SOURCE: Car Alarm
sounds like the drivers side key switch has failed remove the interior door panel and there will be a switch attached to the back of the key lock cylinder or around there it should be two or three wires also check the door jamb wire harness where the door closes for any broken or damaged wires, use a vot meter and see if you get power or ground to the opposite side of the switch when you use the key to lock and unlock the door if nothing changes and there is power or ground! at this switch i would replace it, i don't think there is one but if the car has a passenger side key hole try to unlock the car from that side and see if you get the same problem -jeff
SOURCE: lotus elise 2005 fob and key does not work
Re-synchronize the FOB if the problem is with just one key.
1. Hold down both buttons simultaneously until the fob LED goes out. (10 seconds)
2. Release both buttons -- the LED should come on and stay on.
3. Press the larger fob button for a second, and the LED should flash.
IF re-synchronization doesn't work, you may have to replace the fob. Call customer service with your PIN (on the key-card that came with the keys). IF you don't have the PIN, then you need to call customeor service to confirm/register your ownership of the car.
If the keys are re-synchronized and it still doesn't work:
Re-program.
1. Re-synchronize as above, if you have not done so.
2. Turn the ignition on 3 times within 7 seconds. The red light above the odometer should light and stay on for 3 seconds.
3. Enter the PIN. Immediately after the red light goes out as per 2 above, switch on the ignition and count the number of flashes until it equals the number of the first digit on your PIN, then turn the ignition off, then on again. Do this for all four numbers.
4. What a pain, but if you get it wrong on a count, then you can restart by turning the ignition off for 10 seconds.
5. After the fourth digit, if the PIN is correct, the red light will stay on. Then you can re-test the fobs, and it should work.
Otherwise, call customer service.
Hope this helps.
SOURCE: Alarm haywire, can't override anti-theft system or turn on car
The Alarm on my Mercedes ML320 sounded every night, then it started doing it more often, Showed it to the dealer he says it's the 'Tow Sensor', that needs to be repaced. $700, down the drain. I have already started hating this car, it eats $500-600, every 6 months...
SOURCE: can't lock my Honda Accord as alarm goes off when locked
if you have a valet key, stick it it on the passenger side when unlocking door, so it wont alarm while you open the door hope that helps
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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