Volkswagen Passat W8, Service Manual, Page: 43 / 52

43
Function
The radio signal received from one of the four
aerials runs via an aerial switch circuit inside the
aerial selector control unit to the tuner. In the
tuner, the signal quality is checked and the result
is fed back to the control unit via an aerial output
line. If the selected signal is too weak for tuner
reception, the aerial switch switches
automatically to the next of the four aerials.
This process is repeated until an aerial is found
with good reception. Switchover is so fast that the
car occupants do not notice it.
Side window
left
AM/
FM 1
FM 2
FM 3
FM 4
Side window
right
Function diagram for aerial system (example: Passat estate)
This aerial system is currently offered with the "Delta" radio system.
Control unit J515
Terminal 30
Switch
The control unit for aerial selection J 515
is located under the rear shelf on the saloon or
on the rear left wheel housing in the luggage
compartment of the estate. Its function is to
switch over to the aerial with the best reception.
Aerial inputs
Output to
tuner
Power supply
Input from
tuner
S261_059
S261_060