Blind Spot Assist - Mercedes-Benz 212 Sedan E-Class Service Manual

Blind Spot Assist

The Blind Spot Assist with code (234) is an accident-
prevention system which assists the drive in safely
performing a lane change. The Blind Spot Assist moni-
tors events to the rear and sides of the vehicle where
the inside rearview mirror and the two outside mirrors
cannot provide adequate visibility (blind spots). These
areas are monitored by radar sensors installed on the
left and right sides of the rear bumper. The Blind Spot
Assist is activated in the instrument cluster by means
of the buttons on the multifunction steering wheel.
If the driver initiates a lane change by operating the
turn signals while there is another vehicle inside the
detection range, a visual and acoustic collision
warning is issued.
Monitoring and warning indicator
When the Blind Spot Assist is switched on, the indi-
cator lamps in the outside mirrors light up yellow if the
engine is on and the vehicle is traveling at a speed of
less than 30 km / h. Above a speed of 30 km / h the
indicator lamps go out and the Blind Spot Assist is
ready to operate. If a vehicle is detected inside the
monitoring zone at a speed of 30 km / h or above, the
warning lamp on the appropriate side lights up red.
The warning always occurs whenever a vehicle enters
the detection range from behind or from the side.
When a vehicle is overtaking, a warning is given only if
the speed difference is less than 12 km / h.
Detection range
The Blind Spot Assist monitors the immediate area
behind and beside the vehicle up to a range of three
meters.
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Introduction of the New E-Class, Model Series 212 Sedan
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– This printout will not be recorded by the update service. Status: 01 / 2009 –
Collision warning
If a vehicle is detected inside the blind spot monitoring
zone and the turn signal on the same side is actuated,
a double warning tone sounds once and the warning
lamp flashes red. The red warning lamp in the outside
mirror continues to flash until the turn signal is deac-
tivated or the other vehicle leaves the monitoring
zone. Another acoustic warning is not given.
i Note
If there is a trailer hitched to the vehicle, the rear
area of the car cannot be monitored by the Blind
Spot Assist. The warning message "Blind Spot
Assist currently unavailable, see owner's manual"
is displayed in the instrument cluster and the func-
tion indicators of the Blind Spot Assist are
switched off.
The radar sensors control unit detects a hitched
trailer from a signal from the trailer recognition
control unit.
Visual warning message
M21 / 1e2 Left Blind Spot Assist warning lamp
P54.71-2025-00