Page 714 of 801
713 Practical hints
Replacing SmartKey batteries
3Batteries
4Contact springs
Pull out batteries3.
Using a line-free cloth, insert new bat-
teries 3 under contact springs 4 with
the positive terminal (+) side facing up.
Return battery compartment 2 into
housing until it locks into place.
Slide the mechanical key back into the
SmartKey/SmartKey with
KEYLESS-GO*.
Check the operation of the SmartKey/
SmartKey with KEYLESS-GO*.
Page 718 of 801
717 Practical hints
Replacing bulbs
Replacing bulbs for front lamps
Before you start to replace a bulb for a
front lamp, do the following first:
Turn the exterior lamp switch to M
(page 399).
Open the hood (
page 573).
1Cover 1
2Cover 2
3Cover 3Removing and installing washer fluid
reservoir on left-hand side
Vehicles with Airmatic*
You must remove the washer fluid reser-
voir in order to change the bulbs of the
front headlamp on the left-hand side. The
washer fluid reservoir is on the front
left-hand side of the engine compartment.
Washer fluid reservoir (example illustration
from S 550)1Retaining screwRemoving
Turn retaining screw1 counterclock-
wise.
Take washer fluid reservoir out of
mounting.
Place washer fluid reservoir to the side
and do not disconnect any wires or ca-
bles.
Installing
Guide washer fluid reservoir into
mounting so that the bottom retaining
lug slides into the rubber sleeve on the
longitudinal member.
Turn retaining screw1 clockwise.
Page 719 of 801
718 Practical hintsReplacing bulbsBi-Xenon headlamps High beam flasher lamp
In vehicles with Bi-Xenon headlamps, you
can only change the halogen bulb for the
high-beam flasher lamp.
1Bulb holder
2Wire position
3Grip
Turn cover2 (
page 717) counter-
clockwise and remove it.
Turn bulb holder1 counterclockwise
until it disengages.
Take out bulb holder1.
Take bulb out of holder.
Insert new bulb into holder and press it
all the way down.
The tab of the bulb holder must be po-
sitioned on the upper left-hand side
and wire2 must point upward and to
the right for the left headlamp, down-
ward and to the left for the right head-
lamp.
Turn bulb holder clockwise until it en-
gages and grip3 is in a horizontal po-
sition.
Warning!
G
Do not remove the cover for the Bi-Xenon
headlamp. Because of high voltage in Xenon
lamps, it is dangerous to replace the bulb or
repair the lamp and its components. We rec-
ommend that you have such work done by a
qualified technician.
Page 720 of 801
719 Practical hints
Replacing bulbs
IR emitter*
1Bulb holder
2Wire position
Turn cover2 (
page 717) counter-
clockwise and remove it.
Turn bulb holder1 counterclockwise
until it disengages.
Take out bulb holder1.
Press both catches on left and right
sides of bulb holder1 and take bulb
out of holder.
Insert new bulb into holder until it en-
gages.
Insert bulb holder1 into guide in
headlamp. Wire2 must point down-
ward and to the right.
Turn bulb holder1 clockwise until it
engages and wire2 points downward
and to the left.
Corner-illuminating lamp
1Bulb holder
2Grip
3Wire position
Turn cover3 (
page 717) counter-
clockwise and remove it.
Turn bulb holder1 counterclockwise
until it disengages.
Take out bulb holder1.
Take bulb out of holder.
Insert new bulb into holder and press it
all the way down.
Insert bulb holder1 into guide in
headlamp.
The tab of the bulb holder must be po-
sitioned on the upper left-hand side
and wire3 must point downward and
to the left for the left headlamp, up-
ward and to the right for the right head-
lamp.
Turn bulb holder1 clockwise until it
engages and grip2 is in a horizontal
position.
Page 723 of 801
722 Practical hintsReplacing wiper bladesVehicles with KEYLESS-GO*
Make sure the vehicle’s on-board elec-
tronics have status 1 (
page 372).
Turn combination switch to wiper
settingu (
page 408).
Press KEYLESS-GO start/stop button
repeatedly until windshield wipers
start.
Press KEYLESS-GO start/stop button
when the wiper arms are in a vertical
position.
Removing wiper blades
Fold the wiper arm forward until it
snaps into place.
Turn the wiper blade at a right angle to
wiper arm (arrow 1).
Slide the wiper blade sideways out of
the retainer in the direction of
arrow2.
