2003 Hyundai Elantra Owner's Manual - Page 6

A070A01A-AAT CAUTION: MODIFICATIONS TO YOUR HYUNDAI Your Hyundai should not be modified in any way. Such modifications may adversely affect the performance, safety or durability of your Hyundai and may, in addition, violate conditions of the limited warranties covering the vehicle. Certain modifications may also be in violation of regulations established by the U.S. Department of Transportation and other federal or state agencies. A080A01S-AAT TWO-WAY RADIO OR CELLULAR TELEPHONE INSTALLATION Your vehicle is equipped with electronic fuel injection and other electronic components. It is possible for an improperly installed/adjusted two-way radio or cellular telephone to adversely affect electronic systems. For this reason, we recommend that you carefully follow the radio manufacturer's instructions or consult your Hyundai dealer for precautionary measures or special instructions if you choose to install one of these devices.