93 Deville Alarm Issue
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 93 Deville Alarm Issue in Past Cadillac Vehicle Discussion; Hi, I picked up my 93 Deville today from mechanic after it sat for 7 years. 20 Min after I ...
  1. #1
    r_2016's Avatar
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    93 Deville Alarm Issue

    Hi,


    I picked up my 93 Deville today from mechanic after it sat for 7 years. 20 Min after I got home and opened the door the alarm went crazy, key fob would not disable, starting car would not disable; finally the alarm timed out and shut down. Does anyone know what this could be? I have heard that it could be a door switch (it did it on 2 doors; driver and passanger), or maybe a trunk tamper switch? A couple of variables; it only did it when the hood was popped and it did it after I tested the key fob by locking and unlocking doors(they did work) for the first time with the battery being hooked up in 7 years. Maybe something with the battery being disconnected so long? Any help appreciated. Thanks

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    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    It sat for 7 years? Was the battery replaced?

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    r_2016's Avatar
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    Re: 93 Deville Alarm Issue

    The car battery is brand new. The key fobs are old. Another thing I realized is, this car has a remote start and on that remote there is a button for lock/unlock. I am thinking maybe there are 2 alarms and the 2 systems are working against each other. Possible?

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    MoistCabbage's Avatar
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    Yes, possible. I would have any after market system checked/removed before trying to diagnose the stock system.

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    Re: 93 Deville Alarm Issue

    Your factory system alarm (horn honking going nuts and lights flashing), can be turned off by using the door key in the door lock and turning it to unlock.

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    r_2016's Avatar
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    Re: 93 Deville Alarm Issue

    I am not 100% sure that it does have an aftermarket, but there are a few signs; red light on dash; red button under dash. It's funny, I think the aftermarket was disabled before. I had to have the turn signal switch replaced and I am thinking that the guy who replaced it reconnected the wire in the area of the steering column, leading to my issue. I don't know alot about car alarms but my theroy is when I tested the factory fob, it armed both alarms (then door actuators locked); when I unlocked the car, it only disabled the factory alarm, leaving the aftermarket to sound when the door was opened. Since I did not have the aftermarket remote at the time, I could not disable the aftermarket alarm. Is this how it works when 2 alarms are connected; are the hooked up kind of like in-parallel? Thanks

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    MoistCabbage's Avatar
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    There was definitely an after market system installed at some point.

    One fob would not arm both alarms.

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    r_2016's Avatar
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    Re: 93 Deville Alarm Issue

    MoistCabbage: This all started when I tested the factory key fob by locking and unlocking the doors, so my guess would have been that it somehow triggered the other alarm; unless it was the factory alarm that locked up on me. Can you disable the alarm (factory) without it affecting anything else, like the keyless entry or vats? I see in the manual that it is an option, so it can't be mission critical to the car if some of the cars sold did not have it.


    Dennis93Coupe: To tell you the truth, I didn't even think of putting the key in the door. Is that something that is common, where starting the car or using fob will not disable alarm? This car is going to make a liar out of me (car is sitting in mechanics driveway for him to check tomorrow), when we disconnected the battery, it will most likely power-clear the computer. I guess as long as I don't lock the doors with the fob, this won't happen again, lol.



    Thanks guys

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    Re: 93 Deville Alarm Issue

    If it has a factory alarm it is activated when you lock the car with either power door lock buttons in the car or the Cadillac keyfob and it is deactivated by unlocking the doors with either the key or the Cadillac keyfob. Usually if there's an aftermarket alarm installed it can be connected so that it's keyfob will also disable the factory alarm but it usually doesn't work the other way around that the factory keyfobs will control the aftermarket alarm.

    You should wither find out what that aftermarket alarm is and get the proper keyfob for it or have it disconnected.

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    r_2016's Avatar
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    Re: 93 Deville Alarm Issue

    Turning the key to unlock does shut off the alarm, thanks for that info. Is it possible I could just unplug the factory alarm if thats what this issue is? It says in the book that the alarm is an option, so it cant be critical to the car.

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    Re: 93 Deville Alarm Issue

    It says in the shop manual that the theft controller and key-less entry controller are tied together via the door jamb switch and door lock cylinder switch key unlock outputs. I am wondering if the issue might have something to do with one of these switches not getting the signal back to the theft controller when unlocked via key-less entry. Would it still be normal for the alarm to still sound after the car has been started?

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    brougham is offline Cadillac Owners Master
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    Re: 93 Deville Alarm Issue

    Maybe when the aftarmarket parts were installed they somehow disconnected the connection from the factory remote system? That they connected that input to the aftermarket one instead? I'd still disconnect the aftermarket stuff since you have no way of controlling it anyway and maybe in the process of doing that you'll find what's wrong.

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