Pinpoint Test J: The Ambient Lighting Is Always On

Interior Lighting

Pinpoint Test J: The Ambient Lighting Is Always On

Refer to Wiring Diagram Set 89, Interior Lamps for schematic and connector information Electrical Diagrams.

Normal Operation

When the ignition is in any state other than OFF, the Body Control Module (BCM) supplies voltage to the ambient lighting module and the ambient lighting switch.

The ambient lighting also has its own illuminated entry/exit strategy. For additional information regarding this strategy, refer to Interior Lighting Interior Lighting, Illuminated Entry/Exit.

- DTC B12F1:15 (Ambient Lighting Zone 1 Output: Circuit Short To Battery Or Open)- a continuous and on-demand DTC that sets when the BCM (Body Control Module) detects a short to voltage from the ambient lighting module voltage supply circuit.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals, or connectors

- BCM (Body Control Module)

PINPOINT TEST J : THE AMBIENT LIGHTING IS ALWAYS ON

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

NOTE: Under some conditions, the ambient lighting system is active for up to 10 minutes after the ignition is changed to OFF or a door is opened. Make sure the battery saver feature operates correctly before continuing diagnostics.

J1 CHECK THE BCM (Body Control Module) AMBIENT LIGHTING SYSTEM OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280E.

- Ignition ON.

Does the ambient lighting continue to illuminate?

Yes
REPAIR circuit CLN54 (BN/YE) or circuit CLN60 (WH/BN) for a short to voltage. CLEAR the DTCs. TEST the system for normal operation.

No
GO to J2.

J2 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Disconnect all the BCM (Body Control Module) connectors.

- Check for:
- corrosion

- damaged pins

- pushed-out pins


- Connect all the BCM (Body Control Module) connectors and make sure they seat correctly.

- Operate the system and verify the concern is still present.

Is the concern still present?

Yes
INSTALL a new BCM (Body Control Module). TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.