How can I disengage the security system and make the truck driveable again?

Tiny
A1BIKER
  • MEMBER
  • 1999 GMC JIMMY
  • 190,000 MILES
I went out in the morning and the truck was acting like the battery was low. The charger said the battery was fully charged so I cleaned the posts and tried to start it. Nothing happened and the ignition key would only go back, but not far enough to take the key out of the ignition. No lights show anywhere in the truck, except for the engine light and one other light in the dash, plus the 4 wheel drive choice lights in the dash. I've tried to use the remote to make some kind of dent in it, but nothing is working. The truck is sitting there totally idle and undriveable. Would disconnecting the battery reset my security system if I left it overnight
Monday, November 21st, 2011 AT 2:26 AM

2 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
Does not sound like a security issue. It sounds more like an ignition switch issue. Even if your security system was failing, you would have all other functions except the starter would not work.

Roy
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Monday, November 21st, 2011 AT 2:45 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Password Learn Procedure For Anti-Theft System

Password learn procedure must be performed if Vehicle Control Module (VCM), passlock module or passlock sensor is replaced. A password is communicated between VCM and passlock module to provide engine operation. If VCM is replaced, the VCM must learn the password from the passlock module.
Momentarily rotate ignition switch to CRANK position, but do not start engine. Release switch to RUN position, but do not turn off. Wait 10 minutes and observe SECURITY indicator.
NOTE:Ensure battery is fully charged before proceeding. Ensure steps are followed in correct order or procedure may need to be repeated.

If passlock sensor was replaced, SECURITY indicator will flash for 10 minutes. If passlock module was replaced, SECURITY indicator will flash for a few seconds, then remain on for 10 minutes. If VCM was replaced with a new programmed VCM and connected to vehicle for the first time, vehicle will start and this procedure is not necessary. If replacement VCM was connected to any vehicle at any other time, SECURITY indicator will flash for a few seconds, then remain on for 10 minutes.
Of ignition remains on, SECURITY indicator will transition from flashing on briefly to off after 10 minutes. Turn ignition off and wait 10 seconds.
Repeat programming procedure 2 more times. New security code is ready to be communicated. New password is learned on next ignition switch lock cylinder from OFF to CRANK to ON.
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Monday, November 21st, 2011 AT 2:45 AM

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