The Volvo FMX is a special truck model manufactured by Swedish company Volvo Trucks, specially designed for tough off-road and construction work. It is a vehicle with increased strength and functionality for tasks that require a strong chassis, excellent traction and the ability to overcome extreme obstacles. Here is some information about the Volvo FMX:

  1. Durability and design: the Volvo FMX is built to withstand extremely demanding conditions. It has a reinforced chassis, thicker body sheets and other components to provide greater resistance to dynamic loads and tough off-road conditions.
  2. Application: The FMX is ideal for construction work, transporting heavy loads over difficult terrain, and for infrastructure work where off-road capability is required.
  3. Powertrain: the Volvo FMX offers advanced powertrain solutions, including high-torque diesel engines that allow it to tackle steep climbs and unpaved roads efficiently.
  4. Suspension and traction: the FMX features an advanced suspension that improves traction and stability in difficult terrain. Different traction options are available on both axles, depending on the specific requirements of the user.
  5. Safety: the Volvo FMX is equipped with safety systems such as driver assistance systems, collision avoidance systems and blind spot monitoring to help keep you safe in challenging conditions.
  6. Cabin and equipment: Volvo FMX cabs are designed with comfort and functionality in construction conditions in mind. They offer ergonomic solutions, advanced multimedia and navigation systems and spacious interiors.
  7. Sustainable transport: despite its focus on performance in rough terrain, the Volvo FMX also strives for sustainable transport, offering alternative drive options such as gas or hybrid engines.
  8. Many years of experience: the Volvo FMX is rooted in Volvo Trucks’ long-standing experience of producing vehicles adapted to tough conditions. It continues the tradition of reliable off-road trucks.

In summary, the Volvo FMX is a special truck model designed for tough off-road and construction environments. It offers exceptional durability, off-road capability and advanced technology to perform efficiently in demanding environments.

Checking and replacing fuses

As you know, fuses protect against overloading the electrical system of our cars. When a component stops working, it is most likely that a circuit breaker has tripped or a fuse has blown. Therefore, the fuse responsible for the component should be checked before repair. A blown fuse will be indicated by a melted or completely ruptured tape inside the fuse.

Remember this before replacing the fuse!

  • remove the ignition key
  • check that everything has been switched off
  • always replace fuses with the same amperage.

The vehicle’s fuses are designed to protect the electrical installation circuits from overload and are normally only triggered by a short circuit. Therefore, if a fuse has tripped, always have the cause determined by an authorised Volvo workshop.

There are two fuse and relay locations in the cab. The fuse and relay panel (1) can be found in the centre of the instrument panel. The body fuses and relays (2) can be found at the front of the passenger seat.In both places, there is a sticker on the cover or under the cover showing the location of the fuses and relays with a description of the functions.

  1. Fuse and relay control unit
  2. Body fuses and relays

Fuse and relay control unitThe central unit contains two different types of flat-type fuses. If one and the same fuse requires frequent replacement, the vehicle should be taken to an authorised Volvo workshop for an inspection of the electrical system.

When replacing fuses, always use fuses with the specified current rating. Never use fuses with a higher current rating than the specified current rating.

Switch the electrical system to the “Park” power mode and, if possible, close the faulty circuit before replacing the fuse. Leaving the voltage on may cause the fuse holder to burn out.

How to access fuses and relaysTo access the fuse and relay control panel in the center of the dashboard, proceed as follows:

  1. Remove the rubber protection from the glove compartment.
  2. Turn the locking screws 90 degrees counterclockwise using a coin or similar object.
  3. Grasp the handle and pull the cover up.
  4. Remove the cover.

Microwave Oven Fuse

The microwave fuse is located below the fuse and relay panel. The fuse is rated at 50 A.

To access the microwave fuse, follow these steps:

  1. Disconnect the negative terminal from the batteries.
  2. Remove the fuse and relay control unit cover.
  3. Unscrew the screws securing the fuse and relay control unit using a Torx screwdriver.
  4. Carefully lift and assemble the fuse and relay assembly.

Access to body fuses and relays

To access the body fuses and relays, proceed as follows:

