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Electrical system
Notes on changing bulbs
Bulbs and lights are essential for vehicle safety. You must therefore ensure that all bulbs are functioning at all times.
Bulbs have a limited service life.
Mercedes-Benz recommends, that when a dipped-beam headlamp or main-beam headlamp bulb fails that the corresponding bulb in the other headlamp is replaced at the same time. Mercedes-Benz recommends that you use Mercedes-Benz longlife bulbs for this purpose.
 | Risk of injury |
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Observe the following notes concerning the handling of bulbs:
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Bulbs can become very hot. There is a risk of burns. You must therefore allow them to cool completely before changing them.
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To avoid injuries, always wear non-slip gloves and safety goggles when replacing bulbs.
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Do not use a bulb if it has been dropped or if its glass has been scratched. The bulb could explode. You could be injured by the shards of glass from a broken bulb.
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Keep bulbs out of reach of children.
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Only operate the bulbs in enclosed light fittings constructed for the purpose and only use bulbs of the same type. Observe the information on the bulbs.
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Dirt on the glass bulb reduces the operating life of the bulb. Do not hold the glass bulb with your bare hands. If necessary, clean the glass bulb with alcohol or spirit while it is cold and wipe with a lint-free cloth.
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Protect the bulbs from moisture when in operation.
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Xenon lamps operate at high voltage, high pressure and high temperature. There is a risk of fatal injury if live parts of the lamp and ballast are touched. If the headlamp is damaged, do not touch the xenon lamp. Do not change xenon bulbs yourself.
Only have defective xenon bulbs changed at a qualified specialist workshop which has the necessary specialist knowledge and tools for the work required. Mercedes-Benz recommends that you use a Mercedes-Benz Service Centre for this purpose.
All work relevant to safety or on safety-related systems must be carried out at a qualified specialist workshop.
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Replacing bulbs
Observe the
following:
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Switch off the
lighting before replacing bulbs to prevent a short circuit.
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Only touch new
bulbs with a clean, lint-free cloth - never with wet or oily
fingers.
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Check contacts for
corrosion and clean them if necessary.
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Check that all
seals are sitting correctly. Replace damaged seals.
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If the new bulb
still does not light up, visit a qualified specialist workshop, e.g. a
Mercedes-Benz Service Centre.
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Headlamps with
front turn signal lamps
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 | Fastening screw |
 | Faceplate |
 | Turn signal lamp |
 | Headlamps |
|
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 | Adjustment screws |
 | Headlamp fastening
screws |
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Do
not turn adjustment screws , otherwise the headlamps will have to be
readjusted.
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Turn signal
lamp above the headlamps
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Unscrew upper fastening screw
of the
headlamp.
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Remove turn signal lamp
.
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Disconnect the
cable connector from the turn signal lamp.
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Press down the
holder and turn it anti-clockwise.
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Press the bulb
down, turn it anti-clockwise and replace
it.
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Headlamps
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| Dipped-beam
headlamp |
| Side lamp |
| Main-beam
headlamp |
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Main-beam
headlamp
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Remove the rubber
cover.
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Disconnect the
cable connector from main-beam headlamp
.
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Detach the retainer
springs and take out the bulb.
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Fit the new bulb
for the main-beam headlamp in such a way that the guide lugs on the bulb holder
plate engage in the recesses on the neck of the
headlamp.
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Side
lamp
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Remove the rubber
cover.
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Remove the cable
connector of side lamp with the holder.
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Replace the
bulb.
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Dipped-beam
headlamp
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Remove the rubber
cover.
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Release the
retaining clamp on the cable connector of dipped-beam headlamp
and disconnect
the cable connector.
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Unscrew retaining
screws on the retaining plate with the bulb.
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Remove the
retaining plate with the bulb.
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Replace the
bulb.
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Front foglamps
Front foglamps
in the bumper
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| Front foglamps |
| Plastic cap |
| Retaining
lug |
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Front foglamps
under the bumper
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| Fastening screws |
| Adjustment
screws |
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Unscrew fastening
screws on the
front foglamp.
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Do not turn
adjustment screws , otherwise the front foglamps will have to be
readjusted.
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Remove the
reflector unit.
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Disconnect the
cable connector from the front foglamp.
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Detach the retainer
springs and change the
bulb.
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Side-mounted
turn signal lamps
Turn signal
lamp, round
Turn signal
lamp, square
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| Lens with housing |
| Bulb
holder |
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Depending on the
vehicle's equipment, a perimeter lamp may be integrated into the turn
signal.
