Pinpoint Test F: The Anti-Theft Alarm Horn Is Always On

Anti-Theft

Pinpoint Test F: The Anti-Theft Alarm Horn Is Always On

Normal Operation

The Body Control Module (BCM) receives voltage for the anti-theft alarm horn from the Battery Junction Box (BJB) fuse 6 (30A). When the perimeter alarm is activated, the BCM (Body Control Module) cycles voltage on and off to the horn causing the anti-theft horn output to cycle in conjunction with the turn signals flashing. The horn is case grounded.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors

- BCM (Body Control Module)

PINPOINT TEST F : THE ANTI-THEFT ALARM HORN IS ALWAYS ON

F1 ISOLATE THE SHORT TO VOLTAGE

- Ignition OFF.

- Disconnect: BCM (Body Control Module) C2280C.

- Ignition ON.

Does the anti-theft alarm horn continue to sound?

Yes
REPAIR circuit CRT02 (GY/VT) for a short to voltage. TEST the system for normal operation.

No
GO to F2.

F2 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.