30 Minute Learn Procedure
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2004 GMC Yukon XL, 2004 GMC Yukon, 2004 Chevrolet Tahoe, 2004 Chevrolet Suburban, and 2004 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- 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 through 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 CRANK.
- 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.
IMPORTANT:
The vehicle learns the Passlock Sensor Data Code and/or password on the next ignition switch transition from OFF to CRANK. You must turn the ignition OFF before attempting to start the vehicle.