Mercedes-Benz 2003 M-Class Operator's Manual page 226

Practical hints
What to do if ...
Problem
¿ The yellow malfunction indicator
lamp comes on while driving.
{ The yellow malfunction indicator
lamp comes on while driving.
The yellow LOW RANGE indicator
ê
lamp blinks after one or more
switching conditions.
The yellow LOW RANGE indicator
ê
lamp blinks after switching the
ignition on.
226
Possible cause
The BAS or ESP is malfunctioning.
It is possible that the engine output will be re-
duced.
4-ETS has switched off to prevent overheat-
ing of the brakes. Also see 4-ETS/ESP warn-
ing lamp ( page 224).
4-ETS is malfunctioning and has switched off.
The gear selection conditions have not been
adhered to.
LOW RANGE mode is malfunctioning.
Suggested solution
Have the BAS/ESP checked at an au-
thorized Mercedes-Benz Light Truck
Center as soon as possible.
As soon as the brakes have cooled off,
4-ETS switches on again.
The indicator lamp goes out.
Have the 4-ETS checked at your au-
thorized Mercedes-Benz Light Truck
Center as soon as possible.
Repeat the gear selection process
( page 118).
Have the LOW RANGE mode checked at
your authorized Mercedes-Benz Light
Truck Center.