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Battery: Make sure the battery in your key fob is not dead or low. If the battery is weak, it may not be sending the correct signal to the alarm system, causing it to disarm.
Programming: Check that the alarm system is programmed correctly. Make sure the system is set to arm in the mode you want (such as "silent" or "beeping"), and that the alarm is set to trigger when the appropriate sensor is triggered (such as door, window, or motion sensors).
Faulty Sensor: There may be a faulty sensor that is causing the alarm to disarm. Check that all sensors are working correctly and not causing false alarms or malfunctions.
Interference: Interference from other wireless devices or nearby radio signals can cause your alarm system to malfunction. Make sure there are no other wireless devices nearby that could be interfering with your alarm system's signal.
It is used for programing the alarm, it is used to disarm the alarm without the remote, [in case remote is damaged] and it is used to put alarm system into valet mode, [service mode] valet mode is only really needed if the alarm has been programed for passive arming, [alarm arms itself].
Your main use for the valet switch, [if programed for active arming instead of passive arming] is to have a way to disarm the alarm if the remote does not work.
Open door, turn ignition on then off. Press aand hold programming button until you hear one chirp. After you hear the chirp, release programming button, press and release button one then press and hold. You will hear one chirp. While holding the programming button, press lock button on remote to change option. One chirp is active arming(what you currently have), Two chirps is passive arming without locks, Three chirps is passive arming with locks. Turn ignition on to exit programming. Test system.
this alarm works with the remote and the key, if you lock with the key it arms if you lock with remote it arms,when you unlock it it should disarm, if your having a problem with it not working try the pass/side lock with key, that should shut it down but if it keeps rearming without locking doors then it may be aftermarket, also in your manualy it will show you that some factory alarms are also self arming this is programed through the cluster, using the buttons on the dash, you scroll through the options and shut off auto arming, this is done the same way you scroll for mileage or trip time or oil change life. hope this helps.
-press the "f" button and hols for 12 seconds (ignore the beep at like 4 seconds.)
-press and hold the unlock button for 2 seconds...the remote should beep two times. each feature that is active will have an led light beside it. press the button to activate the feature. if the light is on the feature is on...
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.
I'll assume you used the remote here (like most of us do) to arm the alarm. Try turning the key in the door lock - turn it to lock the car (which arms the alarm), and then unlock it (which should disarm it). Do this a couple of times if need be, and it should disarm and allow you to start the car.
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