Page 4 of 18
F
Fuses ...................................................... 3
Fuse box under the left front seat ...... 7
Main fuse box .................................... 3 R
Relays ..................................................... 3
Main fuse box .................................... 7 V
Voltage supply Fuses ................................................. 3 2
Index
Page 5 of 18

Fuses
General safety notes
G
WARNING
If you manipulate or bridge a faulty fuse or if
you replace it with a fus ewith a higher
amperage, 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 correc tamperage.
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 obtai nadvice
from a qualified specialist workshop.
If a new fuse blows again, have the cause
determined and rectified at a qualified
specialist workshop.
The fuses and relays for the standard
equipment 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 left front 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 afuse. Main fuse box
Fuse box in the footwell on the left-hand side of the
vehicle.
X
To open: unlock quick-release fastener
0002 and remove the cover.
X To close: attach the bottom edge of the
cover and fold upwards.
The cover must engage.
X Loc kquick-release fastener 0003. Fuses supplement
3 Z
Page 6 of 18
Configuration
Fuses
The F87 fuse (30 A) for th
eDC/D Cconverter
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 Terminal 87/5 10 A
7 MRM (jacket tube
module) 5 A No. Consumer Fuse
rating 8 Terminal 87 (2) 20 A
9 Terminal 87 (1) 25 A
10 Terminal 87 (4) 10 A
11 Terminal 15 R vehicle 15 A
12 Air bag control unit 10 A
13 Cigarette lighter/glove
box lamp/radio/body
manufacturer loading
tailgate/personal
navigation device (PND)
power socket 15 A
14 Diagnostics
connection/light
switch/instrument
cluster/deactivating
reverse warning device/
anti-theft protection with
vehicle tracking 5 A4
Fuses supplement
Page 8 of 18
No. Consumer Fuse
rating Passenger-
compartment
illumination (reading
lamps or LED light strip) 7.5 A
Convenience lighting 10 A
Reading and load-
compartment lights
(courie
rvehicles) 10 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
Secondary air pump 80 A
40 A
2 Air-conditioning system
cooling fan, cab 60 A
Cab 40 A
3 SAM (signal acquisition
and actuation module)/
SRB (fuse and relay
module) 80 A
4 Auxiliary battery/
retarder
Rear-compartment air-
conditioning system 150 A
80 A No. Consumer Fuse
rating 5 Terminal 30 pre-fuse
boxes, SAM (signal
acquisition and
actuation module)/SRB
(fuse and relay module) 150 A
6 Connection point on the
base of the seat Bridge
7 Passenger compartment
air-conditioning system 80 A
PTC heater booster 150 A6
Fuses supplement
Page 9 of 18
Relays in the main fuse box
No. Relays Description
R1 K40/9 Horn relay
R2 K40/9 Windshield wiper setting 1/2 relay
R3 K40/9 Starter relay, terminal 15
R4 K40/9 Windshield wipers on/off relay
R5 K40/9 Starter relay, terminal 50
R6 K40/9 Relay, terminal 15 R (normally ope
ncontact) R7 K40/9 Engine control unit relay, terminal 87
R8 K40/9 Relay, terminal 15 (reinforced relay)
Fuse box under the left front seat
Fuse box on the outside of the seat base X
To open: move the front seat to the highest
position.
X Press both latching springs 0001down and
remove the cover.
X To close: attach the bottom edge of the
cover and fold upwards.
The cover must engage. Fuses supplement
7 Z
Page 11 of 18

