Vehicle malfunctions may also occur if the
vehicle speed sensor signal wire is connected
to radios supplied by other manufacturers.
When other radio units are installed it can have
an effect on the antenna amplifier, since the
original Audi radio units have a remotely driven
antenna (the voltage supply of the antenna
amplifier is driven via a center wire of the high
frequency cable). Use a remotely driven
adaptor parts catalog (vendor: Votex).
Audi A4 Sedan 2002-2004, Audi A4 Avant 2002-2004, Audi A4 Cabriolet 2003-2004 - Communication