Pinpoint Test X: The Parking, Rear Or License Plate Lamps Are On Continuously

Parking, Rear and License Plate Lamps

Pinpoint Test X: The Parking, Rear Or License Plate Lamps Are On Continuously

Normal Operation

The Front Lighting Control Module (FLM) sends a message over the High Speed Controller Area Network (HS-CAN) to the BCM (Body Control Module) to indicate the headlamp switch position. When the BCM (Body Control Module) receives a message from the FLM (Front Lighting Control Module) indicating a request for the parking lamps, the BCM (Body Control Module) provides voltage to the parking lamps through 2 circuits.

If the BCM (Body Control Module) receives a message from the FLM (Front Lighting Control Module) indicating a fault with the headlamp switch or the BCM (Body Control Module) loses communication with the FLM (Front Lighting Control Module), the BCM (Body Control Module) defaults all of the exterior lamps on.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- BCM (Body Control Module)

PINPOINT TEST X : THE PARKING, REAR OR LICENSE PLATE LAMPS ARE ON CONTINUOUSLY

X1 CHECK IF THE HEADLAMPS ARE ON

- Ignition ON.

- Observe the headlamps.

Are the headlamps illuminated?

Yes
GO to Pinpoint Test C Pinpoint Test C: The Low Beam(s) Are Always On.

No
GO to X2.

X2 CHECK THE BCM (Body Control Module) REAR PARKING LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280D.

- Ignition ON.

Do the rear parking lamps continue to illuminate?

Yes
REPAIR circuit CBP40 (YE/GN) for a short to voltage. TEST the system for normal operation.

No
GO to X3.

X3 CHECK THE BCM (Body Control Module) FRONT PARKING LAMP OUTPUT CIRCUIT FOR A SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280E.

- Ignition ON.

Do the front parking lamps continue to illuminate?

Yes
REPAIR circuit CBP30 (YE/BU) for a short to voltage. TEST the system for normal operation.

No
GO to X4.

X4 CHECK FOR CORRECT BCM (Body Control Module) OPERATION

- Ignition OFF.

- 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.