Audi A4 8W - The hardware; Mobile communications aerials

38
GPS aerial
In vehicles without a navigation system (MMI Radio plus), the GPS
aerial R50 is connected directly to the connected gateway J533 in
order to determine the location of the vehicle. In vehicles with a
navigation system, J533 receives the GPS data from the informa-
tion electronics control unit 1 J794 via the data bus.
The hardware
Mobile communications aerials
The system has 2 mobile communications aerials. If required, the
aerial with the better mobile reception is used.
The 1st aerial is integrated in the data bus diagnostic interface
J533. The 2nd aerial is located centrally below the dash panel. In
Audi A4 saloons with windscreen heating, the 2nd aerial is fitted
below the parcel shelf.
Speaker
The Audi emergency call is output
through a separate emergency call
module speaker R335 in the driver
footwell.
To implement the vehicle-specific services, a UMTS/GSM-compati-
ble mobile communications module is integrated in the data bus
diagnostic interface J533.
Altogether, the system comprises the following components:
• Mobile communications module integrated in J533
• SIM card embedded in J533
• Driver's side microphone integrated in overhead module
• Emergency call module speaker R335
• Mobile communications aerial integrated in J533
• Separate aerial for emergency call module E263
• Emergency battery A16 in J533
• Emergency call button E276 integrated in overhead module
• Roadside assistance button E275 integrated in overhead
module
• GPS aerial R50
In this constellation, the system is known also as a "connected
gateway".
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