My Montana...alarm sounds, doors unlock and the sliding door opens and closes...what's causing this?

Asked by Dec 11, 2013 at 09:04 AM about the 2006 Pontiac Montana SV6 Base Minivan AWD

Question type: Maintenance & Repair

In the middle of the night last night, the alarm sounded, the doors unlocked and the automatic sliding door on the passenger's side opened and closed.  What could be the problem?

2 Answers

4,575

The sliding door motor relay is being energized. The alarm goes off because it's not supposed to be energized while the security system is engaged. So you have to look at the relay. There's either a short, or something has made contact with it. The wiring harness actually goes under the door track on some years. You can disable the door by removing the fuse, for the moment, until you can trace the short.

3 of 3 people found this helpful.

my 08 Montana SV6 is having the same alarm problem, but my doors are manual operators, so no motor. I have been told the body control module has been a problem with this model which could also cause the problem. havent tried it yet, its a pricey part. I would be interested to hear if anyone has intput on this.

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