1998 Chevrolet Express Van Owner's Manual - Page 158

If you enter thewrong code eight times, INOP will appear on the display. You will have to wait an hour with the ignition on before you can try again. When you try again, you will only have three chances to enter the correct code before INOP appears. If you lose orforget your code, contact your dealer. If the code entered is incorrect, SEC will appear on the display. The radio will remain secured until the correct code is entered. When battery poweris removed and later applied to a secured radio, theradio won't turn on and LOC will appear on the display. Disabling the Theft-Deterrent Feature Enter your secret code as follows;pause no more than 15 seconds between steps: 1. Turn the ignitionto ACCESSORY or RUN. To unlock a secured radio, see "Unlocking the Theft-Deterrent Feature After a Power Loss" earlier in this section. Understanding Radio Reception AM The range for most AM stations is greater thanfor FM, especially at night.The longer range, however, can cause stations to interfere with each other. AM can pick up noise from things like storms and power lines. Try reducing the trebleto reduce this noise if you ever get it. 2. Turn the radio off. 3. Press the 1 and 4 buttons together. Hold them down until SEC shows on the display. 4. Press MN and 000 will appear on the display. 5 . Press MN again to make the last two digits agree with your code. 6. Press HR to make the first one ortwo digits agree with your code. 7 . Press AM-FM after you have confirmed that the code matches the secret code you have written down. The display will show ---, indicating that the radio is no longer secured. FM Stereo FM stereo will give you the best sound, but FM signals will reach onlyabout 10 to 40 miles ( 16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound to come and go.