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

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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.
326_072
User Car On-board manual
Battery condition
Systems Maintenance
Control unit for power management J644
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Audi A6 2005>
2005 (5)
Saloon
BBJ 3.0l Motronic / 160 kW Guided fault-finding
Function/component selection
Selecting a function or component
Electrical system (Rep. Gr. 01; 90 - 97)
01 – Self-diagnosis systems
61 – Battery control
J644 – Control unit for power management, Functions
A – Battery, Charge level
A – Battery, Battery testing
J644 – Power management, General description
J644 – Control unit for power management, Coding
J644 – Read out history data
J644 – Power management, Read measured-value blocks
J644 – Power management, Query fault memory
J644 – Data link tests for generator voltage
J644 – Replace control unit
J644 – Power management, Activate/deactivate Transport mode
Battery change history
Data for the last three battery changes is stored.
Power balance history – driving (= engine on)
The power balance and duration of the last five
journeys are logged.
Power balance history – idle (= engine off)
The power balance and duration of the last five idle
times are logged.
Other data is not relevant for Customer Service.
History dataThe diagnosis tester can be used to read out
data from the control unit for power management,
which makes it much easier to analyse the on-board
power supply and the battery.
Open-circuit voltage history
If the battery open-circuit voltage is less than the
threshold values of 12.5 volts, 12.2 volts and
11.5 volts, an entry is written to the history data.
The last four entries can always be read out.
Voltage measurement starts when
– CAN Convenience is in Sleep mode and
– terminal 15 is switched off for at least 2 hours
and
– the vehicle’s power consumption is < 100 mA.
Voltage measurement ends when
– the voltage increases or
– the current increases or
– the control unit triggers Sleep mode or
– the control unit detects a new battery.
Closed-circuit current history
If the closed-circuit current exceeds the threshold
value of 50 mA, an entry is written to the history
data. The last ten entries can be read out.
Current measurement starts when
– CAN Convenience is in Sleep mode and
– terminal 15 is switched off for at least 2 hours
and
– the vehicle’s power consumption is > 50 mA.
Current measurement ends when
– the current decreases or
– the control unit triggers Sleep mode.
Breakdown analysis
If the control unit for power management detects
the status "Cannot start vehicle", an entry is written
to the history data.
Cut-off level history
Data for the last 15 cut-off levels is stored.
Steady battery dischargeThe battery condition is 100 % when the battery is
charged.
As soon as cut-off level 1 is activated, the MMI
"Battery condition" display drops to 90 % and then
goes down to 60 % in steps. If cut-off level 1, 2 or 5
is set when the display reads 90 %, the message
"Power-saving mode active" app ears fo r a sho r t time
on the central display of dash panel insert J285.
In addition, the battery symbol in the dash panel
insert indicates power-saving mode for the entire
load switch-off duration.
As soon as cut-off level 3 is activated, the "Battery
condition" display drops to 50 % and then goes
down to 20 % in steps.
If the battery condition drops to 10 %, cut-off level 6
is active. In cut-off level 6, the message
"B AT TERY LOW" appears in the central di splay of the
dash panel insert after the ignition is switched on.
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326_036
POWER-SAVING
MODE
ACTIVE
BATTERY
LOW
Battery condition
Cut-off levels 1, 2 or 5
Cut-off level 3
POWER-SAVING
MODE
ACTIVEBATTERY
LOW
Time/MinutesCut-off level 6
Time/MinutesPOWER-SAVING
MODE
ACTIVE
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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
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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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326_121
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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Infotainment
Legend

Hardkey
❍Softkey
–Sub-menu
–Function
* available later

Navigation
Navigation
– mode>
– Country
– City/Postal code
– Street
– Special dest.
– Route guidance
Start
–
– Z-destination 1...3
– Destination
❍Memory
–Last destinations
–Top special dest.
– Destination from
address book
– Save current dest.
– Save route
–Load route
❍Route
– Route criteria
–Distance list
–Route with
stop-off destinations
–Route without
stop-off destinations
–Block route
from here
❍Map
–Zoom
–Map menu
❍Nav Info
– Destination
–Location
–GPS dates

