2005 AUDI A6 engine

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Ve rs i on s
The switch for access and start authorisation is
available in the following versions:
– with and without Advanced Key function
– with and without ignition key anti-removal lock
– for radio frequencies of 315 MHz, 433 MHz or
868 MHz
Functions
The switch for access and start authorisation
includes other functions apart from the ignition
switch function:
– Evaluation of the key position of the ignition
switch:
The ignition switch evaluates the ignition key
position using four switches.
The switch information is transferred to the
control unit for access and start authorisation in
binary code via the local bus and also for
monitoring purposes, via two lines.
The lock barrel in the ignition switch is not coded
mechanically, which means that the turning
movement can be performed with every
A6 '05 key.
– Safety branch for the steering lock of the control
unit for access and start
authorisation:
In addition to the switch-offs in the control unit
for access and start authorisation, the voltage
supply for the motor of the electromechanical
steering lock is interrupted in the switch for
access and start authorisation in order to
prevent the steering column locking
automatically.
If terminal 15 is switched on, the voltage supply
is always switched off.
326_066
326_067
Switch for access and start authorisation E415
ULock
326_122Emergency release

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– Reading in position P of the automatic
transmission from the switch for gearbox
position P F305:
The signal is used to activate the integrated,
magnetic ignition key anti-removal lock. If the
vehicle battery is flat, the key can be removed by
pressing the mechanical emergency release.
– Reading in the information from the button for
access and start authorisation E408 (only for
vehicles with Advanced Key):
Fo r s a fe t y r e as o n s , t h e p o s i t i o n s o f t h e b u t to n fo r
access and start authorisation are evaluated by
the switch for access and start authorisation.
–
– Reading in the information from the antenna for
central locking and anti-theft warning
system R47:
The switch for access and start authorisation
passes the data, which the vehicle key sends via
remote control, on to the control unit for access
and start authorisation. The control unit
evaluates the data.
– Reading in the signal from the brake light
switch F (only for vehicles with Advanced Key):
To start the vehicle using the button for access
and start authorisation, the brake pedal must be
actuated.
– Exchanging data with the key using the
integrated read coil:
If a key is inserted into the switch for access and
start authorisation (= S contact on), the
electronics system transmits electric power into
the key via the read coil. The key then sends the
key identification into the switch via the
transponder and the read coil. This sends the
information to the control unit for access and
start authorisation.
Convenience electrics
326_069 326_068
326_065

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The electromechanical steering column lock was
integrated into the control unit for access and start
authorisation.
Functions
– Terminal control:
The control unit for access and start
authorisation puts the information about
terminal 15, 75x, 50, S and P on
CAN Convenience.
The control unit also activates the relays for
terminal 15 and 75x and passes the start request
signal on to the engine control unit.– Locking the steering column:
The motor and gears for locking the steering
column are integrated into the control unit for
access and start authorisation.
The position of the lock is checked using two
integrated micro switches. Terminal 15 is only
switched on after the steering is unlocked fully.
– Immobiliser and component protection:
The control unit is the master for these
functions.
Control unit for access and start authorisation J518
326_095

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– CAN Communication:
The control unit is a participant on
CAN Convenience. Data exchange between all
the components of the access and start
authorisation system is performed via the
control unit.
It is also the diagnosis interface for the
components involved. All data, e.g. code,
immobiliser data, etc. is stored in the control unit
for access and start authorisation.
– Reading in the P/N signal from the control unit
for automatic transmission J217:
The signal is used to activate the displays
relating to engine start in dash panel insert J285.
Convenience electrics
326_062326_063
SELECT
N OR P
TO START
THE ENGINE SELECT
N OR P
START THE
ENGINE

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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.
326_138
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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The control unit is only installed together with the
Advanced Key option.
It is located at the right of the dash panel, behind
the glove compartment.
It evaluates the signals from the outer door handle
sensors and then activates the antennae for access
and start authorisation.
The capacity-based operating sensors in the outer
door handle detect any contact on the handle and
send a signal shortly afterwards to the antenna
read-in unit for keyless access authorisation.
The antenna read-in unit evaluates the signal and
then sends a query to the vehicle key via the
antennae for access and start authorisation.
The sensors switch off after approx. 80 hours once
the vehicle is locked or after 20 actuations without
an authorised key.
Convenience electrics
326_097
Antenna read-in unit for keyless access authorisation J723
Sensors for outer door handle contact G415 - G418
326_096

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Four transmitting antennae are distributed in the
vehicle and are used by the vehicle for radio
communication with the vehicle key. The antennae
transmit on a frequency of 24.5 kHz. The vehicle key
evaluates all four signals and determines the
position in or on the vehicle based on the field
strength of the individual antennae.
The antennae are located:
–in the rear doors
–in the centre console
–in the rear bumper
The start/stop button works in the same way as the
button module, which was first used in the A8 ‘03.
For safety reasons, the button positions are
evaluated both by the control unit for access and
start authorisation and by the switch for access and
start authorisation signal.
Antennae for access and start authorisation E134 - R138
Button for access and start authorisation E408
326_086 326_098

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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