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Mobile communications module
The UMTS/GSM-compatible mobile communications module is
responsible for data transfer to the Audi server as well as the voice
connection during emergency and roadside assistance calls.
SIM card
This particular SIM card is an embedded SIM card, and not a
standard insertable SIM card. It is known also as an e-SIM (embed-
ded SIM). The e-SIM itself cannot be replaced separately. If neces-
sary, the data bus diagnostic interface J533 must be replaced.
Emergency battery
This is required to power the Auto SOS function. The emergency
battery comprises 2 special rechargeable batteries and can be
purchased through Audi Original Parts.
The emergency battery is kept continuously charged during normal
vehicle operation. The emergency battery has a fixed replacement
interval of 7 years.
Button
The emergency call button E276 and the roadside assistance
button E275 are installed in, and evaluated by, the front overhead
module. Their signal is sent via LIN bus to the electrical system
control unit J519 and then relayed via the data bus to the diagnos-
tic interface J533.
The emergency call button has an integrated green-red LED which
indicates the following states:
• Green: function available
• Flashing green: function active
• Red: function unavailable
The roadside assistance button has an integrated red LED which
lights up as soon as the roadside assistance call is activated.
Microphone
Audi emergency and roadside assistance calls are routed through
the microphone on the driver's side only.
This is the microphone which, without connected gateway J533, is
otherwise connected directly to the information electronics control
unit 1 J794. The microphone signal is relayed from J533 to J794
during a normal telephone call.
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