Page 240 of 342

237 What you should know at the gas station
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index • Coolant
For normal replenishing, use water (potable water
quality).
For further information (e.g. anticorrosion/
antifreeze), see page 314.
• Spark plugs
Approved spark plugs, see page 312.
• Tire pressure
For tire pressure, refer to tire pressure label inside
the fuel filler flap. See page 272 for further details.
• Air conditioner
R-134a refrigerant and special PAG lubricant, see
page 316.•Bulbs
high beam: H7(55 W),
low beam: H7 (55 W)
low beam: BiXenon D2S - 35 W (optional)
fog lamps: H8 (35 W)
fog lamps: H3 (55 W) (optional)
turn signal, parking, side marker and standing
lamps, front: 1157 (32 / 3 cp),
stop lamps: P 21 W (1073 [32 cp]),
backup lamps: P 21 W (1073 [32 cp]),
turn signal lamps, rear: P Y 21 W,
tail, parking, standing, and rear fog lamp, driver’s
side: P 21/4 W,
side marker lamp, rear: W 5 W,
license plate lamps: C 5 W (tubular),
high mounted stop lamp: P 21 W (1073 [32 cp]).
Page 241 of 342
238 Check regulary and before a long trip
Te ch n i c a l
data Instruments
and controlsOperationDrivingInstrument
cluster displayPractical hints Car care Index
Check regularly and before a long trip 1Engine oil level
See “Checking engine oil level” on page 255 and
“Engine oil level indicator” on page 96.
2Coolant level
See “Coolant level” on page 256.
3Brake fluid
See “Brake fluid” on page 316.
4Windshield washer system/
Headlamp cleaning system/
Rear window washer system
For refilling reservoir see page 258.
Opening hood, see page 253.
Vehicle lighting: Check function and cleanliness. For
replacement of light bulbs, see “Exterior lamps” on
page 282.
Exterior lamp switch, see page 97.
Page 243 of 342

240 Malfunction and indicator lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hints Car care Index
Malfunction and indicator lamps
in the instrument cluster
General information:
If a bulb in the instrument cluster fails to light up
during the bulb self-check when turning the key in
steering lock to position 2, have it checked and replaced
if necessary.
On-board diagnostic system
Check engine malfunction indicator lamp
Engine malfunction indicator lamp. If the
“CHECK ENGINE” malfunction indicator
lamp comes on when the engine is running,
it indicates a malfunction of the fuel management
system, emission control system, systems which impact
emissions, or the fuel cap is not closed tight (check the
fuel cap). If the “CHECK ENGINE” lamp is illuminated
continuously and the vehicle is driving normally, you
may still drive the vehicle, however, in all cases, we
recommend that you have the system checked at your
authorized Mercedes-Benz Light Truck Center as soon
as possible.
If the “CHECK ENGINE” lamp comes on continuously
and / or the vehicle is not driving normally (e.g.
malfunction of the fuel management system or running out of fuel), serious damage can occur to the emission
system. Please contact your authorized Mercedes-Benz
Light Truck Center immediately.
The Sequential Multiport Fuel Injection (SFI) control
module monitors emission control components that
either provide input signals to or receive output signals
from the control module. Malfunctions resulting from
interruptions or failure of any of these components are
indicated by the “CHECK ENGINE” malfunction
indicator lamp in the instrument cluster and are
simultaneously stored in the SFI control module.
If the “CHECK ENGINE” malfunction indicator lamp
comes on, have the system checked at your authorized
Mercedes-Benz Light Truck Center as soon as possible.
With some exceptions, the control module switches off
the “CHECK ENGINE” malfunction indicator lamp if the
condition, causing the lamp to come on, no longer exists
during three consecutive cycles. See also page 242 for
fuel cap placement warning.
An on-board diagnostic connector is located in the
passenger compartment near to the parking brake
pedal, allowing the accurate identification of system
malfunctions through the readout of diagnostic trouble
codes.
CHECK
ENGINE
Page 285 of 342

