light MERCEDES-BENZ GL-Class 2012 X164 Repair Manual

Rear overhead control panel (second row of seats)
:Switches the reading lamp on/off
Rear overhead control panel (third row of seats)
:p Switches the left-hand reading lamp
on/off;p Switches the right-hand reading
lamp on/off
Interior lighting control
Important notes
In order to prevent the vehicle's battery from
discharging, the interior lighting functions are
automatically deactivated after some time
except for when the SmartKey is in position
2 in the ignition lock.
Automatic interior lighting control
XTo switch on/off: press the | button.
When the automatic interior lighting
control is activated, the button is flush with
the overhead control panel.The interior lighting automatically switches
on if you:
R unlock the vehicle
R open a door
R remove the SmartKey from the ignition lock
The interior light is activated for a short while
when the SmartKey is removed from the
ignition lock. You can activate this delayed
switch-off using the on-board computer
( Y page 226).
Manual interior lighting controlXTo switch the front interior lighting on/
off: press the c button.XTo switch the rear interior lighting on/
off: press the v button.XTo switch the reading lamps on/off:
press the p button.
Crash-responsive emergency lighting
The interior lighting is activated automatically
if the vehicle is involved in an accident.
XTo switch off the crash-responsive
emergency lighting: press the hazard
warning lamp button.
or
XLock and then unlock the vehicle using the
key.
Replacing bulbs
Important safety notes
Xenon bulbs
If your vehicle is equipped with Xenon bulbs,
you can recognize this by the following: the
cone of light from the Xenon bulbs moves
from the top to the bottom and back again
when you start the engine. For this to be
observed, the lights must be switched on
before starting the engine.
Replacing bulbs123Lights and windshield wipersZ

GDANGER
Xenon bulbs carry a high voltage. You could
get an electric shock and be seriously or even
fatally injured if you touch the electric
contacts on Xenon bulbs. Therefore, never
remove the cover from Xenon bulbs.
Do not change Xenon bulbs yourself, but have
them replaced 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 an
authorized Mercedes-Benz Center for this
purpose. In particular, work relevant to safety
or on safety-related systems must be carried
out at a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.
Other bulbs
There are bulbs other than the Xenon bulbs
that you cannot replace. Replace only the
bulbs listed (Y page 124). Have the bulbs that
you cannot replace yourself changed at a
qualified specialist workshop.
Mercedes-Benz recommends that you use an
authorized Mercedes-Benz Center for this
purpose. In particular, work relevant to safety
or on safety-related systems must be carried
out at a qualified specialist workshop.
If you require assistance changing bulbs,
consult a qualified specialist workshop.
Do not touch the glass tube of new bulbs with
your bare hands. Even minor contamination
can burn into the glass surface and reduce
the service life of the bulbs. Always use a lint-
free cloth or only touch the base of the bulb
when installing.
Only use bulbs of the correct type.
If the new bulb still does not light up, consult
a qualified specialist workshop.
Bulbs and lamps are an important aspect of
vehicle safety. You must therefore make sure
that these function correctly at all times.
Have the headlamp setting checked regularly.GWARNING
Bulbs and lamps can be very hot. You should
therefore allow them to cool down before you
change them. Otherwise, you could be burned
if you touch them.
Keep bulbs out of the reach of children.
Otherwise, they could damage the bulbs, for
example, and injure themselves.
Never use a bulb which has been dropped.
Such a bulb may break or even explode and
injure you.
Halogen bulbs are pressurized and can
explode when you change them, particularly
if they are very hot. You should therefore wear
eye protection and gloves when you are
changing them.
Overview: changing bulbs/bulb types
You can change the following bulbs. The bulb
type can be found in the legend.
Halogen headlamps
:Low-beam headlamp: H7 55 W;High-beam headlamp: H7 55 W=Parking lamp/standing lamp: W 5 W?Turn signal lamp: 3457AASide marker lamp: WY 5 W124Replacing bulbsLights and windshield wipers

