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If it is the OE (original equipment) key fob, meaning if it is the alarm remote control that came with the original purchase of the car it should not need reprogramming. If it is an aftermarket alarm then it may need reprogramming, more information is required to answer the question.
This is a common issue and the most common problem is that the solder joints holding the battery in the proper location. If any of these are broken the remote will not function. It can be fixed with a little solder or if your uncomfortable with doing it yourself, take it to a computer repair store (they can fix it ONLY if you have a broken solder point).
Take the key fob to the closest auto parts store (aka. autozone, o'reilly's, advance) and near the counters they have a key fob testing equipment (FREE). If the remote is working a light will blink when you push the key fob button while close to the testing equipment. If the testing light shows that the fob is working but does NOT unlock your doors, it needs reprogrammed. If the testing light doesn't blink at all, repair or replacement of the key fob is indicated.
Hope this helps and good luck!
1. Locate the valet switch for your system. It's a small black
push button, connected to a pair of wires that are gray and black.
There's no telling where the installer placed it, or if he even left it
connected. But if it's there and you find it:
2. Put your key in the ignition and turn it to the "on" or "run" position (not to "start").
3. While the key is on, press the valet switch once and release it, then press it again and hold it.
Have you tried DEI's web site and go to support and scroll down to where you see installation manuals for that alarm and either save it or print it ( have lots of paper though because the ****** is 56 pages)
First I would check with the installers at Circuit City as to where they would commonly install a valet switch on your model.
As for those that I have installed, their location was an area on the dash that would protect it from being accidentally bumped or hit by normal activity in the front cabin area, easily accessible from the drivers seat. So you may want to search your dash area for a little (most times BLACK) push button, it could be just under the dash or maybe in the glove box.
this "could" be a bad ground, however, usually when these units lose ground, they activate the siren at a really low level, because they are trying to ground through the siren.
I would say to check where the antenna plugs into the main unit,(brain) but honestly, in 17 years of dealing with DEI alarms, 99.9% of these problems are due to the transmitter - it may blink the LED like it is supposed to, but that doesnt gaurantee it is sending a signal. I would recommend buying a new transmitter and programing it to the brain.
That does not sound intierly tru but what is the year ,make and model of your car and i can check for you. but if memory seves me right it just consists of alot of extra work that most tech's dont like to do.