Effects of Electromagnetic Interference (EMI) on the Video System
WARNING: This page is about a different car, the 2002 Oldsmobile Bravada, 2002 GMC Envoy XL, 2002 GMC Envoy, and 2002 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
Almost all electric or electronic devices radiate energy in the form of radio waves, also known as EMI. EMI can be produced from such thing as common residential TV antennas, personal hair dryers, microwave ovens, utility power lines, and cellular telephones and other communication devices in passing vehicles.
Not all devices produce the same level of EMI radiation - some very weak, some very strong. However, under the right circumstances, some devices may emit enough EMI that it affects the rear video entertainment system. If the problem persists, check your surroundings for possible EMI sources, such as utility power lines. Wait until the vehicle is clear of the source and try it again.