Bi-Xenon headlamps
:High-beam headlamp: H7 55 W;Parking lamp/standing lamp: W 5 W=Turn signal lamp: 3457A?Side marker lamp: WY 5 W
Tail lamps with LEDs
:Rear fog lamp: H 21 W (driver's side only);Backup lamp: P 21 W
License plate lamp
:License plate lamp: C 5 WChanging the front bulbs
Low-beam headlamps (halogen
headlamps)XSwitch off the lights.XOpen the hood.XTurn housing cover : counter-clockwise
and pull it out.XTurn bulb holder ; counter-clockwise and
pull it out.XTake the bulb out of bulb holder ;.XInsert the new bulb into bulb holder ;.XInsert bulb holder ; into the lamp and turn
it clockwise.XAlign housing cover : and turn it
clockwise until it engages.
High-beam headlamps
XSwitch off the lights.XOpen the hood.XTurn housing cover : counter-clockwise
and pull it out.Replacing bulbs125Lights and windshield wipersZ

XTurn bulb holder ; counter-clockwise and
pull it out.XTake the bulb out of bulb holder ;.XInsert the new bulb into bulb holder ;.XInsert bulb holder ; into the lamp and turn
it clockwise.XAlign housing cover : and turn it
clockwise until it engages.
Parking lamp/standing lamp
XSwitch off the lights.XOpen the hood.XTurn bulb holder : counter-clockwise and
pull it out.XTake the bulb out of bulb holder :.XInsert the new bulb into bulb holder :.XInsert bulb holder : into the lamp and turn
it clockwise.
Turn signal lamps/side marker lamps
XSwitch off the lights.XOpen the hood.XTurn bulb holder : (WY 5 W)/ ; (3457A)
counter-clockwise and pull it out.XRemove the bulb from bulb holder :/; .XInsert the new bulb into bulb
holder :/; .XInsert bulb holder :/; and turn it
clockwise.
Changing the rear bulbs
Opening and closing the side trim
panels
You must open the side trim panel in the
cargo compartment before you can change
the bulbs in the tail lamps.
Left-hand side trim panel
126Replacing bulbsLights and windshield wipers

XTo open: turn release knob : 90° in the
direction of the arrow and remove side trim
panel ;.XInsert a suitable object, e.g. a coin, into the
slots of release knobs =.XTurn release knobs = 90° in the direction
of the arrow and remove stowage
compartment ?.XTo close: insert stowage
compartment ? and turn release
knobs = in the opposite direction to the
arrow until the slots on the release knobs
are in a vertical position.XInsert side trim panel ; and turn release
knob : 90° in the opposite direction to
the arrow.
Right-hand side trim panel
XTo open: insert a suitable object, e.g. a
coin, into the slot of release knob : on
side trim panel ;.XTurn release knob : 90° in the direction
of the arrow and remove side trim
panel ;.XTo close: insert side trim panel ; and turn
release knob : 90° in the opposite
direction to the arrow.Tail lamps with LEDs:Rear fog lamp;Backup lampXSwitch off the lights.XOpen the cargo compartment.XOpen the side trim panel ( Y page 126).XTurn the corresponding bulb holder
counter-clockwise and remove it.XRemove the bulb from the bulb holder.XInsert the new bulb into the bulb holder.XInsert the bulb holder and turn it clockwise.XClose the side trim panel ( Y page 126).
License plate lamps
XSwitch off the lights.XOpen the tailgate.XRemove screws :.XRemove the license plate lamp.XReplace the bulb.XInsert the license plate lamp.XReplace and tighten screws :.Replacing bulbs127Lights and windshield wipersZ

