Buick Repair Questions? Ask a Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose), my normal schedule online is around lunch and after dinner till early morning.
Are you saying the alarm (pulsing horn and flashing light) goes off while driving?
What must you do to stop the alarm?
Is the alarm OEM or aftermarket?
When closing the rear hatch will it close all the way or does it stop about 2 inches shy?
All these issues are going to take extensive diagnostics. So far this looks to be a failure of the body control module. Do you have a scan tool and volt meter and understand wire diagrams?
Please read this:
Thanks for using Just Answer, Chris