2012 MERCEDES-BENZ G-Class sensor

truck or a pneumatic drill could cause the
ultrasonic backing up aid to malfunction.
Minimum distance Center Approximately 8 in
(approximately 20 cm)
Corners Approximately 8 in
(approximately 20 cm)
If there is an obstacle within this range, all
warning displays flash and a warning tone
sounds. If the distance falls below the
minimum, the distance may no longer be
shown.
Warning displays
The warning display shows the distance
between the sensors and the obstacle.
The warning display is in the rear
compartment next to the rear door.
The warning display is divided into four yellow
and two red segments :. The ultrasonic
backing
up
aid is ready for use when you hear
a warning tone and segment ; lights up
briefly.
One or more segments : light up as the
vehicle approaches an obstacle, depending
on the distance from the obstacle. From the:
R
fourth segment you will hear an
intermittent warning tone
R fifth segment you will hear a faster
intermittent warning tone
R sixth segment you will hear a very fast
intermittent warning tone. This indicates
that you have now reached the minimum
distance. Driving systems
143
Driving and parking Z

Problems with the ultrasonic backing-up aid
Problem Possible causes/consequences and
M SolutionsYou hear a warning
signal when backing
up. The ultrasonic backing up aid sensors are dirty or there is
interference.
X
Clean the ultrasonic backing up aid sensors ( Y page 220).
X Switch the ignition back on. The problem may be caused by an external source of radio or
ultrasound waves. The ultrasonic backing up aid is switched off.
X
See if the ultrasonic backing up aid functions in a different
location. You hear a warning
tone when backing up
or you do not hear a
warning tone and none
of the segments light
up. The ultrasonic backing up aid has malfunctioned and has switched
itself off.
X
Have the ultrasonic backing up aid checked at a qualified
specialist workshop as soon as possible. Rear view camera
Important safety notes The rear view camera is an optical parking aid.
It shows the area behind your vehicle in the
COMAND display.
G
WARNING
Make sure that no persons or animals are in
the maneuvering range. Otherwise, they
could be injured.
The rear view camera is in the tailgate above
the rear window wiper. :
Rear view camera
View through the camera The area behind the vehicle is displayed in a
mirror-inverted manner, as in the rear-view
mirror.
G
WARNING
The rear view camera is only an aid and may
show a distorted view of obstacles, show
them incorrectly or not at all. The rear view
camera is not a substitute for paying
attention. The
camera cannot show objects in
the following areas: 144
Driving systems
Driving and parking

Lights
Display messages Possible causes/consequences and
M Solutions
b
Low-Beam Left
 or 
Low-Beam Right The left or right-hand low-beam headlamp is defective.
X
Visit a qualified specialist workshop. b
AUTO-Light
Inoperative The light sensor is defective. The low-beam headlamps are
switched on.
X
USA only: set the lights to manual operation in the on-board
computer ( Y page 160).
X Switch the lights on and off using the light switch.
X Visit a qualified specialist workshop. b
Turn signal rear
left Back-up bulb
on
  or  

Turn signal
rear right Back-up
bulb on The rear left-hand or rear right-hand turn signal is defective.
Another lamp has taken over its function.
X
Replace the bulb
(
Y page 94). b
Turn signal left
mirror
  or  Turn
signal right

mirror The turn signal in the left-hand or right-hand exterior mirror is
defective.
These
messages will only appear if all of the turn signal's
LEDs have failed.
X Visit a qualified specialist workshop. b
Turn signal front
left Back-up bulb
on

  or
 

Turn signal
front right Back-
up bulb on The front left-hand or front right-hand turn signal is defective.
Another lamp has taken over its function.
X
Replace the bulb
(
Y page 94). b
Brake lamp left
  or
 Brake lamp right The left or right-hand brake lamp is defective.
X
Replace the bulb (
Y page 94). b
High-mounted
brake
lamp The high-mounted brake lamp is faulty. This message will only
appear if all of the brake lamp's LEDs have failed.
X
Visit a qualified specialist workshop.168
Display messages
On-board computer and displays

