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Eric
Eric, Automotive Repair Shop Manager
Category: Chevy
Satisfied Customers: 30547
Experience:  20+ yrs. experience as repair shop manager and technician.
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How do I reset and anti theft sytem in 1997 Chevy Cavalier?

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How do I reset and anti theft sytem in 1997 Chevy Cavalier?
Hi,

you need to perform the 30 minute GM relearn procedure.

30 minute GM relearn procedure:

1-Turn ON the ignition, with the engine OFF.
2-Attempt to start the engine, then release the key to ON (vehicle will not start).
3-Observe the SECURITY telltale(this is the security light), after approximately 10 minutes the telltale will turn OFF.
4-Turn OFF the ignition, and wait 5 seconds .
5-Repeat steps 1 through 4 two more times for a total of 3 cycles/30 minutes (the vehicle is now ready to relearn the Passlock(TM) Sensor Data Code and/or passwords on the next ignition switch transition from OFF to CRANK). IMPORTANT: The vehicle learns the Passlock(TM) Sensor Data Code and/or password XXXXX the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.
6-Start the engine (the vehicle has now learned the Passlock(TM) Sensor Data Code and/or password).


If, after doing this, the security system still is preventing the engine from cranking, then there is a failure in the Passlock system that can only be diagnosed with a factory level scan tool - either a faulty key, ignition switch or Passlock control module. Unfortunately, this would mean having it towed to a shop at that point.


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