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 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 13 of 18
Fuses in the seat base of the left front
seat
There are additional fuses in the seat base,
for example:
R for the passenger compartment or rear
compartment air conditioning
R for the windshield heating
R for other vehicle assemblies, such as the
power-steering pump, auxiliary battery and
PTC heater
R from the body manufacturers for retarders,
loading tailgates, hydraulic pump and
tippers
Always have the fuses in the seat base
replaced at a qualified specialist workshop. Fuses supplement
11 Z
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
Page 15 of 18

No. Relays Description
R14 K13/7 Windshield heating relay 1
R15 K88 Body manufacturer relay, terminal 15
R16 K88/1 Body manufacturer relay, terminal 61 (D+)
R17 K95
K93
K122 Loading tailgate relay
Comfort illumination relay
LED light strip relay, passenge
rcompartment
lighting R18 K2 Headlamp cleaning system relay
R19 K51/10
K118 Beacon with siren relay
Entrance lighting relay (bus)
R20 K39/3 ATA (anti-theft alarm system) relay, horn
R21 K108
K116
K23/2 Perimeter lamp relay
License plate lamp relay (courier vehicles)
Blower relay, hot-air auxiliary heating, blower setting
1 R22 K23/3 Blower relay, hot-air auxiliary heating, blower setting
2
R23 K39/1
K124/1 Siren relay
Terminal 61 (D+) relay, anti-theft protection with
vehicle tracking
R24 K117/1 Electrical step relay 1, sliding door, right/co-driver's
door (bus)
R25 K117/2 Electrical step relay 2, sliding door, right/co-driver's
door (bus)
R26 K121
K124 Reverse warning device off relay
Anti-theft protection with vehicle tracking relay
Other relays
No. Relays Description
— K57 Battery cutoff relay
— K57/4 Auxiliary battery relay, right-hand-drive vehicle
— K9 Air-conditioning system relay, auxiliary fan (duo) Fuses supplement
13 Z