Adjusting the headlamps:V vertical axis;H (horizontal) height, measured from the
center
Setting the headlamps correctly is extremely
important. Setting the high-beam headlamps
also sets the low-beam headlamps. (The term
headlamps covers both high and low beam.)
To check and adapt the headlamp setting,
proceed as follows:
XPark the vehicle on level ground at a
distance of 25 feet (7.6 m) from a wall or
similar.XMake sure that the vehicle load is in the
normal range.XSwitch on the low-beam headlamps L.
If the light of the headlamps is not distributed
as shown in the illustration above, follow the
instructions below:
XOpen the hood ( Y page 300).
The adjustment screws are located under the
cover.
XInsert a suitable tool into the openings in
the cover. The directions of arrow =
and ? indicate the angle at which the tool
needs to be inserted in order to reach the
adjustment screws.XTurn both screws uniformly until the
vertical setting of the headlamp
corresponds to :. Turn the screws
clockwise to adjust the headlamp upwards
and counter-clockwise to adjust it
downwards.
Gradation:
R Screw at arrow =: 0.67˚ angle of
inclination
R Screw at arrow ?: 0.50˚ angle of
inclination
The left and right headlamps need to be
adjusted individually.
i If it is not possible to adjust the
headlamps accurately, have the
adjustment performed at an authorized
Mercedes-Benz Center.
Windshield wipers
Switching the windshield wipers on/
off
GWARNING
Wiper blades are components that are subject
to wear and tear. Replace the wiper blades
twice a year, preferably in the spring and fall.
Otherwise the windows will not be wiped
properly. As a result, you may not be able to
observe surrounding traffic conditions and
could cause an accident.
! Do not operate the windshield wipers
when the windshield is dry, as this could
damage the wiper blades. Moreover, dust
that has collected on the windshield can
scratch the glass if wiping takes place when
the windshield is dry.
! If the windshield wipers leave smears on
the windshield after the vehicle has been
128Windshield wipersLights and windshield wipers

washed in an automatic car wash, wax or
other residues may be the reason for this.
Clean the windshield using washer fluid
after washing the vehicle in an automatic
car wash.
Combination switch
1$ Windshield wipers off2Ä Intermittent wipe, low 113Å
Intermittent wipe, high 124°
Continuous wipe, slow5¯ Continuous wipe, fastBí Single wipe/ î To wipe the
windshield using washer fluidXSwitch on the ignition.XTurn the combination switch to the
corresponding position.
! Intermittent wiping with rain sensor: due
to optical influences and the windshield
becoming dirty in dry weather conditions,
the windshield wipers may be activated
inadvertently. This could then damage the
windshield wiper blades or scratch the
windshield.
For this reason, you should always switch
off the windshield wipers in dry weather.
In the Ä or Å position, the appropriate
wiping frequency is set automatically
according to the intensity of the rain. In
the Å position, the rain sensor is more
sensitive than in the Ä position, causing
the windshield wipers to wipe more
frequently.
Switching the rear window wiper on/
off
Combination switch
:è Switch2ô To wipe with washer fluid3I To switch on intermittent wiping40 To switch off intermittent wiping5ô To wipe with washer fluidXTurn the SmartKey to position 1 or 2 in the
ignition lock.XTurn switch : on the combination switch
to the corresponding position.
When the rear window wiper is switched on,
the icon appears in the instrument cluster.
Replacing the wiper blades
Important safety notes
GWARNING
For safety reasons, switch off the windshield
wipers and remove the key from the ignition
lock before changing the wiper blades
(vehicles with KEYLESS-GO: make sure that
the on-board electronics are in state 0).
Otherwise, the wiper motor could be switched
on suddenly and cause injury.
11 Rain sensor set to low sensitivity.
12 Rain sensor set to high sensitivity.Windshield wipers129Lights and windshield wipersZ

