GMC Troubleshooting Questions? Ask a Mechanic for Answers
by thealarm do you mean the security light? or does this vehicle have an aftermarket alarm installed?
okay so you are referring to the security light on the dash? does it crank ?
so to reset the security you need to follow this procedure
turn the key to start like normal and then let the vehicle sit in the on position for 10 minutes. then off for 10 seconds.
repeat that procedure two more times. on the forth turn of the key the vehicle will start.
Hi there, I am Cam. Do you still need help? If so, we need to get your cluster working to see the reaction from the security light. Performing the relearn blind may not be accurate.