2007 Nissan Murano Alarm nightmare
During a cold spell, my Murano's battery went all the way dead. It jumped easily. However - beginning that evening, my alarm would go off in my car repeatedly for no reason. About every 15-30 minutes. I read it could be the battery, so I got a new one. I thought the problem was solved - and it was - for two days. Then it started again! I cannot even manually lock the doors - the alarm will go off randomly all day/night. If I have ANY door unlocked, it happens. All my doors are in sound condition, no shorts - tailgate is closed properly. I've did the "reset" thing with my key fob repeatedly - didn't change anything. I disconnected and reconnected the battery - that didn't do anything. My vehicle does have an aftermarket auto-start system installed. It still work perfectly. I tried using it one day instead of "normal" starting - the alarm still went off after I stopped driving. I've finally just emptied out my car & am forced to leave it unlocked - but that's a bad answer! I simply cannot afford to go to the dealership.
the alarm is triggered by either opening the front or rear door or rear hatch, and detection of battery disconnect and connect. You said it started happening when cold, open and close all your door and hatch, the pin switch in the latches might be frozen. Also check the hood pin switch as well. If that isn't it, it might also be a weak battery in one of your key fobs.
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