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Rear lamp
cluster
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| Fastening screws |
| Perimeter lamp/side marker
lamp |
| Turn signal lamp |
| Brake lamp |
| Tail lamp |
| Reversing lamp |
 | Rear foglamp |
 | Licence plate
lamp |
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6-chamber rear lamp cluster
 |
| Fastening screws |
| Turn signal lamp |
| Brake lamp |
| Tail lamp |
| Rear foglamp |
| Reversing lamp |
| Licence plate
lamp |
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4-chamber rear lamp cluster
Perimeter lamp/side marker
lamp
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| Fastening screw |
| Lens with housing |
| Bulb |
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Perimeter lamp,
top
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| Fastening screw |
| Lens with housing |
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| Bulb |
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Entry lamp
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| Lens with cover
frame |
| Bulb
holder |
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Interior light
in the low-roof cab
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| Lens |
| Reading lamp bulb |
| Interior light
bulb |
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Push in the catch
springs with a screwdriver and remove lens
.
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Replace the faulty
bulb.
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Interior light
in the high-roof cab
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| Interior lamp |
| Nightlight |
| Reading
lamp |
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Reading lamp,
berth
Partially masking headlamps - driving on the left/right
When using the vehicle for international transportation:
In countries where vehicles are driven on the left, a specific area of the headlamp lens must be masked with opaque, self-adhesive tape. This will ensure that you do not dazzle oncoming traffic.
When using the vehicle for international transport or in other countries, observe the relevant national regulations.
Responsibility for the vehicle lighting always rests with the driver.
| Risk of accident |
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There is a risk of dazzling oncoming traffic with the asymmetrical dipped-beam headlamps in countries where vehicles are driven on the opposite side of the road to the country in which the vehicle was registered. In these countries, you should mask the headlamps as specified by Mercedes-Benz to ensure that you do not dazzle oncoming traffic.
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The following illustrations show which area of the headlamp lens must be covered on your vehicle.
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Make masking strips from commercially available opaque adhesive tape, cutting to the size and shape shown in the illustrations.
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Apply to the corresponding area of the headlamp.
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Making the headlamp mask yourself
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| Headlamp, left |
| Headlamp, right |
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Headlamp masking surface for left-hand-drive vehicles when in countries where vehicles drive on the left
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| Headlamp, left |
| Headlamp, right |
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Headlamp masking surface for right-hand-drive vehicles when in countries where vehicles drive on the right
Fuses
The fuse box
containing the main and auxiliary fuse carriers is located in the footwell on
the co-driver's side.
| Risk of fire |
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Do not fit fuses with a higher amperage than specified. This would result in damage to the electrical system or even a fire in the electrical system.
Only use fuses of the specified amperage and do not bridge or repair fuses. Do not replace a fuse until the cause of the malfunction has been traced and rectified.
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| Fasteners |
| Upper cover |
| Lower cover |
| Main fuse carrier |
| Auxiliary fuse
carrier |
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Checking and
replacing
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| Spare fuses |
| Fuse
extractor |
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Main fuse carrier
The individual
electrical circuits are protected by safety fuses or automatic
circuit-breakers.
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If an electrical
circuit failure occurs, switch off electrical consumers and visually check the
fuse.
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Replace the
defective fuse with a spare fuse.
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Switch on
electrical consumers and check that they function
correctly.
