1995 GMC Sonoma Owner's Manual - Page 131

Disabling The Theft System 1. Press presets 1 and 4 for 5 seconds with ignition on and radio off. The display will show "SEC", indicating theunit is in the secure mode. 2. Press the SET button. The display will show "000". 3. Enter the first three digitsof the code following steps 6 and 7 of the preceding paragraphs (To Lock the System). The displaywill show the numbers as entered. 4. Press the BAND knob. The radio will display "000'. 5. Enter the secona mree digitsof the code. The display will show the numbers as entered. 6. Press the BAND knob. If the display shows the disabling sequence was successful. The numbersmatched the user-selected code or the factoryback-up code, and the unit is in the UNSECURED mode. If the display shows "SEC", the disabling sequence was unsuccessful and the numbers did not match either of the codes and the unit will remain in the SECURED mode. Understanding Radio Reception FM stereo will give you the best sound. ButFM signals will reach only about 10 to 40 miles (1 6 to 65 km). And, tall buildings or hills can interfere with FM signals, causing the sound to comeand go. The range for most AM stations is greater than for FM, especially at night. The longer range,however, can cause stations to interfere each other. with AM can pick up noise from things like storms and power lines. Try reducing the treble to reduce thisnoise if you ever get it. AM Stereo means the Delco@system can receive C-QUAM@stereo broadcasts. Many AM stations around the countr use C-QUAM@ to produce stereo, though somedo not. (C-QUAM J is a registered trademark of Motorola, Inc.) If your Delco@ system get C-QUAM@, your can "STEREO" light will come on when you're receiving it. Be awarethat hearing damage from loud noise is almost undetectable until it is too late. Your hearing can adapt to higher volumes sound. Sound that of seems normal can be loud and harmful to your hearing. Take precautions by adjusting the volume control on your radio to a safe sound level beforeyour hearing adapts to it. To help avoid hearing loss or damage: 1. Adjust the volume control to the lowest setting. 2. Increase volume slowly until you hear comfortably and clearly. 3-17