2005 Chevrolet Trailblazer Q&A
2005 Chevrolet Trailblazer Question: how do I reset the passlock?
Battery died yesterday. Put new battery in today. Blazer will not start everything seems to be working except it will not start. The passlock system flashes three or four times then stays on steady. Have been told that I need to reset the passlock since I had no power for so long. - drayle
30-Minute Learn Procedure Important: Do not remove the key from the ignition during this procedure. If the key is removed, the procedure will have to be performed from the beginning. Turn ON the ignition, with the engine OFF. Attempt to start the engine, then release the key to ON. The vehicle will not start. Observe the SECURITY telltale. After approximately 10 minutes, the telltale will turn OFF. Turn OFF the ignition, and wait 5 seconds. Repeat steps 1-4 two more times for a total of 3 cycles/30 minutes. The vehicle is now ready to relearn the Passlock Sensor Data Code and/or passwords on the next ignition switch transition from OFF to RUN. Important: The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to RUN. You must turn the ignition OFF before attempting to start the vehicle. Start the engine. The vehicle has now learned the Passlock Sensor Data Code and/or password. With a scan tool, clear any DTCs if needed. History DTCs will self clear after 100 ignition cycles. - Justin Case Auto
Im sorry to tell you.It will only be reset by a dealer Ive had the same problem on my 2007 trail blazer - joemullen03