Antenna Diagnosis
The antenna diagnosis procedure on the E93 is the same as that
on the BMW3 Series (E90, E91, E92). Self-diagnosis of the diver-
sity module is initiated in the diagnosis module of the BMW diag-
nosis system. This procedure must be carried out with the hardtop
up and down in order to check all antennas.
The self-diagnosis includes a check of the antenna inputs based
on DC measurement. If this check returns a positive result, each
individual FM antenna is switched on one after the other and the
field strength assessed (antenna scan).
AM reception can be checked with the AM amplifier switched on
and off in the LW, MW and SW ranges. The diagnosis system eval-
uates the measurements and deduces a diagnostic result if the
self-diagnosis of the diversity module is positive.
This procedure can also be performed manually through service
mode of the CCC and M-ASK. The signal quality and field strength
of the station currently tuned in can be indicated in service mode.
Service mode is accessed as follows:
• Select start menu
• Press and hold controller for at least 10 s
• Turn controller 3 notches to the right
• Turn controller 3 notches to the left
• Turn controller 1 notch to the right
• Turn controller 1 notch to the left
• Turn controller 1 notch to the right
• Press controller once
Press the menu button to exit service mode.
Low values relating to the signal quality and field strength may indi-
cate damaged antennas or no terminal Rad_ON. Terminal Rad_ON
supplies the antenna amplifier and diversity module with voltage.
32
E93 Complete Vehicle Workbook
Index Explanation Index Explanation
1
Normal reception
6
Self-diagnosis
2
Self-diagnosis/interface
7
Result of self-diagnosis
3
Antenna scan diagnosis
8
Antenna amplifier ( to t10)
4
Self-diagnosis-OK
9
Antenna amplifier (from t10)
5
Self-diagnosis error
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