Unable to Arm Alarm System - Siren Sounds Genuine Accessory

Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

This diagnostic procedure should be used in the case of the following: The alarm siren sounds within 1 minute of locking, once the alarm system has been armed. The alarm system integrates into the existing vehicle horn system, activating both the vehicle horn and the alarm siren in the event of the alarm system triggering. The alarm system has a horn input signal circuit that is spliced into the horn relay control circuit at the BCM. The alarm system tests the integrity of the horn relay control circuit as part of the systems internal checks prior to arming.

Schematic Reference

Theft Deterrent System Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

1. Ignition OFF, disconnect the BCM harness connector X5.
2. Verify that a test lamp illuminates between the B+ circuit terminal X5-18 and ground.

⇒	If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the alarm module.

For component removal and installation refer to the accessory fitting instructions.