Theft Deterrent (Theftlock (R))

These radios are equipped with THEFTLOCK theft deterrent which, when enabled, causes the unit to be inoperative should it be removed from the vehicle.

The theft deterrent is enabled (SECURE mode) by entering a user-selected code into the unit. This code must be re-keyed into the unit following any interruption of battery voltage to resume normal operations. When battery power is disconnected from a secured radio, the radio will not turn on and LOC will appear on the display. If the correct code is not entered, the unit will become inoperable and remain in the LOCKED mode. Any theft deterrent input mode may be exited by cycling either the radio power or ignition.

Activating Theftlock
1. Write down any number from 000 to 1999 and keep it in a safe place.
2. Turn the ignition to the ACC or the RUN position.
3. Turn the radio OFF.
4. Press the 1 and 4 pushbuttons together. Hold them down until "-" shows on the display.
You are now ready to enter your code. Do not wait more than 15 seconds between each step.
5. Press MIN "000" will appear on the display.
6. Press the MIN push-button again to make the last two digits agree with your code.
7. Press the HR push-button to make the first one or two digits agree with your code.
8. Press the AM/FM push-button after you have confirmed that the code matches the one you wrote down. REP appears in the display, indicating that you need to repeat steps 5-7.
9. Press AM/FM. This time the display will show SEC. SEC means your radio is secure.
NOTE: With the ignition off, the THEFTLOCK indicator will flash.

To Unlock Theftlock After a Power Loss
Enter the user code as follows. Do not wait more than 15 seconds between steps.
1. Press MIN. "000" will appear on the display.
2. Press the MIN push-button again to make the last two digits agree with your code.
3. Press the HR push-button to make the first one or two digits agree with your code.
4. Press the AM/FM push-button after you have confirmed that the code matches the one you wrote down. SEC will appear in the display indicating that the radio is now operable.

If the code is entered incorrectly, SEC will appear on the display. The radio will remain secured until the correct code is entered. If the correct code is not available, the dealer will need to "Dial Delco" or Technical Assistance.

When battery power is removed and later applied to a secured radio, the radio will not turn on and LOC will appear in the display.

Disabling the Theft-Deterrent Feature
Enter the user code as follows; wait no more than 15 seconds between steps:
1. Turn the ignition to ACCESSORY or RUN.
2. Turn the radio off.
3. Press the 1 and 4 buttons together. Hold them down until SEC appears on the display.
4. Press MIN and "000" will appear on the display.
5. Press MIN again to make the last two digits agree with the user code.
6. Press HR to make the first one or two digits agree with the user code.
7. Press AM-FM after you have confirmed that the code matches the user code you have. The display will show "-", indicating that the radio is no longer secured.

If the code is entered incorrectly, "SEC" will appear on the display. The radio will remain secured until the correct code is entered. The radio will not turn on until the correct unlocking code is entered. If the customer code is lost or unavailable, contact your local GM dealership or an authorized Delco radio service center for additional assistance.