Audi A5 - Park Assist Control Unit (Acoustic Parking System)

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Park assist control unit (acoustic parking system)
The new control unit J791
The park assist control unit on the Audi A5 is a new
control unit. This control unit replaces the acoustic
parking system control unit J446 as featured previ-
ously on other models. The park assist system will,
however, not initially be available on the Audi A5.
The park assist control unit is only required for the
acoustic parking system.
The park assist system will make parking even easier
in future: as the vehicle passes a vacant parking
space, the system measures it. After that, all the
driver has to do is press the accelerator, and the nec-
essary steering movements are performed by an
electric motor. A condition for this function is that
the vehicle is equipped with an electromechanical
steering system.
New features
• The park assist control unit is a high-speed dash
panel insert/suspension CAN bus user, and no
longer a convenience CAN bus user like the
acoustic parking system control unit.
• The control unit is supplied with terminal 15
only, and is no longer additionally supplied with
terminal 30. For this reason, it no longer has run-
on capability.
• Operation of the control unit J791 is coupled to
reception of the terminal 15 bit from the conven-
ience system control unit J393. If no set bit is
received via the CAN bus, the acoustic parking
system will not function.
• An MMI is no longer mandatory for the eight-
channel acoustic parking system with visual dis-
play. The third generation radio display can be
used for this purpose. This display is identical to
the display used on the MMI High (colour dis-
play).
• The diagnostic address word has changed: The
new park assist control unit can be addressed
with address word 10 (the acoustic parking sys-
tem control unit had the address word 76).
• When the acoustic parking system is activated
(by selecting reverse gear or pressing the acous-
tic parking system button), the audio volume is
reduced a settable level. After the acoustic park-
ing system is deactivated, the volume is again
increased to the level it was at earlier. Only the
third generation radio presently has this func-
tion. It will be implemented on the MMI at a later
date.
• The acoustic parking system muted when the
parking brake is closed. However, this function is
only available in combination with the front and
rear acoustic parking system, and not with the
rear acoustic parking system.
Park assist control unit (acoustic parking system)