  1. Turn the locking screws 90 degrees counterclockwise using a coin or similar object.

List of plate fuses

NumberAmps [A]Description
F 110A12V power outlet
F2
F310ATV/DVD
F 4
F 5
F 65 ABody, switch
F730ABody
F820ABody
F9
F103 AUSB socket
F1115AAdditional light for the roof
F1215ARotating warning light on the roof
F1315ASeat heating / Breathalyzer with ignition lock ALCOLOCK
F14
F1510ARoof light board / Parking lights
F1610AFull lighting in the light board on the roof
F17
F183 A–
F1915ABBM control unit  , body
F2020ARight side window lifter control unit
F213 AControl unit, side display
F225 ASun visor, left and right side
F233 ATACHO control unit  , tachograph
F245 ACombined instrument cluster
F253 ARoad toll collection system
F26
F2710AVehicle Control Unit  VMCU
F2820AVehicle Control Unit  VMCU
F2910AHeated rear-view mirror, right
F3010AHeated rearview mirror, left
F315 ADACU Control Unit  , Driver Support
F3210AAPM Control Unit  , Air Dryer
F333 ARemote control  ( Work Remote Control ), charger
F345 ASafety lock, front cover
F3515AParking air conditioner fan control unit
F365 ACamera
F3720AABS/EBS brake system control unit 
F3820ACCM Heating and Air Conditioning Control Unit 
F3920AFuel line heater
F403 ATachograph ignition
F4115AEMS engine control unit 
F4215AEngine control unit, load
F4310AFuel Filter Heater
F4410AEngine control unit, load
F4530ACabin tilt pump
F4620AABS/EBS system  , trailer
F47
F48
F4950APower output, body
F5030ACoffee machine
F5120AWindshield wiper motor
F5215ASunroof Motor
F535 AVideo switcher
F54
F553 AAlarm
F5610A–
F5710ADriver’s cab lighting
F5815AAmplifier
F5915AVoltage converter
F6015AVoltage converter
F6120ALeft side window lifter control unit
F625 AOBD data transfer connector 
F6310ACIOM control unit  , driver’s cab
F6415A24V power outlet
F6515A24V power outlet
F663 ADynafleet/Telematic
F6715ALighter
F6815AVehicle Control Unit  VMCU
F6915AParking heater
F7020ATECU
F7115AHeadlight washers
F725 A
F7330ABody function active in driving mode
F7420ABody function active in driving mode
F7510ARefrigerator
F7615A–
F77
F78
F79
F803 ALECM Rear Control Panel 
F815 ASRS airbag 
F823 AERA GLONASS Control Unit
F83
F84
F853 AFMS power supply  , driving
F86
F87
F885 ABreathalyzer with ignition lock ALCOLOCK
F89
F9015AElectrically adjustable seat
F9110AFMS Power Connector 
NumberRelay typeDescription
K01ISO micro 10A–
K02ISO micro 10ARefrigerator
K03ISO mini 20ARoof vent motor 2
K04ISO mini 20ARoof vent motor 1
K05ISO mini 20AWindshield wiper motor on/off
K06ISO mini 20AWindshield wiper motor high/low speed
K07ISO power 40 ABody function, fuses
K08ISO power 40 AAccessories
K09ISO micro 10ASeat heating, breathalyzer with ALCOLOCK ignition lock
K10ISO mini 20AAdditional light for the roof
K11ISO power 40 APower amplifier, voltage converter, cabin lighting
K12ISO micro 10ALight board on the roof
K13ISO mini 20ARotating warning light on the roof
K14ISO power 40 A24V power socket, cigarette lighter, breathalyzer with ALCOLOCK ignition lock
K15ISO micro 10AFull lighting in the light board on the roof
K16ISO mini 20AHeadlight washers
K17ISO mini 20ATECU
K18ISO micro 10A–
K19ISO mini 20A–
K20ISO power 40 ABody function ignition, active in driving mode
K21ISO micro 10AElectrically heated rear-view mirrors
K22ISO mini 20AIgnition
K23ISO power 40 A–
K24ISO micro 10AElectrically adjustable seat
K25ISO micro 10A–
K26ISO micro 10ACamera
K27ISO power 40 AEMS engine control unit 
K28ISO power 40 ACabin tilt pump

The main fuses are located in the main fuse box, which is located inside the battery box on the frame. Under normal conditions, the fuses will last the lifetime of the vehicle. If a fuse blows, the vehicle should be taken to an authorised Volvo workshop for an inspection of the electrical system.

The fuses are screwed into the fuse box using nuts with a captive spring washer. It is important that the nuts are tightened to the correct torque, see table. Too little torque can cause heating. Too much torque can cause deformation and cracks.

SizeTightening torques
M54.5Nm ±5%
M820.0Nm ±5%
M1040.0Nm ±5%

Use the correct tightening torque.When replacing fuses, always use fuses with the specified current rating. Never use fuses with a higher current rating than the specified current rating.

NumberAmps [A]Description
1200ABody function
2100AFRC  Driver’s cab, fuse and relay control unit
330AFront Chassis Control Unit  FCIOM
430ACentral chassis control unit  CCIOM
530ARear Chassis Control Unit  RCIOM
630AFront Chassis Control Unit  FCIOM
730ACentral chassis control unit  CCIOM
830ARear Chassis Control Unit  RCIOM
930AFAS front axle control 
1040APCCU  Parking air conditioner
1123 AACM Exhaust Gas Treatment Control Module 
1223 AAdditional axis control

Battery System Fuses The battery system fuses are located on the left side of the starter battery box.

Battery system fuse box

NumberAmps [A]Description
F1 23 ABuilt-in equalizer charger and vehicle batteries
F240AControl unit for battery management and vehicle batteries
F340AControl unit for battery management and starter batteries
Volvo FMX fuses and relays. Volvo FMX fuses and relays fuse diagram.