Quote:
Originally Posted by AussieinNC
To reset Your 2002 Chevy Silverado security system put the key in the ignition, turn the key to the on position, and leave it on until the security light goes out.
Usually abut 15 mins.
Once this happens crank the truck without turning the key backward, just turn to start.
This will reprogRam the transponder from the ignition switch.
To prevent someone from using a fake or non-registered key, GM installed an anti-theft system called Passlock.
When the wrong key or other tool is used to crank the ignition, the Passlock system disables the truck's fuel system.
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so this works on some but most time its a 30 mins relearn so connect a charger to the battery
,1. Insert a master key (black head) into the ignition switch.
2. Turn key to the “ON ” position without starting the engine. The security light should
turn on and stay on.
3. Wait for 10 minutes or until the security light turns off.
4. Turn key to the “OFF ” position for 5 seconds.
5. Turn key to the “ON ” position without starting the engine. Security light should turn
on and stay on.
6. Wait for 10 minutes or until the security light turns off.
7. Turn key to the “OFF ” position for 5 seconds.
8. Turn key to the “ON ” position without starting the engine The security light should
turn on and stay on.
9. Wait for 10 minutes or until the security light turns off.
10. Turn key to the “OFF ” position. The key transponder information will be learned on
the next start cycle.
11. Start the vehicle. If the vehicle starts and runs normally, the relearn is complete.
12. If additional keys need to be relearned, turn the key to the “OFF ” position.
13. Insert the next key to be learned. Turn the key to the “ON ” position within 10
seconds of removing the previously used key.
14. Wait for security light to turn off. It should happen fairly quickly. You may not notice
the lamp as the transponder value will be learned immediately.
15. Repeat steps 12 through 14 for any additional keys