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Automatic
circuit-breaker
If an automatic
circuit-breaker is triggered
 :
To check the
automatic circuit-breaker:
Layout of the
fuses on the main fuse carrier
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| Spare fuses |
| Fuses F1 - F41 |
| Relays |
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Main fuse carrier base module
(GM)
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GM
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Consumer
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F1
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Rear foglamps
including trailer
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10A
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F2
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Instrument
cluster/switch lighting, headlamp cleaning system, distribution
(terminal 58)
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10A
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F3
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Telligent® roll
control
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10A
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F4
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Pop-up roof, 24V
radio, frequent-stop brake (terminal 30)
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10A
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F5
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Working-area lamp,
LSVA (Swiss heavy goods vehicle fee), (terminal 30)
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10A
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F6
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Unassigned
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F7
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Distribution
(terminal D+)
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15A
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F8
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Exterior mirror
heating
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10A
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F9
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24V power
sockets
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15A
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F10
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Diagnostic socket,
instrument, tachograph (terminal 30)
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10A
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F11
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Trailer socket
(terminal 30)
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20A
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F12
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Trailer power
socket for ABS (terminal 30)
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20A
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F13
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Interior lighting,
Toll Collect (terminal 30)
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10A
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F14
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Headlamp cleaning
system
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10A
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F15
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Alternator,
transmission, LSVA (Swiss heavy goods vehicle fee), (terminal
15)
|
10A
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F16
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Power
take-offs
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10A
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F17
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Blower,
air-conditioning
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20A
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F18
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Radio, telephone,
auxiliary heating system, fax, instrument (terminal
15R)
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10A
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F19
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Cigarette
lighter
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10A
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F20
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Co-driver's power
window
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15A
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F21
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Driver's door
control panel
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15A
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F22
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Cleaning system,
turn signals (terminal 30)
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10A
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F23
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Right dipped-beam
headlamp
|
10A
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F24
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Left dipped-beam
headlamp
|
10A
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F25
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Right main-beam
headlamp
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10A
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F26
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Left main-beam
headlamp, main-beam indicator lamp
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10A
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F27
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Tail lamp, parking
lamp, left-hand side marker lamp, trailer socket, Toll Collect (terminal
58)
|
10A
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F28
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Tail lamp, parking
lamp, right side marker lamps, trailer socket
|
10A
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F29
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Transmission
control
|
10A
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F30
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Engine control
(terminal 15), GGVSE: EMERGENCY OFF
|
10A
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F31
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Exterior mirror
adjustment, SCR frame module (terminal 15)
|
10A
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F32
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ESP, auxiliary
heating water-heater unit, all-wheel drive, (terminal
15)
|
10A
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F33
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Cleaning system,
turn signals, trailer socket, (terminal 15)
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10A
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F34
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Brake lamp, trailer
socket, reversing lamp
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10A
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F35
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Trailer socket,
ABS, condensation sensor
|
10A
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F36
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Unassigned
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F37
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Windscreen washer
system
|
10A
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F38
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Tachograph,
instrument, airbag (terminal 15)
|
10A
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F39
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Horn, air horn,
Toll Collect, diagnostic socket, FleetBoard®, distribution (terminal
15)
|
10A
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F40
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Differential
locks
|
10A
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F41
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Seat
heating
|
10A
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Layout of the
fuses on the auxiliary fuse carrier
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| Fuses F1-F14 (A1) |
| Fuses F1-F14 (A2) |
| Relays
(A31/A32) |
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Modules A1, A2, A31/A32 on
the auxiliary fuse carrier
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|
A vehicle-specific
sticker with the fuse assignments is located on the inside of the cover of the
fuse box.
|
|
A1
|
Consumer
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|
F1
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Toll Collect,
auxiliary heating system clock, FleetBoard® (terminal
30)
|
10A
|
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F2
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Auxiliary
heating
|
20A
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F3
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Central
locking/enhanced central locking system
|
15A
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F4
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Enhanced central
locking system
|
15A
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F5
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Electropneumatic
brake, torch socket (terminal 15)
|
10A
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F6
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12V
socket
|
15A
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F7
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Voltage
transformer: 24V/12V, 8A
|
10A
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Voltage
transformer: 24V/12V, 15A
|
15A
|
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F8
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Central
locking/enhanced central locking system, remote control, retarder
|
10A
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F9
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Compressed-air
drier
|
10A
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F10
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Non-MB body
electrical system
|
15A
|
|
F11
|
SCR frame module
(terminal 30)
|
15A
|
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F12
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Loading
tailgate
|
10A
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F13
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Electropneumatic
gearshift
|
15A
|
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Transmission
control
|
10A
|
|
F14
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Working-area
lamp
|
10A
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|
A2
|
Consumer
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|
F1
|
Windscreen heating
|
20A
|
|
F2
|
Daytime driving
lights
|
10A
|
|
F3
|
Windscreen heating,
Telligent® Lane Assistant
|
10A
|
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F4
|
Refrigerator
|
10A
|
|
F5
|
Electrohydraulic
auxiliary steering (terminal 30)
|
10A
|
|
Oil cooler transfer
case
|
15A
|
|
F6
|
Electrohydraulic
auxiliary steering (terminal 15), oil cooler transfer case
(terminal 30)
|
10A
|
|
F7
|
Electropneumatic
gearshift
|
15A
|
|
F8
|
Rotating beacon
lamp
|
10A
|
|
F9
|
Electropneumatic
brake (terminal 30)
|
15A
|
|
F10
|
Mobile phone
(terminal 30)
|
10A
|
|
F11
|
Steer angle
sensor
|
10A
|
|
F12
|
Telligent®
distance control, mobile phone (terminal 15)
|
10A
|
|
F13
|
Windscreen
heating
|
20A
|
|
F14
|
Electropneumatic
brake (terminal 30)
|
15A
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