Navigation setup
–Map colours
–Alignment
–Junction zoom
–Map type
–Map contents
– Audible directions
–Demo mode
– Delete last
destinations
–Manual location
– Version information

Info main menu
– TMC message list
❍TP memo
– Message retrieval
❍Sources
–
–

Info setup
– TP memo timer
– TMC display filter

Car main menu
❍User
–User 1 - 4
– User management
❍On-board manual
–Short Guide
–Driver’s Manual
–Audi MMI
❍Maintenance
❍Maintenance
– Ambient lighting
–Acoustic Parking
System
– External lighting
– Battery charge level
– Vehicle registration
number
–Windows
– Instrument cluster
– Tyre pressure
control system
– Windscreen wiper
–Seat adjustment
–Mirror adjustment
–Central locking

Setup main menu
–Radio setup
❍Settings
–Menu language
–Units of measure
– Time setting
–System sounds
– Voice operation
– Factory setting
❍Sound
– Balance
–Fader
–Treble
–Base
–Subwoofer
–DSP
– Standard
– BOSE
– Volume settings
– Navigation
instructions
– Traffic
programme
broadcast
– Voice dialogue
system
– Telephone volume
❍Display
–Brightness

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Overview of the measured-value blocks available
for the individual modules
ModuleDesignation
General measured-value blocks
for all modulesGeneral: Battery positive voltage, terminal status
MOST: Address, MOST FOT temperature, optical lowering
Status of ring break diagnosis line
Control unit identification:
Serial number, flash date, hardware and software version
Control unit for front information
J523Multimedia operating unit E380: Status of main buttons, status of knobs/pushbuttons,
volume controller status
Display: LCD display temperature
Signals: Terminal 58D, terminal 58S
Integrated amplifier,
2x20-wattStatus of input signals, status of mute lead, speed (GALA), temperature
Radio RRemote-feed antenna: Open circuit, OK, short circuit
Remote-feed ZF output: Open circuit, OK, short circuit
Transmitter receive-level (0... 100 dBµV)
CD ROM drive R92CD status: Button status (Play, Stop, etc.), Eject button status, status of functions (Repeat, Scan, etc.)
Control unit for navigation
with CD drive J401Route Info: Speed, direction of travel
GPS: Satellites received, status of remote-feed GPS antenna OK, short circuit, open circuit
GPS FIX: GPS information on satellite reception and position-finding
Drive: Status of CD drive, incorrect or no navigation CD inserted, Load Eject error,
CD drive overheating
Status of navigation CD
Longitude corrected: Arc degree, arc minute, arc second
Latitude corrected: Degree of longitude, minute of longitude, second of longitude
Height and angle of direction corrected: Height in metres, angle of direction in degrees
GPS date: Day, month, year or "invalid" if there is no GPS reception
GPS time: Hour, minute, second or "invalid" if there is no GPS reception
Front axle distance pulses, status
GPS level 1: Satellite ID with best and second-best reception
GPS level 2: Satellite ID with third-best reception

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Standard sound system diagnosis
The diagnosis process is effected via address
word 47 as in the case of the series equipment,
however, the separate control unit for digital sound
system, J525, is now addressed. In addition to
reading the measured-value blocks and the fault
memory for all loudspeaker channels involved,
selective actuator tests are also available.
The digital sound system control unit participates in
component protection.
Measured-value blockDesignation
01General: Battery positive voltage, terminal status
02MOST: MOST address, FOT temperature, optical lowering (0 dB, -3 dB)
03Status of ring break diagnosis line
04System: Analogue/digital unit temperatures in amplifier, fan speed
05Microphone: Voltage readings at microphone inputs
50Control unit identification: Year of manufacture, manufacturer code
51Control unit identification: Serial number
No.DesignationActuator test
SequentialSelective
1Mid/high-pitch loudspeaker, front left R26XX
2Mid/high-pitch loudspeaker, front right R27XX
3High-pitch loudspeaker, rear left R14XX
4Mid/low-pitch loudspeaker, rear left R159XX
5High-pitch loudspeaker, rear right R16XX
6Mid/low-pitch loudspeaker, rear right R160XX
9Low-pitch loudspeaker, front left R21XX
10Low-pitch loudspeaker, front right R23XX
Available actuator tests

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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