Possible Passlock Problem

troublechevtroublechev Member Posts: 1
edited December 2015 in Chevrolet
I have a 2004 Cavalier 2.2L with Standard trans. 2 days ago I couldn't find the key that I normally use on this vehicle so I grabbed the spare key (which is original) and had to unlock the door with the key as the fob battery was dead. This started the alarm going as it usually does when I open the door this way. Normally when I insert the key into the ignition lock and turn it to the run position the alarm shuts off, and I;m able to start and operate the vehicle normally. On this occasion the alarm continued to sound and the engine didn't crank. Then I noticed that none of the instrument cluster lights or gauges were coming on. After a while the alarm shut off. The cluster remained dead.

Disconnecting the battery and reconnecting it made no difference. I disconnected the battery for 24 hours without any success. Cluster is dead and no crank.

Checked all fuses, All okay. When I removed the fuse for the cluster and as I just inserted it into the socket, there was a noise from the cluster, and the gauges moved just a little. Then everything was dead again. This happened every time I repeated the process.

I decided to try the 33 minute reset (even though nothing was on (especially the security light). About 3 minutes after the key was turned to the "run" position, there was a clicking sound and the "theft", "brake" and Check Engine lights as well as the odometer flashed randomly for about 30 seconds. This happened a few times during each of the 10 minute periods. However none of the dash lights stayed on. On one occasion, during the clicking and random lighting, I tried cranking the engine. It did crank, but stopped when the clicking/random lighting stopped. At the end of the 30 minutes, nothing was on and the vehicle would not crank.

I then left the key in the run position for 30 minutes. When I got back to the vehicle the check engine light and odometer were on. I cranked the vehicle and it started but stopped immediately. I immediately tried cranking again and it started and stopped immediately again. This time everything went dead.

I'm not sure if this is related to the spare key or if the timing is co-incidental. The normally used key is still nowhere to be found.

I would really appreciate help with this - cannot afford much to repair this vehicle, nor can I afford to get a replacement.


  • Mr_ShiftrightMr_Shiftright Sonoma, CaliforniaMember Posts: 64,482
    edited December 2015
    No easy answer here since possible causes are multiple, but I did find a good resource for you to start some diagnostics. This gives you a description of the system and how it works how to reset it, common failures and repairs that you may be able to do yourself.

    GM Anti-Theft Systems
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