Display messages
Possible causes/consequences and
M
Solutions
Collision Preven‐
tion Assist inoper‐
ative
COLLISION PREVENTION ASSIST PLUS is not available due to a mal-
function.
X
Visit a qualified specialist workshop.
Collision Preven‐
tion Assist cur‐
rently unavail. See
Owner's Man.
COLLISION PREVENTION ASSIST PLUS is temporarily inoperative.
Possible causes:
R
The sensors in the front bumper are dirty.
R
The function is impaired due to heavy rain or snow.
R
The radar sensor system is temporarily inoperative, e.g. due to
electromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation.
R
The system is outside the operating temperature range.
R
The on-board voltage is too low.
Once the causes listed above no longer apply, the display message
goes out and COLLISION PREVENTION ASSIST is operational again.
If the display message does not disappear:
X
Pull over and stop the vehicle, paying attention to road and traffic
conditions.
X
Secure the vehicle against rolling away (
Y
page 177).
X
Switch off the engine.
X
Clean the sensors in the front bumper (
Y
page 342).
X
Restart the engine.
SPEEDTRONIC Limit
LDC_Spd_Dsr
speedUnit
While depressing the accelerator pedal beyond the pressure point
(kickdown), SPEEDTRONIC cannot be activated.
X
If conditions permit, drive faster than 30 km/h and store the speed.
SPEEDTRONIC passive
You depress the accelerator pedal beyond the pressure point. Whilst
you are accelerating, SPEEDTRONIC does not control the speed.
X
Release the accelerator pedal. SPEEDTRONIC is reactivated and
limits the speed.
Lane Keeping Assist
inoperative
Lane Keeping Assist is faulty.
X
Visit a qualified specialist workshop.
274
Display messages (vehicles with steering wheel buttons)
On-board computer and displays
