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I would go after the door lock first. Older fords have a switch on the door lock that disables the alarm. They tend to break and fall though. I have replaced them with a momentary on/ff switch.But the alarm would go off when opening the door. On some older ones(85,87)(no keypad) I could disconnect the security module and it did just fine.
It sounds like the key sensor in the drivers door is malfunctioning, the drivers door is the only door that can enable/disable the alarm, if you try to unlock any of the others it will trigger the alarm.
Sometimes with my Kia I have to (without opening the door), cycle lock and unlock several times before the alarm is disarmed.
Have you tried this is succession, with all the doors locked:-
put the key in the drivers door, turn to lock and then to unlock, the alarm should disarm.
Also, if any of the door locks are jammed, the alarm will still activate when you try to unlock the drivers door.
If that fails and the alarm still activates, then it's a problem with the key sensor in the door.
sounds like you alarm is malfunctioning or shorting out, look under the dash and try unplugging the alarm box and see if this stops the issue. if alarm has engine cutoff it wont start with alarm unplugged. i would test unplugging alarm first and seeing if it stops the issue , then deal with alarm cutoff. It is very common for low end alarm guys to miss wire alarms and over time many issues come up with electrical shorting out, ect.
The alarm must of activated , the alarm is controlled by the locks, go to passenger door and use the key to lock and then unlock the door, this will shut down alarm, you may have to use the passenger door to shut down alarm due to a bad switch in drivers door, this will allow you to start the car, you can also not lock door and alarm may not arm. let me know if the passenger door lock works, good day.
Apparently the "LOCK" function is working normally because the burglar alarm is being activated when you 'lock' the car. Is this right?
The fact the engine won't start when the burglar alarm is activated is NORMAL If the doors will not UNLOCK front the driver's door manual switch, I believe you have a bad DOOR UNLOCK relay in the control module.
Your GM product has a safety alarm, it shuts down the radio , or locks it. I send ours to a GM dealer to get it unlocked. They don't give those codes out.
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