Mercedes-Benz S 450 4MATIC Operator's Manual page 467

Controls in detail
Driving systems
Warning!
DISTRONIC Plus should not be used in
snowy or icy road conditions.
The most likely cause for a malfunctioning
system is a dirty sensor (located behind
the hood grille), especially at times of snow
and ice or heavy rain. In such a case,
DISTRONIC Plus will switch off, and the
message:
"DISTRONIC PLUS
Currently Unavailable
See Oper. Manual"
appears in the multifunction display.
For cleaning and care of the
DISTRONIC Plus sensor, see "Cleaning the
®
DISTRONIC Plus*/ PRE-SAFE Brake*
system sensors (USA only)" ( page 619).
466
i
If the message:
G
"DISTRONIC PLUS
Currently Unavailable
See Oper. Manual"
disappears during driving and the last speed
stored flashes for approximately 5 seconds, the
dirt (e.g. slush) has dissolved; DISTRONIC Plus is
again available.
Another cause might be that the radar sen-
sors have been manually switched off in
the instrument cluster control system.
Please verify that the radar sensors are
switched on ( page 307).
Turns and bends
In turns or bends, DISTRONIC Plus may not
detect a moving vehicle in front, or it may
detect one too soon. This may cause your
vehicle to brake late or unexpectedly.