Self-Study Program

22
Control units
Energy balance of the previous 5 standstill periods
The energy balance and the duration of the previous 5 standstill periods are recorded.
Display on tester
A negative energy balance means that a number of electrical consumers were still active after the engine was
shut off.
This data is very useful if there is no data in the static current history. It is possible to ascertain whether the
battery was loaded or discharged after the engine was shut off.
Data for date/time programming in the dash panel insert
Display on tester
This data can be used to validate the time of reset. The most recent value is always found on the top line in the
history data. The energy management control unit J644 always writes the time and date along with the
current value. The time and date are made available by the dash panel insert on the data bus system. If the
time and date settings are incorrect, an old date will possibly be written along with a new entry.
- 007.1 Ah, energy balance, standstill period in hours: 034.0
- 009.5 Ah, energy balance, standstill period in hours: 063.6
- 000.4 Ah, energy balance, standstill period in hours: 001.2
- 002.1 Ah, energy balance, standstill period in hours: 003.7
- 010.3 Ah, energy balance, standstill period in hours: 004.3
Data for date/time programming in the dash panel insert:
The data record indicates when, and how often the date/time display in the dash panel insert was changed.
In addition, it is possible to check whether the time has been set correctly in vehicles without a radio-controlled clock.
Number of date/time resets in the dash panel insert: 15
Each successive line consists of a time stamp pair. The first time stamp of the pair shows the time in the dash panel insert prior to the reset.
The second time stamp shows the adjusted time after the reset.
Causes of a reset are:
1st cause: battery was disconnected
2nd cause: low battery voltage
2005-06-29, 16:12:00*2005-06-30, 13:00:00
2005-05-01, 13:09:20*2005-05-01, 16:30:00
2005-04-03, 10:22:14*2005-04-03, 12:13:00
2005-02-11. 11:34:00*2005-02-13, 14:05:00
2005-02-01, 12:54:00*2005-02-01, 13:30:00