Display messages
Possible causes/consequences and
M
Solutions
Collision Preven‐
tion Assist Plus
Inoperative
COLLISION PREVENTION ASSIST PLUS is temporarily inoperative due
to a malfunction. Adaptive Brake Assist may also have failed.
X
Visit a qualified specialist workshop immediately.
PRE-SAFE Inopera‐
tive See Operator's
Manual
Important functions of PRE-SAFE
®
have failed. All other occupant
safety systems, e.g. air bags, remain available.
X
Visit a qualified specialist workshop immediately.
PRE-SAFE Functions
Currently Limited
See Operator's Man‐
ual
PRE
‑
SAFE
®
PLUS or PRE
‑
SAFE
®
Brake is temporarily inoperative.
Possible causes are:
R
function is impaired due to heavy rain or snow.
R
the radar sensor system is temporarily inoperative, e.g. due to elec-
tromagnetic radiation emitted by nearby TV or radio stations or
other sources of electromagnetic radiation.
R
Mercedes-AMG vehicles: ESP
®
is deactivated
R
the system is outside the operating temperature range.
R
the on-board voltage is too low.
When the causes stated above no longer apply, the display message
disappears.
PRE
‑
SAFE
®
PLUS and PRE
‑
SAFE
®
Brake are operational again.
If the display message does not disappear:
X
Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions.
X
Secure the vehicle against rolling away (
Y
page 152).
X
Restart the engine.
X
Mercedes-AMG vehicles: switch ESP
®
on again (
Y
page 68).
PRE-SAFE Functions
Limited See Opera‐
tor's Manual
PRE
‑
SAFE
®
PLUS or PRE
‑
SAFE
®
Brake is unavailable due to a mal-
function. BAS PLUS with Cross-Traffic Assist may also have failed.
X
Visit a qualified specialist workshop immediately.
226
Display messages
O
n-boar
dc
om
puter
an
dd
ispl
ays
Summary of Contents for MY17 c-class
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