
Fuses
General safety notes
G
WARNING
If you manipulate or bridge a faulty fuse or if
you replace it with a fuse with a higher amper- age, the electric cables could be overloaded.
This could result in a fire. There is a risk of an
accident and injury.
Always replace faulty fuses with the specified
new fuses having the correct amperage.
Faulty fuses must be replaced with fuses of
the same rating and which have the amperage
specified in the following overview. Fuses of
the same rating can be recognized by the
color and amperage. You can obtain advice
from a qualified specialist workshop.
If a new fuse blows again, have the cause
determined and rectified at a qualified spe-
cialist workshop.
The fuses and relays for the standard equip-
ment are located in the main fuse box in the
footwell on the left-hand side of the vehicle.
Additional fuses and relays for the items of
optional equipment are located in the fuse
box under the driver's seat and in its seat
base. Always have the fuses in the seat base
replaced at a qualified specialist workshop.
X Switch off the ignition and the electrical
consumers before changing a fuse. Vehicle code
Code MI6 - Proconve L6 low-emission vehicle Code MH3 - EPA 13/CARB low-emission
engine
Code XM0 - Model facelift (2013) Main fuse box
Fuse box in the footwell on the left-hand side of the
vehicle.
X To open: unlock quick-release fastener 0047
and remove the cover.
X To close: attach the bottom edge of the
cover and fold upwards.
The cover must engage.
X Lock quick-release fastener 0048. Fuses and relays
3 Z

Configuration
Fuses
The F87 fuse (30 A) for the DC/DC converter
is under the SRB fuse and relay module in the main fuse box. Have this fuse changed at a
qualified specialist workshop only.
SRB fuse and relay module No. Consumer Fuse
rating 1 Horn 15 A
2 ESTL (electric steering
lock) ignition lock 25 A
3 Terminal 30 Z, vehicles
with a gasoline engine/
ignition lock/instrument
cluster 10 A
4 Light switch/switch unit
on center console 5 A
5 Windshield wipers 30 A
6 Fuel pump 15 A No. Consumer Fuse
rating Terminal 87 (5)
1 10 A
7 MRM (jacket tube mod-
ule) 5 A
8 Terminal 87 (2) 20 A
9 Terminal 87 (1) 25 A
Terminal 87 (3), vehicles
with a gasoline engine 20 A
Terminal 87 (3), vehicles
with a diesel engine 25 A
10 Terminal 87 (4) 10 A
11 Terminal 15 R vehicle 15 A
12 Air bag control unit 10 A
1
Vehicles with code MI6/MH3/XM0. 4
Fuses and relays

No. Consumer Fuse
rating 13 Cigarette lighter/glove
box lamp/radio/body
manufacturer loading
tailgate/PND (personal
navigation device) power
socket 15 A
14 Diagnostics connec-
tion/light switch/instru-
ment cluster/deactivat-
ing reverse warning
device/anti-theft pro-
tection with vehicle
tracking 5 A
15 Headlamp range con-
trol/front-compartment
heating 5 A
16 Terminal 87 (1)
Terminal 87 (3)
1 10 A
17 Air bag control unit 10 A
18 Terminal 15 vehicle/
brake light switch 7.5 A
19 Interior lighting 7.5 A
20 Front-passenger door
power window switch/
terminal 30/2 SAM (sig-
nal acquisition and
actuation module) 25 A
21 Engine control unit 5 A
22 Brake system (ABS) 5 A
23 Starter motor 20 A
Terminal 87 (6)
1 10 A No. Consumer Fuse
rating 24 Diesel engine, engine
components/control
unit, vehicles with a nat-
ural gas engine NGT
2 10 A
25 12 V socket (center con-
sole) for tire sealant 25 A
Fuse block F55/1
No. Consumer Fuse
rating 1 Driver's door control unit 25 A
2 Diagnostics connection 10 A
3 Brake system (valves) 25 A
4 Brake system (delivery
pump) 40 A
5 Terminal 87 (2a) engine
M272, OM651 7.5 A
Terminal 87 (2a) engine
OM642, OM651
3 10 A
6 Terminal 87 (1a) engine
OM642
6 10 A
Terminal 87 (1a) engine
OM651
6 7.5 A
Terminal 87 (3a) engine
M272, M271, OM651 7.5 A
7 Headlamp cleaning sys-
tem 30 A
1
Vehicles with code MI6/MH3/XM0.
2 Natural Gas Technology.
3 NAFTA
6 Vehicles with code XM0. Fuses and relays
5 Z

