Mercedes-Benz 2009 GL320 BlueTEC Operator's Manual page 198

Controls in detail
Driving systems
Current Warning indicator
transmission
position
D Front area activated
R or N Front and rear area
activated
As your vehicle approaches an object, one or
more distance segments will illuminate,
depending on the distance. When the seventh
distance segment illuminates, you have
reached the minimum distance.
Front area: An intermittent acoustic
R
warning will sound as the first red distance
segment illuminates and a constant
acoustic warning lasting a maximum of
2 seconds will sound for the second red
distance segment. The signal is canceled
when the automatic transmission is shifted
into park position P or the parking brake is
engaged.
Rear area: An intermittent acoustic
R
warning will sound as the first red distance
segment illuminates and a constant
acoustic warning lasting a maximum of
2 seconds will sound for the second red
distance segment. The signal is canceled
196
when the automatic transmission is shifted
into drive position D, or park position P, or
the parking brake is engaged.
Switching the Parktronic system on/off
The Parktronic system switches on
automatically when the ignition is switched
on.
Vehicle without enhanced off-road package
Parktronic switch
1
Indicator lamp
2
Vehicle with enhanced off-road package
Parktronic switch
1
Indicator lamp
2
X
Switching off Parktronic system: Press
Parktronic switch 1.
Indicator lamp comes on.
2
X
Switching on Parktronic system: Press
Parktronic switch again.
1
i
Vehicles with original equipment
Mercedes-Benz Trailer Hitch Kit:
The rear Parktronic sensor will disengage
automatically when towing a trailer.