audio AUDI A6 2005 C5 / 2.G Electrics System Training Manual

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Sound systems
Different sound system versions are available for
the new Audi A6 ´05. A general feature of the
systems is the two subwoofers integrated into the
front doors. A central subwoofer is not installed in
the rear storage area in the Audi A6 ’05 – a standard
feature in other model series.
The base frequencies, which cannot be localised for
the human ear, are amplified by the two tuners in
the doors and are used to round off the audio
pattern in the interior of the vehicle. This saves
space in the rear area, which increases the boot
volume and leaves more room for installing other
control units.
326_059
The new Audi A6 ´05 is equipped with a two-way
loudspeaker system in the front doors as standard.
The related amplifier with two 20-watt drivers is
integrated into the control unit for information J523.
Diagnosis of the standard amplifier module is
performed using the address word 47 in the
VAS diagnosis tester. The possible diagnostic
functions are contained in the list of diagnostic
options for the control unit for front information
J523 on page 78 in this chapter.
326_140
Audi A6 ‘05 front door with subwoofer and loudspeaker installation
positions
1 Control unit for front information J523 including
2x20-watt drivers, front display unit J685 and
Multimedia operating unit E380
2 High-pitch loudspeaker, front left R20 and
mid/low-pitch loudspeaker, front left R101
3 High-pitch loudspeaker, front right R22 and
mid/low-pitch loudspeaker, front right R102
1
23

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BOSE sound system
The new Audi A6 ´05 comes with a BOSE sound
system, which mainly comprises components from
the current Audi A8 ‘03. The division of the
subwoofer function into two individual subwoofers
integrated into the front doors means that the
well-known 7-channel DSP BOSE amplifier must
provide an additional output for the second
subwoofer driver in the front right-hand door. The
line-out output of the amplifier is used for this
purpose. This output signal feeds an external 100-
watt driver, which is integrated into the subwoofer
in the front right-hand door.
The current BOSE amplifier is replaced by a new
development with the launch of the Avant.
All eight drivers for the BOSE sound system are
then integrated into this new Avant amplifier.
Given this, it will be impor tant to note the exact par t
numbers and the related model year when replacing
components of the BOSE sound system in the
future, so that the functionality of the BOSE sound
system is not lost!
BOSE sound system diagnosis
Diagnosis of the BOSE sound system is also
performed using the address word 47 in the
VAS tester.
A basic setting is not required.
The available actuator tests can be performed either
selectively or sequentially.
The AudioPilot microphone, which is integrated into
the BOSE sound system, can be used to absorb
the acoustic pressure produced during the
loudspeaker actuator tests and output this on the
VAS diagnosis tester as a voltage signal.
If a voice operating system is installed, the
microphone for this is also included in the test.
The technician must then compare this voltage
reading with a default reading set at the factory and
evaluate the completed test as either OK or Not OK.
Infotainment
326_060
1 High-pitch loudspeaker, front left R20
2 Middle-pitch loudspeaker, front left R103
3 Low-pitch loudspeaker, front left R21
4 High-pitch loudspeaker, rear left R14
5 Mid/low-pitch loudspeaker, rear left R159
6 Control unit for digital sound package J525
7 Mid-range/treble loudspeaker, centre, R158
8 Microphone unit in front roof module R164
9 Loudspeaker in parcel shelf R150
10 High-pitch loudspeaker, front right R22
11 Middle-pitch loudspeaker, front right R104
12 Low-pitch loudspeaker, front right R23
13 High-pitch loudspeaker, rear right R16
14 Mid/low-pitch loudspeaker, rear right R160
5 4 3 17
2
98
614 13 12 10
11
Note
Always note the exact part numbers when
replacing components of the BOSE sound
system!

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Measured-value blockDesignation
01General: Battery positive voltage
02MOST: MOST address, FOT temperature
03Status of ring break diagnosis line
04System: Analogue/digital unit temperatures in amplifier, fan speed
05Microphone: Microphone voltage(s) for AudioPilot microphone and optical microphone
for voice operating system
50Control unit identification: Manufacturer code
51Control unit identification: Serial number
No.Brief description and designation
of the component to be testedActuator diagnosis
SequentialSelective
1R21Low-pitch loudspeaker, front leftXX
2R23Low-pitch loudspeaker, front rightXX
3R20High-pitch loudspeaker, front leftXX
4R22High-pitch loudspeaker, front rightXX
5R14High-pitch loudspeaker, rear leftXX
6R16High-pitch loudspeaker, rear rightXX
7R103Middle-pitch loudspeaker, front leftXX
8R104Middle-pitch loudspeaker, front rightXX
9R158Centre loudspeakerXX
10R150Loudspeaker in parcel shelfXX
11R159Mid/low-pitch loudspeaker, rear leftXX
12R160Mid/low-pitch loudspeaker, rear rightXX
13Fan in control unitX
14J525Self-test for digital sound package control unitX
Available actuator tests

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Mobile baseplate diagnosis
The mobile baseplate is diagnosed as standard
using the address word 77 in the VAS tester.
A selective or sequential actuator test can be
performed to check the output of the audio signal to
the relevant sound system, radio mute operation,
and whether or not a switched-on phone was
detected.
Measured-value blocks
Measured-value blockDesignation
01General: Battery positive voltage
02MOST: MOST address, FOT temperature
03Status of ring break diagnosis line
05Input signals: PTT, Mobile inserted, Mobile switched on, Communication active
10Reception field strength of the mobile phone
11Status of external antenna for mobile baseplate
14Currently connected Bluetooth devices
19Microphone: Microphone voltage, microphone power consumption
20Number of bonded (known) Bluetooth devices
48Cut-off level of control unit for power management J644
80Control unit identification: Manufacturer codes
81Control unit identification: Serial number
130Status of Bluetooth antenna

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Actuator test
The actuator tests listed in the table can be called
up using the guided fault-finding function in the
diagnosis tester. Most of these can be activated
selectively (individually).
Possible actuator tests
Infotainment
Adaptation channelDesignation
128Basic audio volume
129Mobile after-run time, from 30 seconds to 30 minutes in seven intervals
130Reference channel wait time for synchronisation with audio components
131Microphone-sensitivity
133Bluetooth on/off
134Bluetooth: Handsfree operation only with mobile phone inserted
135Change Bluetooth PIN
136Beep Delay value: Time gap between pressing button and acknowledgement beep
Mobile baseplate adaptation
No.DesignationActuator test
SequentialSelective
1"Phone on" signalXX
2Audio lead adapter setX
3Communication lead to adapter setX