Tires
G
WARNING
Do not drive with a flat tire. A flat tire affects the ability to steer or brake the vehicle. You may
lose control of the vehicle. Continued driving with a flat tire will cause excessive heat build-up
and possibly a fire. G
WARNING
Follow recommended tire inflation pressures.
Do not
underinflate tires. Underinflated tires wear excessively and/or unevenly, adversely affect
handling and fuel economy, and are more likely to fail from being overheated.
Do not overinflate tires. Overinflated tires can adversely affect handling and ride comfort, wear
unevenly, increase stopping distance, and result in sudden deflation (blowout) because they are
more likely to become punctured or damaged by road debris, potholes etc. Display messages Possible causes/consequences and
M
Solutions
Tire pressure
displayed only
after driving for
a few minutes The tire pressure monitor is measuring the tire pressure.
X
Drive on.
The tire

pressures appear in the multifunction display after you
have been driving for a few minutes. Tire Pres.
Check Tires
G
Risk of accident
The
tire pressure monitor has detected a significant pressure loss.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay

attention to the traffic conditions as you do so.
X Check the tires.
X Check the tire pressure and correct it if necessary
(Y page 242).
X Repair or change the faulty wheel as necessary ( Y page 226).
X Then restart the tire pressure monitor when the tire pressure is
correct (

Y page 249). Tire Pres. Monitor
Inoperative The tire pressure monitor is deactivated due to a malfunction.
X
Visit a qualified specialist workshop. Tire Pres. Monitor
Inoperative No
Wheel Sensors The wheels mounted do not have a suitable tire pressure sensor.
The tire pressure monitor is deactivated.
X
Mount wheels with suitable tire pressure sensors.
The tire

pressure monitor is activated automatically after driving
for a few minutes. Display messages
175
On-board computer and displays Z

Display messages Possible causes/consequences and
M SolutionsCaution Tire Defect
G
Risk of accident
The tire pressure in one or more tires has dropped suddenly. The
wheel position is shown in the multifunction display.
X Stop the vehicle without making any sudden steering or braking
maneuvers. Pay
attention to the traffic conditions as you do so.
X If necessary, change a wheel ( Y page 226).Correct The
Tire Pres. The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
X
Check the tire pressures at the next opportunity. If necessary,
correct the tire pressure ( Y page 245).
X Restart the tire pressure monitor (Y page 251). Wheel Sensor
Missing There is no signal from the tire pressure sensor of one or several
wheels. The pressure of the affected tire is not displayed in the
multifunction display.
X
Have the faulty tire pressure sensor replaced at a qualified
specialist workshop. Tire Pres. Monitor
Currently
Unavailable Due to a source of radio interference, no signals can be received
from the wheel sensors. The tire pressure monitor is temporarily
malfunctioning.
X
Drive on.
The tire

pressure monitor restarts automatically as soon as the
problem has been solved. h
Correct The Tire
Pres. The tire pressure is too low in at least one of the tires, or the tire
pressure difference between the wheels is too great.
X
Check the tire pressures at the next opportunity. If necessary,
correct the tire pressure ( Y page 248).176
Display messages
On-board computer and displays

!
Do not
add distilled or de-ionized water to
the washer fluid container. Otherwise, the
level sensor may be damaged.
i Add windshield washer concentrate, e.g.
MB SummerFit, to the washer fluid all year
round. Example: washer fluid reservoir
X
Mix the windshield washer fluid in a
container beforehand.
X At temperatures above freezing: fill the
washer fluid reservoir with a mix of water
and windshield washer concentrate (e.g.
MB SummerFit).
X At temperatures below freezing: fill the
washer fluid container with a mix of water
and MB SummerFit windshield washer
concentrate. For

information on the mixing
ratio, see (Y page 277) or use the premixed
windshield washer solution with antifreeze
available in specialist stores.
X To open: pull cap : upwards by the tab.
X Add the premixed washer fluid.
X To close:
press cap :
onto the filler neck
until it engages.
Brake fluid level !
If you notice that the brake fluid level in
the brake fluid reservoir has fallen to the
MIN mark or less, check the brake system
immediately for leaks. Also check the
thickness of the brake linings. Visit a
qualified specialist workshop immediately.
Do not add brake fluid. This does not
correct the error. Only check the brake fluid level when the
vehicle is stationary and on a level surface.
The brake fluid level is correct if it is between
MIN
marking ;

and MAX marking : on the
brake fluid reservoir. Maintenance
Service interval display
Service messages Information on the type of service and service
intervals (see separate Maintenance
Booklet).
You can obtain further information from an
authorized Mercedes-Benz Center or at
http://www.mbusa.com (USA only).
The service interval message informs you of
the next service due date.
If
a

service due date has been exceeded, you
also hear a warning tone.
The multifunction display shows a service
message for several seconds, e.g.:
Service A In 99999 Miles
Service A Due Now
Service A Exceeded By 99999 Miles
The symbol and the letter indicate which type
of service is due:
¯ Minor service A
± Major service B
The service interval display does not take into
account any

periods of time during which the
battery is disconnected. Maintenance
215
Maintenance and care Z

