The electrical system in your car is designed to perform under reasonable operating conditions without interference between components. Before any additional electrical equipment is installed, it is recommended that you consult your Volkswagen dealer or a reputable repair facility familiar with the vehicle and its systems.
If the vehicle is equipped with mobile radio equipment and/or mobile telephone, it may have an effect upon the operation of the ECM. Radio Frequency Interference (RFI) from the communications system can be picked up by the car's wiring harnesses and conducted into the ECM, giving it the wrong messages at the wrong time. Although well shielded against RFI, the ECM should be further protected by taking the following measures: