Radio Unlock Information (Radio Displays "LOC")

UNLOCKING VEHICLE RADIO WITHOUT CUSTOMER UNLOCK CODE

VEHICLES WITH THEFTLOCK OR DELCO-LOC RADIOS ONLY
If the security system is activated and the radio is disconnected from battery power, the radio will display "LOC". 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.