2001 AUDI A4 tow

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55
The hazard warning flasher signal is control-
led separately by the vehicle electrical system
control unit, via the hazard warning flasher
button.
If, during hazard warning flashing, the turn
signal flasher is actuated, e.g. during towing,
the hazard warning lights lose their priority
for this period.
The turn signal clicking is generated by an
integral acoustic relay in the dash panel
insert.
Turn signal/hazard warning light control
The functions:
– Anti-theft alarm flasher
– Central locking system flasher when
opening/closing
– Key-learn flasher for key adaption
– Crash flasher
– Panic flasher (USA only)
are specified by the central convenience elec-
tronics and transmitted via the convenience
data bus to the vehicle electrical system con-
trol unit, which then executes the "com-
mands".
The signal for turn signal flashing or motor-
way flashing is output via the steering column
switch module and executed by the vehicle
electrical system control unit.
For active hazard warning flasher with
ignition OFF, the flasher bulbs are actu-
ated for a shorter period in order to mini-
mise current consumption.
Motorway flashing is detected by the vehicle
electrical system control unit when the turn
signal lever is pressed and this triggers a tri-
ple turn signal flash.

Turn signal light, right
Turn signal light, left
Turn signal light, right
Turn signal light, left
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SSP254_078

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In the basic version without rear electric win-
dow lifters, central locking control of the rear
doors is assumed by the central convenience
electronics.
Convenience system
The convenience system previously used in
the Audi A2 is also used in the Audi A4.
In the series version, the following additional
functions
– Door warning lights
– Radio remote control
and in the optional version, the following
functions
– Anti-theft alarm with interior monitor and
towing protection (new)
– Electric sliding/tilting/glass sun roof
– Footwell lights
– Exit lights
– Mirror fold-in function
– Mirror memory function
are included in the Audi A4.
Electrical system
Central convenience unit J393
Door control unit,
passenger’s side J387 Door control,
driver’s side unit
J386
Door control unit,
rear right J389
(optional) Door control unit,
rear left J388
(optional)
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62
TS

Electrical system
The Audi A4 convenience system is available
with
– Anti-theft alarm
– Ultrasonic interior monitor
– Shattered glass sensor (Avant)
– Towing protection
as optional extras.
The anti-theft alarm is only activated when
the vehicle is locked via the radio remote con-
trol and by closing the driver's door.Deactivation is performed by
– opening the vehicle via the radio remote
control or
– opening the vehicle via the driver’s door
lock cylinder and switching on the ignition
within 15 seconds. If this time period is not
observed or if the key used is not stored in
the immobiliser, the alarm is triggered.
Data exchange between the immobiliser in
the dash panel insert and the central conven-
ience electronics takes place via the conven-
ience data bus.
Anti-theft alarm with interior monitor
High and low pitched tones
- air horn (sounder) Central control unit for con-
venience system J393Ignition steering
lock D Door lock
Convenience data bus
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63
An innovation in the anti-theft alarm is that a
sounder with an integrated battery is fitted in
place of the horn.
This enables the alarm to sound even when
the power supply has been interrupted.
The ultrasonic interior monitor and the tow-
ing protection can be switched off from
inside the passenger compartment by means
of a switch.
Diagnostics
The angles of the both the longitudinal and
transversal inclination of the inclination sen-
sor are displayed in the measured value
block.
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SSP254_135

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64
Functional mechanism of inclination sender
Towing protection is achieved by means of
the inclination sender installed in the central
convenience electronics.
The functional mechanism of the inclination
sender is based on the determination of
resistance changes relating to the volumetric
fluctuation of a viscous electrically conduc-
tive fluid.
Electrical system
SSP254_110
The resistance is stored at the moment of
activation of the anti-theft alarm.
Changes in the position of the inclination
sensor caused by one-sided lifting of the
vehicle alter the resistance. The alarm is trig-
gered.
The angle of inclination can be displayed in
the measured value blocks.
Sub-com-
partment
Ceramic
housing
Indicator
fluid
Electrodes
Operational
amplifier

Variously arranged electrodes project into
this fluid.
Alternating fields are applied to the elec-
trodes of the sender, which is divided into
sub-compartments.
When a change in position occurs, the distri-
bution of the fluid in the chambers also
changes.
As the level of the liquid in the sub-compart-
ments changes, the resistance determined for
the sub-compartments via the electrodes also
changes.
Electrode
connections
SSP254_111