1996 GMC Savana Van Owner's Manual - Page 142

If the code entered is incorrect, SEC will appear on the il display. The radio will remain secured ~ ~ n tthe correct code is entered. When battery power is disconnected from a secured radio, the radio won't turn on and LOC will appear on the display. To unlock a secured radio, see "Unlocking the Theft-Deterrent Feature After a Power Loss" earlier in this section. Understanding RadioReception FM Stereo FM stereo will give you the best sound. But FM signals will reach only about 10 to 40 miles (16 to 65 km). Tall buildings or hills can interfere with FM signals, causing the sound t o come and go. AM The range for most AM stations is greater than for 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 treble to reduce this noise if you ever get it. 3-26