No. Consumer Fuse
rating 8 Anti-theft alarm system
(ATA)/beacon/beacon
with siren 15 A
9 Additional turn signal
module 10 A
Fuse block F55/2
No. Consumer Fuse
rating 10 Radio 1 DIN
Radio 2 DIN 15 A
20 A
11 Mobile phone/tacho-
graph/additional
recorder
4
/navigation
cradle 6 7.5 A
12 Front blower/auxiliary
heating blower setting 1 30 A
13 Auxiliary heating system
digital timer/radio
receiver/DIN slot basic
wiring/FleetBoard/anti-
theft protection with
vehicle tracking 7.5 A
14 Seat heating 30 A
15 Brake system control
unit 5 A
16 Heating, rear compart-
ment heating/ front-
compartment air condi-
tioning 10 A
17 Convenience lighting 10 A
Motion detector 7.5 A No. Consumer Fuse
rating Reading and cargo com-
partment lamp (courier
vehicles) 10 A
Cargo compartment
lighting 7.5 A
18 Rear-compartment air-
conditioning system 7.5 A
Pre-fuse box in the battery compartment in the
footwell on the left-hand side of the vehicle F59
No. Consumer Fuse
rating 1 Preglow relay 80 A
Secondary air pump for
vehicles with a gasoline
engine 40 A
2 Air-conditioning system
cooling fan – cab without
partition and without
rear-compartment air-
conditioning system 60 A
Air-conditioning system
cooling fan – cab with
partition and reinforced
without rear-compart-
ment air-conditioning
system 40 A
4
Latin America only.
6 Vehicles with code XM0. 6
Fuses and relays

Configuration
Fuses
Fuse block F55/3
No. Consumer Fuse
rating 1 Mirror setting/rear win-
dow defroster 5 A
2 Rear window wiper 30 A
3 Auxiliary heating, digital
timer/rear view cam-
era/neutral gate switch,
starting-off aid and all-
wheel drive/engine run-
on/DIN slot basic wiring
(roof)/FleetBoard/anti-
theft protection with
vehicle tracking/emer-
gency hammer lighting in
the rear compartment 5 A
4 Tachograph/ADR work-
ing speed governor/
power take-off/AAG
(trailer control unit) 7.5 A
5 ECO Start/control unit 5 A No. Consumer Fuse
rating EGS (electronic gearbox
control) 10 A
6 All-wheel drive control
unit 5 A
Auxiliary oil pump 10 A
7 ESM (electronic selector
module) 10 A
8 Loading tailgate/tipper
vehicle
PARKTRONIC
6 10 A
9 Rear compartment air
conditioning, compres-
sor clutch, disengagea-
ble reverse warning
device 7.5 A
6
Vehicles with code XM0. Fuses and relays
11 Z

Fuse block F55/4
No. Consumer Fuse
rating 10 Terminal 30, body/
equipment manufac-
turer 25 A
11 Terminal 15, body/
equipment manufac-
turer 15 A
12 D+, body/equipment
manufacturer 10 A
13 Fuel pump FSCM (Fuel
Sensing Control Module) 20 A
Fuel pump relay
1, 3 15 A
14 Trailer power socket 20 A
15 Trailer recognition unit 25 A
16 Tire pressure monitor
PARKTRONIC
7 7.5 A
17 Programmable special
module (PSM) 25 A
18 Programmable special
module (PSM) 25 A
Fuse block F55/5
No. Consumer Fuse
rating 19 Overhead control panel
without ATA (Anti-Theft
Alarm system) and with-
out rain sensor 5 A
Overhead control panel
with ATA (Anti-Theft
Alarm system) 25 A No. Consumer Fuse
rating Overhead control panel
with rain sensor 25 A
20 License plate lamp (cou-
rier vehicles)/perimeter
lamp
3
/identification
lighting 3 7.5 A
21 Terminal 30, body elec-
trics (courier vehicles) 15 A
Rear window defroster
without ATA (Anti-Theft
Alarm system) 30 A
Rear window defroster
with ATA (Anti-Theft
Alarm system) 15 A
22 Rear window defroster 2 15 A
Vehicle socket (courier
vehicles) 20 A
23 12 V left rear socket,
load/rear compartment 15 A
Electric system: non-MB
body 10 A
24 12 V socket under the
base of driver's seat 15 A
25 12 V right rear socket,
load/rear compartment 15 A
26 Hot-water auxiliary heat-
ing 25 A
27 Electrical heater booster
(PTC) 25 A
Auxiliary warm-air heater 20 A
1
Vehicles with code MI6/MH3/XM0.
3 NAFTA
7 Pre-facelift vehicle. 12
Fuses and relays

