Does it have an alarm?

get a new battery for the remote

Put key in ignition, turn all the way forward, but not trying to start. Let alarm cycle 2 times, when it stops the 2nd time, remove key and alarm should be disarmed. This will only work if it is a factory alarm.

This is the aftermarket alarm may be time for a new set but before you go that direction the alarm light may have shorted to a power and not affecting the alarm itself by the way does the alarm horn work and is it diconnected because if it is it realy activated. If it isnt and alarm horn works but the light always stays on the the alrm internal relays doesnt switch over. The fix most area will make you get a whole new one

My Car Alarm Won't Work By HilaryPost, eHow Contributor updated: October 10, 2010 Troubleshooting a car alarm problem doesn't have to be hard. Fotolia.com">car keys image by bright from Fotolia.com

Troubleshooting a car alarm is relatively easy. You don't even need any tools or manuals to figure out what's wrong. Though car alarms are meant to protect the safety of your car, they can sometimes provide problems of their own. With these simple steps, you can find out what the issue is and attempt to fix it. Common car alarm issues include: your alarm not working, your alarm going off at inappropriate times and your alarm failing to activate itself. You can solve your car alarm's problems by following these easy troubleshooting steps.
Difficulty: Moderately Easy Instructions

1. 1

   Do a routine check of all your car's systems. Sometimes, other parts of the car are causing the problem. Don't assume it's your car alarm before a thorough check. For instance, if you car will not start, there is probably something wrong with your battery or starter.
   

2. 2

   Disable your alarm manually. You may have to set the alarm to valet mode while you diagnose the problem. To do this, put the key in the ignition and press down on the push key until the light on the switch stays a solid color.
   

3. 3

   Check your sensors. Sometimes your car alarm will go off at inappropriate times if your sensor is too sensitive. Just adjust your settings to fix the problem.
   

4. 4

   Turn off or disconnect any other devices you have in your car. Often, radar detectors, GPS devices and cell phones can interfere with your car alarm system. It's
   

have a good day

you need a satelite

that is incorrect the alarm is jsut like any other it should only sound if there is a problem, which in this case there is, whoever you bought the car from is lying to you, i would have to say that the contrl module for passive alarm is bad

First question , is it a FACTORY alarm or an AFTER MARKET alarm. Regardless, I haven't met an alarm yet, that protects the radio.. My guess is, that if it is an aft/market alarm, inadvertantly placed the system in the "VALET" where it doesn'i work. Let me know if you disconnected battery, and are there alarm toggle switches.

use the key and unlock the trunk...if that doesnt work do the passenger door...that should reset the alarm...

The installations of alarms I have seen over the years were with few exception very very poorly done, and always the cause of the electrical issues like yours and 100's of other problems, the alarm installer always denied there alarm was at fault, but when I restored the factory wiring the problems went away, HUM!, I will bet if you restore the wiring that everything will work again as designed.

I had problems with an alarm. the ground wire was loose. i deactivated it by disconecting the ground wire. when i repaired the ground connection. it worked well.