It is still possible to fully steer the vehicle if the power steering fails or if the en-
gine is not running (vehicle being towed in). The only difference is that greater
physical effort is required.
It is possible that the hydraulic pump of the power steering will not run due to the
low vehicle network voltage if the battery has gone flat and the engine must star-
ted with the help off jump leads. This condition will be indicated by lighting up of
the warning light.
The power steering operates again if the battery is charged to a specific range
when engine is running. It also operates again, if the engine can be started with
its own battery.
If there is a fault in the power steering, the warning light lights up in the instru-
ment cluster ⇒ page 20. WARNING
Contact your specialist garage if the power steering is defective. CAUTION
Never leave the steering wheel at full lock for more than 15 seconds when the en-
gine is running - risk of damaging the power steering!
Tyre pressure monitoring system Fig. 114 Button for setting the tyre in-
flation pressure control valueThe tyre pressure monitoring system compares with the aid of the ABS sensors
the speed and also the rolling circumference of the individual wheels. If the rolling
circumference of a wheel is changed, the warning light
in the instrument clus-
ter ⇒ page 24 and an acoustic signal sounds. The rolling circumference of the tyre
can change if:
● the tyre inflation pressure is too low,
● the structure of the tyre is damaged,
● the vehicle is loaded on one side,
● the wheels of an axle are loaded heavily (e.g. when towing a trailer or when
driving uphill or downhill),
● snow chains are mounted,
● the temporary spare wheel is mounted,
● one wheel per axle was changed.
Basic setting of the system
After changing the tyre inflation pressures, after changing one or several wheels,
the position of a wheel on the vehicle (e.g. exchanging the wheels between the
axles) or when the warning light lights up while driving, a basic setting of the sys-
tem must be carried out as follows.
● Inflate all tyres to the specified inflation pressure ⇒
page 161.
● Switch on the ignition.
● Press button
⇒ fig. 114
for more than 2 seconds. While pressing the but-
ton, the warning light lights up. At the same time the memory of the system is
erased and the new calibration is started, which is confirmed with an audible sig-
nal and then the warning light goes out.
● If the warning light does not go out after the basic setting, there is a fault in
the system. Have the vehicle inspected by your nearest specialist garage.
Warning light lights up
If the tyre inflation pressure of at least one wheel is insufficiently inflated in com-
parison to the stored basic value, the warning light ⇒ lights up.
Warning light flashes
If the warning light flashes, there is a system fault. Have the vehicle inspected by
your nearest specialist garage. £130
Intelligent Technology