Fuse block F55/6
No. Consumer Fuse
rating 28 SRB starter relay (fuse
and relay module)
3, 6
Starter for electrical sup- ply support using the
additional battery 25 A
29 Terminal 87 (7), gas sys-
tem, vehicles with a nat-
ural gas engine (NGT)
2 7.5 A
SCR
8
control unit, vehi-
cles with exhaust gas
aftertreatment 3 10 A
Terminal 30, all-wheel
drive, control unit 30 A
30 Auxiliary heat exchanger
fan 15 A
Brake booster
3 30 A
31 Rear compartment heat-
ing blower 30 A
Sliding door closing
assistance, left 15 A
Electric sliding door, left 30 A
32
SCR
8
relay supply, vehi-
cles with exhaust gas
aftertreatment 5 A
KEYLESS ENTRY 10 A
33 Electric sliding door,
right 30 A
Sliding door closing
assistance, right 15 A No. Consumer Fuse
rating ENR (level control) con-
trol unit 30 A
Compressor air suspen-
sion 30 A
34
SCR
8
heater 3 DEF (Die-
sel Exhaust Fluid) supply reservoir, vehicles with
exhaust gas aftertreat-
ment, 6 cyl. diesel 9, 3 15 A
SCR
8
heater 1 DEF ®
,
vehicles with exhaust
gas aftertreatment die-
sel 10 20 A
35
SCR
8
heater 2 hose,
vehicles with exhaust
gas aftertreatment, 6
cyl. diesel 9, 3 15 A
SCR
8
heater 2 DEF, vehi-
cles with exhaust gas
aftertreatment diesel 10 25 A
36
SCR
8
heater 1 delivery
pump, vehicles with
exhaust gas aftertreat-
ment, 6 cyl. diesel 9, 3 10 A
SCR
8
heater control 3
DEF, vehicles with
exhaust gas aftertreat-
ment diesel 10 15 A
3
NAFTA
6 Vehicles with code XM0.
2 Natural Gas Technology.
8 Selective Catalytic Reduction.
9 Vehicles with code MH3.
10 Not for vehicles with code MH3. Fuses and relays
13 Z

Fuse block F55/7
No. Consumer Fuse
rating 37 COLLISION PREVEN-
TION ASSIST/FCW
(Forward Collision Warn-
ing) 5 A
Blind Spot Assist/BSM
(Blind Spot Monitor) 5 A
38 Multifunction camera
with Highbeam Assist 10 A
With a warning when
leaving a lane 10 A
39 Body electrics (courier
vehicles) 7.5 A
Rear-compartment air-
conditioning system 7.5 A
Roof ventilator 15 A
Siren 15 A
40 Auxiliary battery charge
current
11 15 A
41 SAM (signal acquisition
and actuation module)
auxiliary battery refer-
ence voltage
11 7.5 A
42 Rear-compartment air-
conditioning system 30 A
43 Electrical step/sliding
door, right 10 A
44 Electrical step/sliding
door, left 10 A
45 Electrical step, control
system and warning buz-
zer 5 A Fuses in the seat base of the left front
seat
There are additional fuses in the seat base, for
example:
R for the rear-compartment air conditioning
R for the windshield heating
R for other vehicle components, such as
power steering pumps, auxiliary batteries,
battery cutoff relays and PTC heater boos-
ters
R from the body manufacturers for retarders,
loading tailgates, hydraulic pump and tip-
pers
Always have the fuses in the seat base
replaced at a qualified specialist workshop.
11 Vehicles with auxiliary battery. 14
Fuses and relays