Mercedes-Benz Actros MP4 represents the 4th generation of the Actros model range, which was produced in 2013, 2014, 2015, 2016, 2017, 2018. In this post, we will show a description of the fuses and relays of the Mercedes Actros MP4 with a block diagram and its location. We will note the cigarette lighter fuse.

Fuse and relay block

The main fuse and relay block is located in the passenger compartment, at the bottom of the instrument panel on the passenger side.

For access, open the latches (2) and remove the cover (1).

The design of the unit and the purpose of the elements in it may differ from the one presented and depends on the year of manufacture and the level of electrical equipment. Check the designations with your diagrams on the back of the protective cover.

Option 1

Option 2

Location map

Description

  1. Relay module A32
  2. Fuses, relays and diodes in the main module (GM)
  3. Relay module A31.
  4. Fuses of modules A1 and A2.

Relay module A32

№Description
K1Windshield heating system
K2Windshield heating system
K3Additional headlight – clamp 56a
K4Reserve
K5Reserve
K6Reserve

Master Module (GM)

SCA

Fuses

№CurrentDescription
F220ADriver’s door control unit
F320AFront passenger door control unit
F420ADriving mode control system
–20ATachograph – clamp 30
F515AProgrammable special module
–15ADistributor clamp 30
F625AFan
–25AIndependent electric air conditioning system
F725ARadio/navigation system
–25AVoltage transformer 12 V
–25ADistributor clamp 30
F820ARefrigerated box
–20AAdditional heating system
–20AVoltage transformer 12 V
–20AAdaptive driving parameter prediction system control unit – terminal 30
–20ALSVA (charges for transporting heavy goods depending on the vehicle’s carrying capacity)
F910ADiagnostic connector
F1010AHeating system
–10ADistance sensor
–10ADriver assistance system – clamp 30
F1110AToll Collect system
–10ACeiling lights for additional compartment lighting in the rear wall
–10AReading lamp
–10ATelephone
–10ATire pressure monitoring system
–10AFleet Management System – Clamp 30
–10AERA-GLONASS
F1215ASliding top hatch
–15AEDW system (anti-theft alarm system)
–15ALSVA (charges for transporting heavy goods depending on the vehicle’s carrying capacity)
–15ASteering wheel angle sensor
F1325AGround clearance adjustment system
–25AHydraulic clutch (retarder turbo clutch)
–25ARetarder
F1410ABody manufacturer – clamp 30
F1520ATrailer
–20ATrailer voltage transformer – clamp 30
F1620ATrailer ABS system – clamp 30
F175AIgnition switch
–5ACentral Internet Gateway
F185AModular switch panel
–5AVoltage transformer with remote output
–5AInstrument combination – clamp 30
F196ACigarette lighter
–15APower socket – terminal 15
F2020ASeat heating system
–20ADistributor clamp 15
F2115AFuel pre-filter heating system with water separator
–15ADistributor – D+ terminal
F2210ABody manufacturer – D+ clamp
–10AFuel pre-filter heating system with water separator
F235ABlueTec® exhaust gas aftertreatment system
–5ASunshade
–5ATowbar (low-mounted towbar system)
–5AToll Collect system
–5AMounting socket for MEILLER retrofitting
–5AHydraulic Auxiliary Drive (HAD) – Clamp 15
–5AERA-GLONASS
F245AInstrument combination
–5ABattery disconnector
–5ATachograph
–5ABrake system
–5AAirbag
–5ATelephone
–5ATransmission control system
–5AFleet management system
–5AAdditional headlight
F2510ATrailer ABS system
F2610ADriving mode control system
–10ACustomizable special module – clamp 15
F2710AEngine control – terminal 15
–10AReversing camera
–10ADriver assistance system
–10AAdaptive driving parameters prediction system control unit – clamp 15
F2810ARetarder
–10AHydraulic clutch (retarder turbo clutch)
–10AElectronic air preparation unit – terminal 15
F2915ATransmission control system – clamp 30.1
–15ACB radio station
F3020ABrake system – clamp 30.2
F3115ATrailer brake light
F3225A24V power sockets
–25AAdditional 24V power socket
F3310ACeiling lights for additional roof compartment lighting
–10AVoltage transformer with remote output
F3425A24V high-power power supply socket
–25AVoltage transformer 12 V
–15AElectrical equipment of the body of another manufacturer
F35Reserve
F3620AElectronic air preparation unit – terminal 30
F3715ATransmission control system – clamp 30.2

Relay

№Description
K1Gain – clamp 15
K2Gain – D+ terminal
K3Gain – clamp 15
K4Gearbox oil cooling
K5Gain – clamp 15
K6Trailer brake light
K7Bistable relay
K8Bistable relay
K9Reserve
SSAM

