2001 Chevrolet Impala Owner's Manual - Page 216

Backglass Antenna Your AM FM antenna is integrated with your rear window defogger, located in the rear window. Be sure that the inside surface of the rear window is not scratched and that the lines on the glass are not damaged. If the inside surface is damaged, it could interfere with radio reception. If you choose to add a cellular telephone to your vehicle, and the antenna needs to be attached to the glass, be sure that you do not damage the grid lines for the AM FM antenna. There is enough space between the lines to attach a cellular telephone antenna without interfering with radio reception. Vehicle Customization Settings Your audio system can be used to control vehicle customization settings using the DISP button when the radio is off. See "Vehicle Customization Settings" in the Index. NOTICE: Do not try to clear frost or other material from the inside of the rear window with a razor blade or anything else that is sharp. This may damage the rear defogger grid and affect your radio's ability to pick up stations clearly. The repairs wouldn't be covered by your warranty. Because this antenna is built into your rear window, there is a reduced risk of damage caused by car washes and vandals. Chime Level Adjustment The radio is the vehicle chime producer. To change the volume level, press and hold pushbutton six with the ignition on and the radio power off. The chime volume level will change from the normal level to loud, and LOUD will be displayed on the radio. To change back to the default or normal setting, press and hold the pushbutton six again. The chime level will change from the loud level to normal, and NORMAL will be displayed. Each time the chime volume is changed, three chimes will sound as an example of the new volume selected. Removing the radio and not replacing it with a factory radio or chime module will disable vehicle chimes. 3-46