Mercedes-Benz 2005 M-Class Operator's Manual page 160

Controls in detail
Driving systems
Warning indicators
The warning indicators show the distance
between the sensor and the obstacle. The
warning indicators for the front area are lo-
cated above the center air vents in the
dashboard. The warning indicator for the
rear area is located in the rear passenger
compartment lamp.
Front area warning indicator
1 Segments, left side of vehicle
2 Segments, right side of vehicle
Each warning indicator has six yellow and
two red segments.
158
The gear selector lever position deter-
mines which warning indicator is activat-
ed.
Selector lever Warning indicator
position
D, R, N, P Front area activated
R Rear area activated
As soon as the sensors detect an obstacle,
one or more segments light up, depending
on the distance. An intermittent acoustic
warning will also sound as the seventh seg-
ment comes on and a constant acoustic
warning lasting a maximum of
three seconds will sound for the eighth
segment.
!
If all red segments light up in the warn-
ing indicators, a dirty sensor or a ultra-
sonic signal could be the reason.
Clean the sensors ( page 243).
After cleaning the sensors, switch
the ignition on.