is the inspection result normal? Yes >> check interior room lamps for an open. If ng, replace lamp in question. Refer to inl-55, "removal and installation" (room lamp) or inl-52, "removal and installation" (map lamp). If ok, replace bcm. Refer to bcs-73, "removal and installation" (with intelligent key), bcs-126, "removal and installation" (without intelligent key).

No >> repair or replace harness or connector.

3.Check interior room lamp control short to ground

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

Is the inspection result normal? Yes >> check interior room lamps for an internal short to ground. If ng, replace lamp in question. Refer to inl-55, "removal and installation" (room lamp) or inl-52, "removal and installation" (map lamp). If ok, replace bcm. Refer to bcs-73, "removal and installation" (with intelligent key), bcs-126, "removal and installation" (without intelligent key).

No >> repair or replace harness or connector.