2007 silverado 6.6 liter 2500 back up liht beeper

a friend of mine wired a beeper up for when he puts it in reverse. works good. only problem is when he opens the doors the lights come onlike a typical chevy headlights tail lights etc for 30 seconds or so the beeper goes off until they time out. has anybody configured the bcm to pick what lights come on when the doors are opened. never tried. i wont be able to see the truck as hes out of state. he just wants some insight.

Got this off another forum. hope it helps.

www.gmupfitter.com/files/media/photo/474...n_10_18_2013_WIP.pdf

For installation of a Back-up Alarm/Camera on vehicles not equipped with 8S3 (factory back-up alarm) connections can be made at the rear
body junction block (X63A).
In addition to when the vehicle is operated in reverse, the back-ups are illuminated during a lighted exit and as a key fob acknowledgement.
When using the back –lamps circuit to activate a back-up alarm, in which the perimeter lighting feature is set to ON for exiting, the back-up
alarm will be activated during the exit lighting event. To prevent this undesired alarm (or camera) activation during the exit lighting mode use
one of the two options listed below…
1. Have the vehicle’ BCM (Body Control Module) reprogramming with a new calibration that includes RPO (regular production Option)
code SFW. This option will suppress the activation of the Back-up lamps during the exit lighting mode operation.
OR
2. Install an ignition controlled relay to which only allows for the Back-up lamp signal to be provided to the alarm/camera if the ignition
is in the “RUN” mode, and the vehicle is being operated in reverse mode.

thanks a buch. ill forward this to him