2005 AUDI A6 boot

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Overview
Installation positions of fuses and relays
1 E box in radiator tank, left
2 Relay and fuse holder behind
dash panel, left
3 Fuse holder in dash panel, left
4 Main fuse carrier in radiator tank, right
5 Fuse holder in dash panel, right
6 Relay and fuse holder in the boot, right

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The basic design of the control unit for power
management is the same as the control unit used in
the Audi A8 ‘03.
It is installed in the boot well, next to the battery.
This control unit has been adapted for use in the
Audi A6 ’05 in that it now has revised software,
which shows the battery condition rather than the
battery charge level in the MMI display.
Furthermore, the diagnosis tester can be used to
read out history data, i.e. data relating to the
condition of the on-board power supply in the past.
Convenience electrics
Reference
The basic functions of the control unit for power
management J644 are described in the SSP 287.
Battery condition
The battery condition indicates how efficient the
battery is. The efficiency is determined from the
battery charge level and the ability to start.
Advantages of the battery condition:
– The cut-off stages can be allocated directly to the
battery condition.
– The messages in the central display of dash
panel insert J285 always appear for the same
battery condition reading.
– A 100 % display indicates that no cut-off stage
will be set the next time the engine is switched
off.
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User Car On-board manual
Battery condition
Systems Maintenance
Control unit for power management J644
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1 Door control unit, driver's side J386
2 Control unit for on-board power supply J519
3 Control unit for access and start
authorisation J518
4 Switch for access and start authorisation E415
5 Central locking button for outer door handle,
driver's side E369
Outer door handle switch in driver’s door F272
Sensor for outer door handle contact,
driver’s side G415
6 Antenna read-in unit for keyless access
authorisation J723
7 Antenna on driver’s side for access
and start authorisation R134
8 Door control unit, rear left J388
9 Passenger compartment antenna 1 for
and start authorisation R138
10 Door control unit, passenger's side J38711 Central locking button for outer door handle,
rear left E371
Outer door handle switch, rear left F274
Sensor for outer door handle contact,
rear left G417
12 Central locking button for outer door handle,
passenger’s side E370
Outer door handle switch in passenger’s
door F273
Sensor for outer door handle contact,
passenger's side G416
13 Antenna on passenger’s side for access
and start authorisation R135
14 Door control unit, rear right J389
15 Antenna for central locking and
anti-theft warning system R47
16 Central locking button for outer door handle,
rear right E372
Outer door handle switch, rear right F275
Sensor for outer door handle contact, rear
right G418
17 Boot antenna for access
and start authorisation R137

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Vehicl e ke y
The key has a mechanically coded hinged bit for the
lock cylinder in the driver’s door and the tailgate/
boot lid. The transponder function is integrated into
the electronics and also works without a battery.
An integrated battery powers the electronics for the
radio remote control and Advanced Key functions.
A new feature here is the bi-directional data
exchange between the radio-control key and the
control unit for access and start authorisation via
the antenna for central locking and anti-theft
warning system R47. This is used to transfer the
status of the central locking system into the key.
If a button outside of the function range of the key
is pressed, the LED integrated in the key shows the
lock status of the vehicle. The lock status displayed
is always the status, which was achieved using this
key when central locking was last actuated.
If the vehicle is opened or locked in the interim
period using a second key, this does not change the
lock status in the first key.
Furthermore, the radio frequency is changed from
433 MHz to 868 MHz for the first time in many
countries. This radio frequency is ideal for data
communication between vehicle keys and the
control unit.
Since this frequency can only be used for very short
transmission pulses, any interference from
long-term radio transmitters, such as baby phones,
wireless headsets, etc. is eliminated.
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326_058 Vehicle within key range
Vehicle outside of key range,
last vehicle status is locked Signals from the key LED
Vehicle outside of key range,
last vehicle status is not locked
Approx. 4 seconds on
off
on
off
on
off

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Opening the vehicle
Convenience electrics
326_055 Antenna for
central locking and
anti-theft warning
system
R47
Antenna on driver’s
side for access
start authorisation
R134Antenna on
passenger’s side for
access start
authorisation
R135Passeng er
compartment
antenna 1 for start
authorisation
R138
Boot antenna for
access
start authorisation
R137
Switch for
access and start
authorisation
E415
Antenna read-in
unit for keyless access
authorisation
J723 Control unit for
access and
start authorisation
J518
Door control unit,
driver’s side
J386
Central control unit
for
convenience system
J393Sensor for
outer door
handle contact,
driver’s side
G415

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Starting the vehicle using the button
Convenience electrics
326_056 Antenna for
central locking and
anti-theft warning
system
R47
Antenna on driver’s
side for access
start authorisation
R134Antenna on
passenger’s side for
access start
authorisation
R135Passenger
compartment
antenna 1 for access
and start
authorisation
R138
Boot antenna for
access
start authorisation
R137
Switch for access
and start
authorisation
E415
Antenna read-in
unit for keyless access
authorisation
J723 Control unit for access
and start authorisation
J518
Data bus diagnosis
for data bus
J533Engine control unit
J623 Button for access
and start
authorisation
J408

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The central control unit for the convenience
system J393, with which you may be familiar from
the Audi A8 '03, is used in the Audi A6 ’05. The tasks
and functions have been adapted according to
requirements.
The control unit is a participant on the
CAN Convenience data bus.
Master functions
The master functions of the central control unit for
the convenience system are as follows:
– Direction indicator master
– Central locking master
– Interior lighting master
– LIN master for alarm horn H12 and sensor for
passenger compartment monitoring G273
Other functionalities
In addition to the master functions, other functions
are also available in the central control unit for the
convenience system. The power outputs integrated
in the control unit activate the following loads:
– Back lights
–Rear sun blind
– Rear window heating
– Rear footwell lights
–Boot light
– Tailgate/boot lid release
Ve rs i on s
Two versions of the central control unit for the
convenience system are available:
–Basic
– High-Line (with rear sun blind/anti-theft warning
system/light package for ambient lighting/area
lighting)
Central control unit for convenience system J393
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Installation position
The central control unit for the convenience system
is installed above the battery in the rear right of the
boot.
System overview
Convenience electrics
– Tailgate/boot lid "softtouch"
– Tailgate/boot lid locking cylinder closed
– Brake light switch
– B rake li ght signal from control u ni t fo r ABS with
EDL J104
– Garage door opener (adaptation flashing)– Crash input
– Tailgate/boot lid contact
–Tank plug lock detection (USA)
– Alarm horn H12 (via LIN bus)
– Sensor for passenger compartment
monitoring G273 (via LIN bus)
– Rear footwell lights, left and right
– Boot light
– Motor for rear sun blind V91
– Motor for tank cap locking V155
– Motor for tailgate/boot lid central locking V53
– Interior lighting roof module
– Passenger compartment light
– Alarm horn H12 (via LIN bus)– High-level brake light (LED)
– Tail light, left and right
–Brake light, left and right
– Reversing light, right
–Rear fog light, left
– Number plate light
– Heated rear window Z1
– Rear direction indicator light, left and right
– Level control unit J197
(doors open/closed) The central control unit for the convenience system J393 receives the following input signals:
The central control unit for the convenience system J393 activates the following loads:
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