Fuse block F55/4
No. Consumer Fuse
rating 10 Terminal 30, body/
equipment
manufacturer 25 A
11 Terminal 15, body/
equipment
manufacturer 15 A
12 D+, body/equipment
manufacturer 10 A
13 Fuel pump (FSCM)
Fuel pump relay 20 A
15 A
14 Trailer power socket 20 A
15 Trailer recognitio
nunit 25 A
16 Tire pressure monitor/
PARKTRONIC 7.5 A
17 PSM control unit 25 A
18 PSM control unit 25 A
Fuse block F55/5
No. Consumer Fuse
rating 19 Overhead control panel
withou
tATA and without
rain sensor 5 A
Overhead control panel
with ATA 25 A
Overhead control panel
with rain sensor 25 A
20 License plate lamp
(courier vehicles)/
perimeter lamp/
entrance lighting (bus) 7.5 A No. Consumer Fuse
rating 21 Terminal 30, body
electrics (courier
vehicles) 15 A
Rear window defroster
without ATA 30 A
Rear window defroster
with ATA 15 A
22 Electrical step, co-
driver's door (bus) 10 A
Rear window defroster 2 15 A
Vehicle socket (courier
vehicles) 20 A
23 Electric system: non-MB
body
12 V left rear socket,
load/ passenger
compartment 10 A
15 A
24 12 V socket under the
base of driver's seat 15 A
25 12 V socket rear right,
cargo compartment/
passenger compartment 15 A
26 Hot-water auxiliary
heating 25 A
27 Auxiliary warm-air heater
Heater booster system 20 A
25 AFuses supplement
9 Z
Page 12 of 18

Fuse block F55/6
No. Consumer Fuse
rating 28 Starter auxiliary battery/
starte
rrelay power
supply 25 A
29 Terminal 87 (7), gas
system, vehicles with a
natural gas engine
(NGT) 1 7.5 A
SCR
2
control unit,
vehicles with exhaust
gas aftertreatment 10 A
Terminal 30, all-wheel
drive, control unit 30 A
30 Auxiliary heat exchanger
fan 15 A
Brake booster 30 A
31 Sliding door closing
assistance, left 15 A
Electric sliding door, left 30 A
Rear compartment
heating blower 30 A
32
SCR
2
relay supply,
vehicles with exhaust
gas aftertreatment 5 A
KEYLESS ENTRY 10 A
33 Sliding door closing
assistance, right 15 A
Electric sliding door,
right 30 A
Level control (ENR)
control unit 30 A
Compressor air
suspension 30 A No. Consumer Fuse
rating 34
SCR
2
heater 3 DEF
supply reservoir,
vehicles with exhaust
gas aftertreatment 15 A
35
SCR
2
heater 2hose,
vehicles with exhaust
gas aftertreatment 15 A
36
SCR
2
heater 1delivery
pump, vehicles with
exhaust gas
aftertreatment 10 A
Fuse block F55/7
No. Consumer Fuse
rating 37 Unassigned —
38 Unassigned —
39 Body electrics (courier
vehicles) 7.5 A
Passenger compartment
air-conditioning system 7.5 A
Roof ventilator 15 A
Siren 15 A
40 Unassigned —
41 Unassigned —
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 5 A
1
Natural Gas Technology.
2 Selective Catalytic Reduction. 10
Fuses supplement
Page 14 of 18
Relays in the seat base of the left front seat
No. Relays Description
R1 Unassigned —
R2 K41 Load relie
frelay, terminal 15 R3 K41/5 Starter relay, terminal 15
R4 K64
K110 Secondary air injection/secondary air pump relay
SCR relay
2
, vehicles with exhaust gas aftertreatment R5 K27 Fuel pump relay
R6 K23/1 Blower relay, front, blower setting 1
R7 K41/2 Load relief relay, terminal 15 R
R8 K6/1 Starter relay, additional battery
R9 K13/5 Rear window defroster relay 1
R10 K13/6
K51/15 Rear window defroster relay 2
Snow plow relay, low-beam headlamps, left
R11 K117/3
K51/16 Electrical step relay 1, sliding door, left
Snow plow relay, low-beam headlamps, right
R12 K117/4
K51/17 Electrical step relay 2, sliding door, left
Snow plow relay, high-beam headlamps, left
R13 K41/3
K51/18 Load relief relay, terminal 15 (2)
Snow plow relay, high-beam headlamps, right
2
Selective Catalytic Reduction. 12
Fuses supplement