Display
messages 204 Display messages Possible cause/consequence Possible solution
. Dipped-beam, left
or
Dipped-beam, right The right-hand or left-hand dipped-beam
headlamp is fa
ulty. X
Visit a qualified specialist workshop. . AUTO lights inop-
erative The light sensor is faulty. Constant head-
lamp mode is switched on. X
Switch the lights to manual control in the on-
board computer (Y page 107).
X Switch the lights on and off using the light
switch. . Trailer turn sig-
nal left
or
Trailer turn sig-
nal right The left-hand or right-hand trailer turn sig-
nal is faulty. X
Replace the bulb. . Trailer brake lamp The left-hand or right-hand trailer brake
lamp is faulty. X
Replace the bulb. . Trailer tail lamp
left
or
Trailer tail lamp
right The left-hand or right-hand trailer tail lamp
is faulty. X
Replace the bulb. . Trailer reversing
lamp The left-hand or right-hand trailer revers-
ing lamp is faulty. X
Replace the bulb. Practical advice
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Troubleshooting
223Problem Possible cause/consequence Suggested solutions
You hear a warning signal when
reversing. The ultrasonic reversing aid sen-
sors are dirty or there is interfer-
ence. X
Clean the ultrasonic reversing aid sensors (Y page 186).
X Switch the ignition back on. The problem ma
y be caused by an
external source of radio or ultra-
sound waves. The ultrasonic
reversing aid is switched off. X
See if ultrasonic reversing aid functions in a different location. You hear a warning tone when
reversing or you do not hear a
warning tone and none of the seg-
ments light up. The ultrasonic reversing aid has
malfunctioned and has switched
itself off. X
Have the ultrasonic reversing aid checked at a qualified specialist
workshop as soon as possible. Headlamps and turn signals
Problem Possible cause/consequence Suggested solutions
The headlamps or the turn signals
in the exterior mirrors are misted
up on the inside. Air humidity is very high. X
Drive with the headlamps switched on.
The headlamps are demisted after a short distance. The headlamp housing is not
sealed and moisture has been
able to enter. X
Have the headlamps checked at a qualified specialist workshop. Practical advice
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Vehicle electronics
260 Vehicle electronics
Tampering
with the engine electron-
ics G
Risk of accident
Only have work on the engine electronics
and related components carried out at a
qualified specialist workshop which has the
necessary specialist knowledge and tools
to carry out the work required. Mercedes-
Benz recommends that you use a
Mercedes-Benz Service Centre for this pur-
pose. In particular, work relevant to safety
or on safety-related systems must be car-
ried out at a qualified specialist workshop.
The vehicle's roadworthiness could other-
wise be affected.
! Only have work done on the engine elec-
tronics and its associated parts, such as
control units, sensors and connector leads,
carried out at a qualified specialist work-
shop, e.g. a Mercedes-Benz Service
Centre. Otherwise, vehicle components
may wear more quickly and your vehicle's
warranty and operating permit may be inva-
lidated. Retrofitting electrical and electronic
equipment
Electrical and electronic equipment can jeop-
ardise the operating safety of your vehicle. If
equipment of this kind is retrofitted, it must
be type-approved and bear the emark. The
e mark may be obtained from the equipment
manufacturer or an authorised testing centre.
! Damage or consequential damage arising
from fitting equipment not approved by
Mercedes-Benz is not covered by the
Mercedes-Benz warranty.
If you wish to install two-way radios in the
vehicle, you must obtain formal approval.
Mercedes-Benz approves the installation of
two-way radios if such equipment is installed
professionally and a low-reflection exterior
aerial is used.
The transmission output of the two-way radio
must not exceed the maximum transmission
outputs listed. G
Risk of accident
Two-way radios may interfere with the vehi-
cle electronics and thereby jeopardise the
operational safety of the vehicle and your
own safety if: R
they do not have an exterior aerial
R the exterior aerial is not a low-reflection
aerial
R the exterior aerial has been fitted incor-
rectly G
Risk of injury
Excessive electromagnetic radiation may
also cause damage to your health and the
health of others. Using an exterior aerial
takes into account current scientific dis-
cussions relating to the possible health haz-
ards that may result from electromagnetic
fields.
For this reason, only have the exterior aerial
fitted at a qualified specialist workshop
which has the necessary specialist knowl-
edge and tools to carry out the work
required. Mercedes-Benz recommends
that you use a Mercedes-Benz Service
Centre for this purpose. In particular, work
relevant to safety or on safety-related sys-
tems must be carried out at a qualified spe-
cialist workshop.
i Mercedes-Benz recommends the use of
an approved exterior aerial. This ensures
optimal reception quality for mobile tele- Technical data
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