how do I check to see if the resistance value of the key is being read?
I had a key made at ACE hardware for my wife (several months of use went by before the first happening); the car has not locked up when using my key. I have substituted my key for hers, after the fact, and it didn't unlock the system.
From what I have read there are factors other than the key being the culprit. The owners manual references what is happening:
"Universal Theft Deterrent( Option)
If your Pontiac has this option, it has a theft deterrent
alarm system. With this system, the SECURITY light
will flash as you open the door (if your ignition is off).
This light reminds you to activate the theft deterrent
system when leaving your vehicle.
Activating the system:
1. Open the door.
2. Lock the door with the power door lock switch or
Remote Keyless Entry transmitter. The SECURITY
light should come on and stay on.
3. Close all doors. The SECURITY light should go off
after about 30 seconds and the system will then be
If the SECURITY light comes on for one minute and
then shuts off while the ignition is on, the security
system has detected a problem with itself. See your
dealer for service.
If a door or the trunk is opened without the key or
Remote Keyless Entry transmitter, the alarm will go off.
It will also go off if the trunk lock is damaged. Your
vehicle’* lamps will flash and the horn will sound for
three minutes, then will go off to save battery power.
Remember, the theft deterrent system won’t activate if
you lock the doors with a key or manual door lock. It
activates only if you use a power door lock switch or
Remote Keyless Entry transmitter.
Avoid setting off the alarm by accident.
If you don’t want to activate the theft deterrent system,
the vehicle should be locked after the doors are closed.
Always unlock a door with a key, or use the Remote
Keyless Entry System transmitter.
Unlocking a door in another way will set off the alarm.