Activating the Theftlock™ Feature: Notes

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

IMPORTANT: Read all steps before starting the procedure.

If more than 15 seconds elapse between any of the steps, the radio automatically reverts to time and you must start the procedure over from step 4.

If SEC appears on the display in step 4, the system has already been activated.

To change the code, the old code must be removed first.

In order to activate the Theftlock™ system, perform the following steps:

Write down any number from 000 to 1999.
Turn the ignition to the ACCESSORY or the RUN position.
Turn the radio OFF.
Press the 1 and 4 push-buttons together. Hold them down until "- - -"shows on the display.
Press MN for Yukon, Denali / SEEK right button for Escalade and 000 will appear on the display.
Press and hold MN for Yukon, Denali / SEEK right button for Escalade again until the last two digits agree with your code.
Press and hold HR for Yukon, Denali / SEEK Left button for Escalade to make the first one or two digits agree with your code.
Press the AM/FM push button after you have confirmed that the code matches the code you wrote down. If REP appears on the display, repeat steps 5 through 8.
SEC will appear on the display, the radio is now operable and secured.
With the ignition OFF, the Theftlock™ indicator flashes.