Speed control system
Introduction
This chapter contains information on the following subjects:
Functioning
140
Operating Description 140
The Cruise Control System (CCS) maintains a set speed without you having to
actuate the accelerator pedal.
The state where the GRA maintains the speed is referred to hereinafter as the
control.
WARNING
■
The GRA only serves to support and does not relieve the driver of the re-
sponsibility for the vehicle operation.
■
Always adjust the speed and driving style to the current visibility, weath-
er, road and traffic conditions.
Functioning
Read and observe on page 140 first.
Basic requirements for start of control
The GRA is activated.
On vehicles with a manual transmission, the second gear or higher is en-
gaged.
On vehicles with an automatic transmission, the selector lever is in the D,
S position or in the Tiptronic position.
The current speed is higher than approx. 20 km/h.
This is only possible within the range which is permitted by the power output
and braking power of the engine.
WARNING
If the engine power and engine braking effect is insufficient to maintain
the set speed, vehicle operation must be taken over!
Operating Description
Fig. 142
Cruise control system controls
Read and observe on page 140 first.
Overview of the control elements of the CCS » Fig. 142
A
Deactivate CCS (delete set speed)
Interrupt control (sprung position)
Activate CCS (control deactivated)
B
Take control again
a)
/ Increase speed
C
Launch control / reduce speed
a)
If no speed is set the current speed is adopted.
After the start of the regulation, the GRA regulates the vehicle to the current
speed and the warning light
illuminates in the instrument cluster.
After the interruption in control, the stored speed can be resumed by pressing
the
B
button.
Automatic control interruption
Automatic control interruption occurs if any of the following conditions are
met.
›
By pressing the brake or clutch pedal.
›
When one of the brake assist systems (e.g. ESC) intervenes.
›
Through an airbag deployment.
WARNING
■
Always deactivate the cruise control system after use to prevent the sys-
tem being switched on unintentionally.
■
Control may only be resumed if the set speed is not too high for the cur-
rent traffic conditions.
140
Driving
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