Flash: Body Control Module (BCM) Updates

Bulletin number

08-028-21

Component

Electrical system

Summary

Flash: Body Control Module (BCM) Updates This bulletin involves reprogramming the BCM with the latest available software. Customers may notice after locking the car, two horn chirps are heard, under normal operation only one horn chirp is heard. Upon further investigation the technician may find the following Diagnostic Trouble Code (DTC):U1413-09 - UAM (Ultrasonic and Anti-tilt Module) - Component Failures.equipped with Premium Security Alarm (LSC Sales Code only). In addition, the customer may notice one or more of the following:Message on the cluster - Headlamp (low beam) is out but the headlamps are all functioning properly.equipped with Bi-Function LED Projector Headlamps (LM6 Sales Code only). Brake lights will intermittently remain on (Only one side which clears and functions normally with a brake apply or ignition cycle). Rear windows are inoperative and will not roll down. Intermittently, unable to turn on high beam headlights.

Owners of these vehicles have filed 27 complaints in the electrical category.