1998 Chevrolet Express Van Owner's Manual - Page 157

Activating the Theft-Deterrent Feature The instructions which follow explain how to enter your secret code to activate the THEFTLOCK system. It is recommended that you read through all nine steps before starting the procedure. NOTE: If you allow more than 15 seconds to elapse between any steps, the radio automatically reverts to time and you must start the procedure over at Step 4. 1. Write down any three four-digit number from or 000 to 1999 andkeep it in a safe place separate from the vehicle. 8. Press AM-FM after you have confirmed that the code matches the secret code you have written down. The display will showREP to let you know that you need to repeat Steps 5 through 7 to confirm your secret code. 9. Press AM-FM and this time the display will show SEC to let you know that yourradio is secure. The indicator by the volume control will begin flashing when the ignition is turned off. Unlocki the Theft-Deterrent Feature After a Power Loss ~ 2. Turn the ignition to ACCESSORY or RUN. 3. Turn the radio off. 4. Press the 1 and 4 buttons together. Hold them down Enter your secret code as follows; pause no more than 15 seconds between steps: 1. LOC appears when the ignition is on. until --- shows on the display. Next you will the use secret code number which you have written down. 2. Press MN and 000 will appear on the display. 5. Press MN and000 will appear on the display. 6 . Press MN again to make the lasttwo digits agree with yourcode. 3. Press MN again to make the last two digits agree with your code. 4. Press HR to make the first one or two digits agree with your code. 5. Press AM-FM after you have confirmed that the code matches the secretcode you have written down. The display will showSEC, indicating the radio is now operable and secure. 7. Press HR to make the firstone or two digits agree with your code. 3-22