Self-Study Program

18
Control units
Static current history
The previous 10 entries can be read out in the static current history.
Display on tester
An excessively high static current was measured for a total period of 136 hours.
An excessively high static current was measured for a total period of 136 hours.
Total duration with excessively high static current. The total may be larger than the total of the previous
10 entries, because all are counted for the battery which is fitted. This entry is not required for the analysis.
The evaluation of the previous 10 entries is important.
Static current history =
2005-06-27, 11:14:00 * 0001 hours 00.60 A, static current
2005-06-20, 13:36:00 * 0001 hours 00.70 A, static current
2005-06-18, 19:19:00 * 0004 hours 01.00 A, static current
2005-06-10, 14:12:00 * 0002 hours 00.60 A, static current
2005-05-30, 11:47:00 * 0003 hours 00.70 A, static current
2005-05-29, 12:03:00 * 0002 hours 01.20 A, static current
2005-05-21, 10:59:00 * 0005 hours 00.80 A, static current
2005-05-14, 16:52:00 * 0001 hours 01.00 A, static current
2005-04-20, 11:28:00 * 0004 hours 00.60 A, static current
2005-04-18, 10:07:00 * 0002 hours 00.70 A, static current
The previous 10 entries are displayed.
The evaluation of prolonged deviations above the static current is important. If 0 or 1 is displayed for the
duration the deviation above the set value, this means that the duration of the deviation above the set value
was less than or equal to one hour. Such entries can be disregarded because they are caused, among other
things, by the "TP memory function". If the value 0 is displayed for the static current, these are short current
peaks which can be disregarded.
High static currents can be caused by:
– the customer - if electrical consumers such as power supplies or vehicle fridges are connected to the
cigarette lighter supplied via terminal 30.
– the vehicle - in the event of a fault.
If the vehicle is required to have a high static current due to an awake bus system, no entry is made in the
history data under "Static current history" due to non-compliance with the test conditions (convenience CAN
bus must be in Sleep mode).
Test conditions are:
– Terminal 15 OFF for at least 2 hours
– Convenience CAN bus in Sleep mode
– Power consumption greater than 50 mA
The 50 mA current threshold consists of the following components:
– 25 mA max. permissible static current
– 25 mA for possible charging of the anti-theft alarm sounder
When a test is made using express static current measurement, 70 mA is output as the maximum permissible
static current. The difference can be attributed to an additional tolerance of 20 mA.
2005-06-27 , 11:14:00 * 00 hours 00, 60 A, static current
2005-06-27 Date: year, month, day Time stamp
11:14:00 Time: hours, minutes, seconds
00 hours Time in hours which the actual voltage is below the set voltage, e.g.
12.5 V
00, 60 A, static current Battery number