! To avoid damaging the wiper blades,
make sure that you touch only the wiper
arm of the wiper.
! Never open the hood if a windshield wiper
arm has been folded away from the
windshield.
Never fold a windshield wiper arm without
a wiper blade back onto the windshield/
rear window.
Hold the windshield wiper arm firmly when
you change the wiper blade. If you release
the windshield wiper arm without a wiper
blade and it falls onto the windshield, the
windshield may be damaged by the force of
the impact.
Mercedes-Benz recommends that you have
the wiper blades replaced by a qualified
specialist workshop, e.g. at an authorized
Mercedes-Benz Center.
Replacing the windshield wiper blades
Removing the wiper blades
XRemove the SmartKey from the ignition
lock.XFold the wiper arm away from the
windshield.XPress both release clips ;.XFold wiper blade : in the direction of
arrow = away from wiper arm ?.XRemove wiper blade : in the direction of
arrow A.Installing the wiper bladesXPosition the new wiper blade : with
recess B on lug A.XFold wiper blade : in the direction of
arrow = onto the wiper arm, until retaining
clips ; engage in bracket ?.XMake sure that wiper blade : is seated
correctly.XFold the wiper arm back onto the
windshield.
Replacing the rear window wiper blade
Removing the wiper blade
XRemove the SmartKey from the ignition
lock.XFold wiper arm : away from the rear
window until it engages.XPosition wiper blade ; at a right angle to
wiper arm :.130Windshield wipersLights and windshield wipers

XHold wiper arm : and press wiper
blade ; in the direction of the arrow until
it releases.XRemove wiper blade ;.
Installing the wiper blade
XPlace new wiper blade ; onto wiper
arm :.XHold wiper arm : and press wiper
blade ; in the opposite direction to the
arrow until it engages.XMake sure that wiper blade ; is seated
correctly.XPosition wiper blade ; parallel to wiper
arm :.XFold wiper arm : back onto the rear
window.
Problems with the windshield wipers
The windshield wipers are obstructed
Leaves or snow, for example, may be
obstructing the windshield wiper movement.
The wiper motor has been deactivated.
XFor safety reasons, you should remove the
SmartKey from the ignition lock.
or
XSwitch off the engine using the Start/Stop
button and open the driver's door.XRemove the cause of the obstruction.XSwitch the windshield wipers back on.
The windshield wipers are inoperative
The windshield wiper drive is malfunctioning.
XSelect another wiper speed on the
combination switch.XHave the windshield wipers checked at a
qualified specialist workshop.The spray nozzles are misaligned
The windshield washer fluid from the spray
nozzles no longer hits the center of the
windshield. The spray nozzles are misaligned.
XHave the spray nozzles adjusted at a
qualified specialist workshop.Windshield wipers131Lights and windshield wipersZ

Control panel for dual-zone automatic climate control:To set the temperature, left (Y page 141);To set climate control to automatic ( Y page 140)=To defrost the windshield ( Y page 142)?To increase the airflow ( Y page 142)ATo direct the airflow through the defroster vents ( Y page 142)BTo activate/deactivate cooling with air dehumidification ( Y page 139)CTo set the temperature, right ( Y page 141)DTo switch rear-compartment climate control on/off ( Y page 138)ETo direct the airflow through the center and side air vents ( Y page 142)FTo direct the airflow to the footwells and side air vents ( Y page 142)GTo display the airflow levelHTo reduce the airflow ( Y page 142)ITo switch the rear window defroster on/off ( Y page 143)JTo activate/deactivate air-recirculation mode ( Y page 144)KInterior temperature sensorLTo switch climate control on/off ( Y page 138)Notes on using dual-zone automatic
climate control
The following contains notes and
recommendations on optimum use of dual-
zone automatic climate control.
R Activate climate control using the à and
Á buttons. The indicator lamps in the
à and Á buttons light up.
R Set the temperature to 72 ‡ (22 †).
R Only use the "defrosting" function briefly
until the windshield is clear again.
R Only use "air-recirculation" mode briefly,
e.g. if there are unpleasant outside odorsor when in a tunnel. The windows could
otherwise fog up as, in air-recirculation
mode, no fresh air is drawn into the vehicle.
R Use the residual heat function if you want
to heat or ventilate the vehicle interior
when the ignition is switched off. The
"residual heat" function can only be
activated or deactivated with the ignition
switched off.Overview of climate control systems135Climate controlZ