Operation Manual

Vehicle care 151
battery. Ensure the ignition is
switched off before connecting or
disconnecting the vehicle battery.
Retrofitted electrical or electronic
accessories can place an additional
load on the battery or discharge the
battery. Seek the assistance of
a workshop regarding technical
possibilities, such as fitting a more
powerful battery.
Ensure the ignition is switched off
before reconnecting the battery. Then
perform the following actions:
1. Set date and time in the
information display 3 74.
2. If necessary, activate the power
windows and sun roof 3 29, 3 31.
In order to prevent the battery from
discharging, some consumers such
as the courtesy lights automatically
switch off after a delay.
Charge a disconnected battery every
6 weeks.
Battery discharge protection 3 110.
Diesel fuel filter
Drain diesel fuel filter of residual
water at every engine oil change.
Place a container underneath the
filter housing. Turn drain plug
anticlockwise using a suitable
screwdriver, to drain off the water.
The filter is drained as soon as diesel
fuel emerges from the port. Retighten
the drain plug by turning it clockwise.
With engine switched off, turn ignition
key to ON, wait approx. 5 seconds,
and turn key to LOCK to perform
priming operation. Perform this
operation 3 times or more while the
engine is switched off, to avoid air
entering the fuel line.
Check diesel fuel filter at shorter
intervals if the vehicle is subjected to
extreme operating conditions.
If there is water in the diesel fuel filter,
control indicator N illuminates in the
instrument cluster 3 86. Drain the
water immediately.
Diesel fuel system
bleeding
If the fuel tank has been run dry, the
diesel fuel system must be bled.
Switch on the ignition three times for
15 seconds at a time. Then start the
engine for a maximum of
40 seconds. If the engine will not start,
wait at least 10 seconds before trying
again. If the engine fails to start, seek
the assistance of a workshop.