282 Exterior lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Exterior lamps
Headlamp adjustment
Correct headlamp adjustment is extremely important.
Check and readjust headlamps at regular intervals and
when a bulb has been replaced.
For adjusting headlamp aim see page 290.Replacing bulbs
To prevent a possible electrical short circuit, switch off
lamp prior to replacing a bulb.
When replacing bulbs, install only 12 volt bulbs with
the specified watt rating.
When replacing halogen bulbs do not touch glass
portion of bulb with bare hands. Use plain paper or a
clean cloth.
Wa r n i n g !
Bulbs and bulb holders can be very hot. Allow the
lamp to cool down before changing a bulb.
Halogen lamps contain pressurized gas. A bulb can
explode if you:
• touch or move it when hot,
•drop the bulb,
• scratch the bulb.Wear eye and hand protection.
Wa r n i n g !
Because of high voltage in BiXenon lamps, it is
dangerous to replace the bulb of repair the lamp
and its components. We recommend that you have
such work done by a qualified technician.
Page 286 of 342
283 Exterior lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Headlamp assembly (Halogen)
1Headlamp vertical / horizontal adjustment screw
2Headlamp vertical / horizontal adjustment screw
3Headlamp cover with locking tab
4High beam headlamp cover with locking tab
5Bulb socket for turn signal, parking, standing, and
side marker lamp6Electrical connector for low beam headlamp bulb
7Electrical connector for high beam headlamp bulb
P82.10-2756-26
6
P82.15-2082-26
Page 287 of 342
284 Exterior lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Headlamp assembly (BiXenon)
1Headlamp vertical / horizontal adjustment screw
2Headlamp vertical / horizontal adjustment screw
3Headlamp cover with locking tab
4High beam headlamp cover with locking tab
5Bulb socket for turn signal, parking, standing, and
side marker lamp6Electrical connector for BiXenon headlamp bulb
7Electrical connector for high beam headlamp bulb
P82.10-2756-26
P82.10-2805-26
6
Page 288 of 342

285 Exterior lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index Bulbs for high beam H7 55 W
Open hood.
Remove cover (4). Pull off electrical connector (7).
Unhook and move aside clamping ring. Remove bulb.
Insert new bulb (seating properly in cutouts of bulb
socket), mount clamping ring. Reinstall and push
electrical connector on securely. Reinstall cover (4).
Bulbs for low beam (only Halogen headlamps)
H7 55 W
Open hood.
Push down tab at top end of cover (3) and remove. Pull
off electrical connector (6). Unhook and move aside
clamping ring. Remove bulb.
Insert new bulb (seating properly in cutouts of bulb
socket), mount clamping ring. Reinstall and push
electrical connector on securely. Reinstall cover (3).BiXenon D2S 35 W
(optional; Canada only standard on ML 500)
Parking, standing, side marker and turn signal lamp
115 7 N A ( 3 2 / 3 c p b u l b )
Open hood.
Twist bulb socket (5) counterclockwise and pull out.
Push bulb into socket, turn counterclockwise and
remove.
Insert new bulb in socket, push in and twist clockwise.
Reinstall bulb socket.
Wa r n i n g !
Because of high voltage in BiXenon lamps, it is
dangerous to replace the bulb or repair the lamp
and its components. We recommend that you have
such work done by a qualified technician.
Page 289 of 342
286 Exterior lamps
Te ch n i c a l
data Instruments
and controlsOperation DrivingInstrument
cluster displayPractical hintsCar care Index
Fog lamp assembly
The foglamps are located in the front bumper.
Check and readjust foglamps at regular intervals and
when a bulb has been replaced.
Removing fog lamp assembly:
Remove foglamp holder from bumper by pressing
locking tab of fog lamp holder using a suitable tool
(e.g. screw driver). Swing fog lamp holder out of bumper
and remove fog lamp from holder.1Bulbs for fog lamps
H8 35 W
2Ta b s
Remove connector from lamp (1), turn lamp socket
towards left and pull out. Remove bulb.
Insert new bulb into lamp socket and insert into
housing. Turn socket towards right.
During fog lamp installation, make sure that fog lamp
tabs (2) firmly seat into the slots of the holder.
P82.10-2764-26