What I think may be occurring is the power draw on the trailer that has the issue is too great for the electrical system on the 2007 Buick Terraza. When you step on the brakes there is more power going to the lights which does not allow them to illuminate correctly.
If the trailer has a lot of running lights this may be causing the issue. Check the vehicle owners manual to determine how much power the tow package can handle and compare that to how much power the lights on the trailer... view full answer...
There is a special circumstance with brake controller installations on the 2005 Buick Terraza. You have to attach the brake controller red wire to a wire at the BCM (body control module) rather than using the wire on the cold side of the brake switch.
The brake light switch sends an input to the Body Control Module (BCM), which activates the high mount stop lamp. The wire that operates the high mount stop lamp can be used to activate the brake control. Connecting to this wire will not... view full answer...
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