Installing wiper blades
Slide the wiper blade onto wiper arm
until it locks in place.
Rotate the wiper blade into position
parallel to wiper arm.
Fold the wiper arm backward to rest on
the windshield. Make sure you hold
onto the wiper when folding the wiper
arm back.
!
Do not pull on the wiper blade inserts. They
could tear.
!
Make certain that the wiper blades are prop-
erly installed. Improperly installed wiper blades
may cause windshield damage.
Page 725 of 801
724 Practical hintsFlat tirePreparing the vehicle
Prepare the vehicle as described
(page 723).
Take vehicle tool kit tray and vehicle
jack out of trunk (
page 705).
Take the spare wheel from the wheel
well under the trunk floor
(page 707).
Lifting the vehicle
Prevent the vehicle from rolling away
by blocking wheels with wheel chocks
or other sizeable objects.
One wheel chock is included with the
vehicle tool kit (
page 707).
When changing wheel on a level surface:
Place the wheel chock in front of and
another sizeable object behind the
wheel that is diagonally opposite to the
wheel being changed.Always try lifting the vehicle using the jack
on a level surface. However, should cir-
cumstances require you to do so on a hill,
place the wheel chock and another size-
able object as follows:
Place the wheel chock and another
sizeable object on the downhill side
blocking both wheels on the side of the
vehicle not being worked on.
Wheel wrench
On wheel to be changed, loosen but
do not yet remove the wheel bolts
(approximately one full turn with
wrench 1).
Warning!
G
The jack is designed exclusively for jacking
up the vehicle at the jack take-up brackets
built into both sides of the vehicle. To help
avoid personal injury, use the jack only to lift
the vehicle during a wheel change. Never
get beneath the vehicle while it is supported
by the jack. Keep hands and feet away from
the area under the lifted vehicle. Always en-
gage the electronic parking brake and block
wheels before raising vehicle with jack.
Do not disengage electronic parking brake
while the vehicle is raised. Be certain that
the jack is always vertical (plumb line) when
in use, especially on hills. Always try to use
the jack on level surface.
Make sure the jack arm is fully seated in the
jack take-up bracket. Always lower the vehi-
cle onto sufficient capacity jackstands be-
fore working under the vehicle.
Page 726 of 801
725 Practical hints
Flat tire
The jack take-up brackets are located di-
rectly behind the front wheel housings and
in front of the rear wheel housings.
2Jack take-up bracket
3Jack
4Crank
Place jack2 on firm ground.
Position jack3 under take-up
bracket2 so that it is always vertical
(plumb-line) as seen from the side,
even if the vehicle is parked on an
incline.
Turn crank4 clockwise until jack3
is fully seated in take-up bracket2
and the jack base evenly meets the
ground.
Jack up the vehicle until the wheel is a
maximum of 1.2 in (3 cm) from the
ground. Never start engine while
vehicle is raised.
Warning!
G
Position the jack only on the jack take-up
brackets designed for this purpose.
If the jack is not properly positioned, the ve-
hicle may fall off the jack and cause serious
personal injury or damage to the vehicle.Warning!
G
The jack is intended only for lifting the
vehicle briefly for wheel changes. It is not
suited for performing maintenance work
under the vehicle.
Never start the engine when the vehicle
is raised.
Never lie down under the raised vehicle.
Page 728 of 801
727 Practical hints
Flat tire
Clean contact surfaces of wheel and
wheel hub.
Guide the spare wheel onto the align-
ment bolt and push it on.
Insert wheel bolts and tighten them
slightly.
Unscrew the alignment bolt, install the
last wheel bolt and tighten slightly.Lowering the vehicle
Lower vehicle by turning crank coun-
terclockwise until vehicle is resting ful-
ly on its own weight.
Remove the jack.
1 - 5 Wheel bolts
!
Wheel bolts2 must be used when mount-
ing a Minispare wheel with steel rim. The use of
any wheel bolts other than wheel bolts2 for a
Minispare wheel with steel rim will physically
damage the vehicle’s brakes.
Wheel bolts1 must be used when mounting a
Minispare wheel with light alloy rim. The use of
any wheel bolts other than wheel bolts1 for
a Minispare wheel with light alloy rim will physi-
cally damage the vehicle’s brakes.
Warning!
G
Make sure to use the original length wheel
bolts when remounting the original wheel
after it has been repaired.
!
To avoid paint damage, place wheel flat
against hub and hold it there while installing first
wheel bolt.
