Unlocking a Radio That Displays LOC When Code is Known

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.

In order to unlock the Theftlock(TM) system after a power loss, perform the following steps:
1. Write down the users code.
2. Turn the ignition to the RUN position.
3. Press MN for Yukon, Denali / SEEK right button for Escalade and 000 will appear on the display.
4. Press and hold MN for Yukon, Denali / SEEK right button for Escalade until the last two digits agree with the code.
5. Press and hold HR for Yukon, Denali / SEEK Left button for Escalade until the first one or two digits agree with the code.
6. Press the AM/FM push button after you have confirmed that the code matches the one you wrote down. If REP appears on the display, repeat steps 3 through 6.
7. SEC will appear on the display, the radio is now operable and secured.

If the wrong code is entered more than eight times, INOP will appear on the display.

Wait 1 hour before attempting to unlock the radio again.

This time only 3 attempts will be allowed before INOP appears on the display.

If this happens you must wait 1 hour before attempting to unlock the radio again.