Audi
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 data
The 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 discharge
The 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" appears for a short 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
"BATTERY LOW" appears in the central display of the
dash panel insert after the ignition is switched on.
326_061
326_061
326_036
POWER-SAVING
MODE
ACTIVE
BATTERY
LOW
Battery condition
Cut-off levels 1, 2 or 5
Cut-off level 3
POWER-SAVING
MODE
ACTIVE
BATTERY
LOW
Time/Minutes
Cut-off level 6
Time/Minutes
POWER-SAVING
MODE
ACTIVE
12
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