Mercedes-Benz 2009 M-Class Operator's Manual page 169

default speed programmed at the factory is
4 mph (Canada: 6 km/h). The default speed
can be reprogrammed using the control
system ( Y page 159). The next time the
DSR is switched on, the DSR will use the
newly programmed default speed to
regulate the vehicle's speed.
Once the DSR is switched on, you can
adjust the set speed using the cruise
control lever ( Y page 164). Keep in mind
that adjusting the set speed using the
cruise control lever with the DSR switched
on will not change the programmed default
speed. If the DSR is switched off and then
switched on again, the DSR will use the
programmed default speed.
Depending on the road surface and level of
downhill grade, the DSR may not be able to
maintain the set speed. To maintain the set
speed, apply the brakes if necessary.
Switching the DSR on/off
DSR switch
1
Indicator lamp
2
G Warning!
If the accelerator pedal is depressed while
the Downhill Speed Regulation (DSR) is
activated, the vehicle can drive faster than
the programmed set speed. You should
therefore drive downhill with particular
caution as it could otherwise lead to an
accident and/or serious injury to you or
others. Keep in mind that as soon as you
remove your foot from the accelerator
pedal with the DSR switched on, the DSR
will start regulating the vehicle's speed
including use of brakes if required.
Depending on the programmed set speed,
Controls in detail
Driving systems
actual vehicle speed and gradient, the DSR
can cause the vehicle to slow down rapidly.
Sudden and unexpected deceleration can
result in loss of vehicle control, causing an
accident and/or serious personal injury to
you and others.
Switching on the DSR
The DSR can only be switched on if the vehicle
speed is below 18 mph (Canada: 30 km/h).
X
Press DSR switch 1.
Indicator lamp comes on.
2
The message DSR and the set speed appear
in the multifunction display.
i If the DSR is switched on at a speed above
18 mph (Canada: 30 km/h), the message
DSR Max. Speed 18 mph (Canada:
30 km/h) appears in the multifunction
display.
Z
167