5 Series E39 520i (M52) SAL
At points where the inaccuracy can be reproduced, the fault is in the data material of the
CD roadmap.
Concerning fault pattern 2:
This fault pattern is an intermittent faulty correction value for the temperature-dependent
drift of the rotation rate sensor (gyro) in the navigation computer. This characteristic has an
unfavourable effect in navigation computers whose rotation rate sensors have higher drift
values in certain temperature ranges.
The rotation rate sensor (gyro) is built into the navigation computer and supplies an output
signal that is proportional to the angular velocity of the vehicle. This signal is subject to
thermal drift, which
•
must not exceed certain tolerances, and
•
must be compensated for by software algorithms in the navigation computer.
As the rotation rate sensor detects angular velocity between uphill and downhill sections in
the same way as it does in corners, this complaint also occurs when driving on winding
mountain roads. Moreover, a comparison with the roadmap is made difficult by the 2-
dimensional projection of the
3-dimensional terrain. This is a conceptual shortcoming and does NOT constitute a fault.
Affected
vehicles:
E38, E39, E46 with navigation system (option 609) or
E46 with radio navigation system (option 606)
Manufacturing period: September 1997 to September 1999
Procedure:
Concerning fault pattern 1:
Check with the customer precisely how the fault makes itself shown.
If possible, exact details of the geographical location and the distances given should be
recorded.
If the problem can be reproduced at certain crossroads:
Complete correction form as described in SI 65 04 97 (214) and return it to the subsidiary
responsible for your country.
The problem is caused by an inaccuracy in the data material of the CD roadmap. The notes
on the correction form can be used by the publisher of the CD roadmap (NavTech) to check
and correct the data.
If the problem cannot be reproduced at certain crossroads:
Check the navigation system operating software and update as necessary.
The calibration algorithms have been improved from the following software statuses:
"28" for navigation system (CD BMW Navigation V12),
"25" for radio navigation system (CD BMW Navigation V11).
The operating software is shown in the "Settings" menu:
Current values are, e.g.:
"2-1/30" for navigation system (option 609)
"2-2/40" for radio navigation system (option 606)
Here, the numbers "30" and "40" stand for the respective software status and correspond to
current version of the operating software "CD BMW Navigation V14". Please refer also to
IDC 028/99-10.
No further improvement to the calibration algorithms in the operating software is available
at present. It must be taken into consideration that all sensors, all measured values and the
roadmap data material contain inaccuracies which can lead to deviations from the
calculated position. This is a conceptual shortcoming and does not constitute a fault.
All navigation systems which compute a position in this manner and which have the same
sensors (rotation rate sensor, distance sensor with automatic calibration using GPS and
SI Position inaccuracies in navigation system E38 E39 E46 with navigation system op
BMW AG - TIS
30.01.2013 05:09
Issue status (12/2007) Valid only until next DVD is issued
Copyright
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