Using the key on method usually works. Make sure the battery is fully charged. Turn the ignition on and leave in the on position for 15 minutes ( not 10 minutes ). After 15 min turn the ignition off and wait 5 seconds. Turn ignition back on and wait 15 min. Sometimes this procedure takes three attempts to work however, two tries is the norm.
Look at some videos on youtube on GM vat's bypass
SOURCE: key fob will not undo
If you don't have one that works for the vehicle now, you'll have to take it to your local dealer to have it programmed to the vehicle. Some will charge for this, some will do it at no charge.
If you do have a remote that is programmed and working for the vehicle, then the following steps will allow you to program another remote:
1. Enter vehicle and close all doors.
2. Put seatbelt on (or clip it into the buckle) to shut the warning buzzer off.
3. Put key in ignition, turn to run position but don't start it.
4. Press and hold the unlock button on the working key fob and hold for 4 seconds, then also press the panic button.
5. Release both buttons and you should hear a single chime to indicate it is in program mode. You have 30 seconds after the chime to program any additional remotes you want to program.
6. Press and release both the unlock and lock buttons simultaneously on the remote you are programming. You should hear another single chime.
7. Within 4 seconds after hearing the chime, press either lock or unlock button on remote that you are programming.
SOURCE: 2002 Ford Focus Doors lock with key fob, but horn does not honk
there are two seperate horns
SOURCE: Audi A4 2003 Alarm Problem
There is a few things to do check the door switches that control dome lights, check wire down by the skid plate when you get oil changed there is a sensor for the starter there if it is stolen the alarm will go off or just take a BAT and BEAT the living **** out of your horn and call it good like I am going to. I hope this helped or will help I recommend an aluminum bat vrs. wood
SOURCE: c240 mercedes key wont turn seems locked
I have a 2001 C240 with the same issue. I removed the positive battery cable from the battery and kept it off for 30 seconds then replaced it. Everything was reset and the key worked.
SOURCE: pt cruiser disable alarm
battery of car is zapped of energy...not sure if alarm system to blame, after driving it for a few minutes..clock and radio display lights turn off, horn can barely be heard...sometimes, motor shuts down completely. have had to put in 2 new batteries in just a matter of 2 months?...any idea what this may be?
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