Cleaning the headlamps
X
Clean the headlamp lenses with a damp
sponge and a mild cleaning agent, e.g.
Mercedes-Benz car shampoo or cleaning
cloths.
! Only use cleaning agents or cleaning
cloths which are suitable for plastic
headlamp lenses. Unsuitable cleaning
agents or cleaning cloths could scratch or
damage the plastic headlamp lenses.
Cleaning the sensors X
Clean sensors : of the driving systems
with water, car shampoo and a soft cloth.
! When cleaning the sensors with a power
washer, maintain a distance between the
vehicle and
the nozzle of the power washer
of at least 11.8 in (30 cm). Information
about the correct distance is available from
the equipment manufacturer.
Cleaning the rear view camera X
Use clear water and a soft cloth to clean
camera lens :.
! Do not

clean the camera lens and the area
around the rear view camera with a power
washer.
Cleaning chrome parts Impurities combined with the effects of road
grit
and

corrosive environmental factors may
cause flash rust to form on the surface. You
can restore the original shine of the chrome
parts by cleaning them regularly, especially in
winter and after washing.
! Do not clean chrome parts e.g. the
exhaust tail pipes (G 55 AMG) or stainless-
steel spare hub cap with alkaline-based
cleaning agents such as wheel cleaner.
X Clean the chrome parts with a chrome care
product tested

and approved by Mercedes-
Benz. Interior care
Cleaning the display X
Before cleaning the display, make sure that
it is switched off and has cooled down.
X Clean the display surface using a
commercially available microfiber cloth
and TFT/LCD display cleaner.
X Dry the display surface using a dry
microfiber cloth.
! For cleaning, do not use any of the
following:
R alcohol-based thinner or gasoline
R abrasive cleaning agents
R commercially-available household
cleaning agents
These may

damage the display surface. Do
not put pressure on the display surface
when cleaning. This could lead to
irreparable damage to the display. 220
Care
Maintenance and care

Check the tire pressures at least once a
month.
Only check and correct tire pressures when
the tires are cold (
Y page 245).
Checking tire pressures manually To determine and set the correct tire
pressure, proceed as follows:
X
Remove the valve cap of the tire that is to
be checked.
X Press the tire pressure gauge securely onto
the valve.
X Read the tire pressure and compare it with
the recommended value on the Tire and
Loading Information placard on the
B-pillar on
the driver's side of your vehicle.
X If necessary, increase the tire pressure to
the recommended value ( Y page 245).
X If the tire pressure is too high, release air
by pressing

down the metal pin in the valve
using the tip of a pen, for example. Then,
check the tire pressure again using the tire
pressure gauge.
X Screw the valve cap onto the valve.
X Repeat these steps for the other tires. Tire pressure monitor
Important safety notes If a tire pressure monitor system is installed,
the vehicle's wheels have sensors that
monitor
the

tire pressures in all four tires. The
tire pressure monitor warns you when the
pressure drops in one or more of the tires. The
tire pressure monitor only functions if the
correct wheel electronics units are installed
on all wheels. The tire pressure monitor has a yellow
warning lamp in the instrument cluster for
indicating pressure loss/malfunctions (USA)
or pressure loss (Canada). Whether the
warning lamp flashes or lights up indicates
whether a tire pressure is too low or the tire
pressure monitoring system is
malfunctioning:
R
if the warning lamp is lit continuously, the
tire pressure on one or more tires is
significantly too low. The tire pressure
monitor is not malfunctioning.
R USA only: if the warning lamp flashes for
60 seconds

and then remains lit constantly,
the tire pressure monitor is malfunctioning. G
WARNING
The TPMS does not indicate a warning for
wrongly selected inflation pressures. Always
adjust tire

inflation pressure according to the
Tire and Loading Information placard or the
supplemental tire inflation pressure
information on the inside of the fuel filler flap.
The TPMS is not able to issue a warning due
to a sudden dramatic loss of pressure (e.g. tire
blowout caused by a foreign object). In this
case bring the vehicle to a halt by carefully
applying the brakes and avoiding abrupt
steering maneuvers. G
WARNING
Each tire, including the spare (if provided),
should be checked at least once a month
when cold and inflated to the pressure
recommended by the vehicle manufacturer
on the Tire and Loading Information placard
on the driver's door B-pillar or the tire
pressure label on the inside of the fuel filler
flap. If

your vehicle has tires of a different size
than the size indicated on the Tire and Loading
Information placard or the tire pressure label,
you should determine the proper tire pressure
for those tires.
As an added safety feature, your vehicle has
been equipped with a tire pressure monitoring
system (TPMS) that illuminates a low tire
pressure telltale when one or more of your Tire pressure
249
Wheels and tires
Z