Thread: 2005 Grand Prix factory alarm going off randomly. Bypass question

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  1. #1 2005 Grand Prix factory alarm going off randomly. Bypass question 
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    Just bought a 2005 Grand Prix and the factory alarm is going off randomly. I disconnected the battery for now to stop it. Looking for a bypass method. Car has no keyfobs that came with it.

    I've read that Connector 2 pin 24 (purple wire) on the BCM is the factory alarm disarm wire for putting in a remote start. Normally this wire receives a ground pulse when the key is turned in the door to disarm the factory remote start.

    My plan: ground the damn purple wire permanently and call it a day

    Anyone try this before or see a reason why I should not do this? Thanks for any help.
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  2. #2 Re: 2005 Grand Prix factory alarm going off randomly. Bypass question 
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    edit: Connector 2 pin 24 purple wire a - ground pulse disables factory alarm (used to turn off factory alarm before remote start for aftermarket remote start)

    Hoping just grounding this wire will never let the factory alarm arm.
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  3. #3 Re: 2005 Grand Prix factory alarm going off randomly. Bypass question 
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    Very odd Update: Grounded the above mentioned wire and got a reduced engine power light on the DIC. Removed constant ground and the light went away.

    It is the right wire for disarming the factory alarm. if you pulse a ground to the wire it unlocks the doors or at least one of them I heard a door lock actuator cycle but didnt look to see which ones moved. Was also fixing a gas line leak at the plastic connection from the tank to the steel line. Thats fun. I hate gas lines!
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  4. #4 Re: 2005 Grand Prix factory alarm going off randomly. Bypass question 
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    So is this purple wire the one I need to unlock my doors? I have an aftermarket remote start keyless entry alarm system hooked up and got everything working properly. The locks lock when I hit lock and arm but when I hit this arm it just disarms the system and doesn't unlock the doors.
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