Audi 243 Service Manual page 36

Control concepts
Sleep mode
To minimise electricity consumption the
control unit switches to "system idle" (sleep
mode) after 15 minutes.
There is no level adjustment in sleep mode.
"Wake-up" is primarily triggered by the door
contact signal. If the door contact signal fails,
the system is activated when the ignition is
switched "ON" or by the driving speed signal.
Lifting platform mode
The control unit evaluates the level signals
while a stationary vehicle is being lowered
and thereby initiates lifting platform
operating mode.
The aim of the lifting platform mode is to
prevent excessive discharge of the air springs
when the vehicle is completely raised.
The vehicle should be raised as quickly
as possible in order for the control unit
to recognise the lifting-platform mode.
It is often advisable to switch off the
system during repair work (e.g. during
axle measurement or if the pressure
lines have been detached, in order to
prevent the compressor running
unnecessarily).
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The system can switch between sleep mode
and run-on/run-up mode, triggered via the
door contact signal, a maximum of 15 times.
For the 15 subsequent wake-up procedures,
the system switches to sleep mode after only
1 minute.
The system can then only be activated via
terminal 15 and/or the speed signal.
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