Fuses

№CurrentDescription
F120ABrake system – clamp 30.1
F210ADiagnostic connector
F315AAdditional heating system
–15AAdaptive driving parameter prediction system control unit
–15AVoltage transformer 12 V
F410AToll Collect system
–10ASteering wheel angle sensor
–10ATelephone
–10AFleet management system
–10ATire pressure monitoring system
–10ACeiling lights for additional compartment lighting in the rear of the vehicle – clip 30
–10AERA-GLONASS
F515ALSVA (charges for transporting heavy goods depending on the vehicle’s carrying capacity)
–15ASliding top hatch
–15AEDW system (anti-theft alarm system)
–15ACB radio station
F610AHeating system
–10ADriver assistance system
–10AReading lamp – clamp 30
–10ADistance sensor
F720AElectronic air preparation unit – terminal 30
F825AGround clearance adjustment system
–25ARetarder
F910ABody manufacturer – clamp 15
–10AToll Collect system
–10ABlueTec® exhaust gas aftertreatment system
–10AERA-GLONASS
F1020ATrailer brake light
–20ABody manufacturer installed brake light
F1120AProgrammable special module
–20ACooler box – clamp 30
F1220ADriving mode control system
–20ATachograph – clamp 30
F1325AVoltage transformer 12 V
–25ARadio/navigation system – clamp 30
–25AHydraulic clutch (retarder turbo clutch)
F1410ABody manufacturer – clamp30
F1515ATransmission control system – clamp 30.1
F1610ATrailer ABS system
F17Reserve
F1815ASeat heating system
F19Reserve
F2025A24V high-power power supply socket
–15AElectrical equipment of the body of another manufacturer
–15ACB radio station
F2115AFuel pre-filter heating system with water separator
–15ADistributor – D+ terminal
F2210ABody manufacturer – D+ clamp
10AFuel pre-filter heating system with water separator
F23Reserve
F24Reserve
F2520ATrailer ABS system
F2620ATrailer
20ATrailer voltage transformer – clamp 30
F2720ADriver’s door control unit
F28Reserve
F2920AFront passenger door control unit
F30Reserve
F31Reserve
F3210ACeiling lights for additional roof compartment lighting
–Voltage transformer with remote output
F3325A24V power sockets
–25AAdditional 24V power socket
F34Reserve
F3525AFan
F365AHydraulic Auxiliary Drive (HAD)
–5AMounting socket for MEILLER retrofitting
–5ATachograph
–5AInstrument combination
–5ABrake system
–5AAdditional headlight
–5AAirbag
–5ALSVA (charges for transporting heavy goods depending on the vehicle’s carrying capacity)
–5AAdaptive driving parameter prediction system control unit
–5ATelephone
–5AFleet management system
–5ATransmission control system
–5ABattery disconnector – clamp 15
F3720ABrake system – clamp 30.2
F3810ADriver assistance system
–10AReversing camera
–10AEngine control – terminal 15
–10ASwap body – clamp 15
F3915ATransmission control system – clamp 30.2
F4010ADriving mode control system
–10ACustomizable special module – clamp 15
F4110ARetarder
–10AElectronic air preparation unit – terminal 15
F425ACigarette lighter
–15APower socket

Relay

№Description
K1Reserve
K2Gain – D+ terminal
K3Gearbox oil cooling
K4Gain – clamp 15
K5Gain – clamp 15
K6Trailer brake light
K7Gain – clamp 15
K8Bistable relay
K9Bistable relay

Relay module A31

Scheme

Transcript

K1Working light
–Swap body
K2Oil cooling of the transfer case
K3Fuel pre-filter heating system with water separator
K4Tail lift
–Disabling the auxiliary hydraulic drive (HAD)
K5Tail lift
–Disabling the auxiliary hydraulic drive (HAD)
K612V radio receiver – terminal 58
K712V radio receiver – 15R clamp
–Subwoofer
K8Additional headlight – clip 58
K9Interior lighting with a low roof
K10Interior lighting with a low roof

Modules A1 and A2

Scheme

Appointment

№CurrentDescription
A1
F15ACabin tilt pump
F210ATail lift
F310AFlashing beacon
F410AWorking light
–10ASwap body
F510AIlluminated Mercedes-Benz triangular star
–10APortable lamp power socket
F615AElectrical equipment of the body of another manufacturer
F725AWindshield heating system
F825AWindshield heating system
F910AOil cooling of the transfer case
–10AHydraulic Auxiliary Drive (HAD)
F1015AFuel pre-filter heating system with water separator
F1120AIndependent electric air conditioning system
F1215AHydraulic Auxiliary Drive (HAD)
F13Reserve
F14Reserve
A2
F110AMounting socket for MEILLER retrofitting
F220AElectrical equipment of the body of another manufacturer 2 and 3
–20ABody additional axle switch
F310AControlled auxiliary bridge
F415AAdditional headlight
F510AAir supply control system
F610ASubwoofer
F75AEquipment in accordance with the regulations for the transport of dangerous goods by road, for England
F85AInterior lighting with a low roof
F95ACB radio station
F1015ARadio/navigation system
F115AIndependent electric air conditioning system
–5AAntenna amplifier
–5ACornering assistant
F1210A12V radio receiver
F13Reserve
F14Reserve

Checking the fuses

Some fuses don’t look like the ones you’re used to seeing in cars, but their functionality is the same. Conventionally, they can all be divided into fuses and automatic ones.

Checking the fuse

  1. Remove the fuse from the module using pliers and visually inspect it.
  2. If the fuse wire is blown, replace the faulty fuse with a spare fuse.
  3. Turn on the electrical consumers and check their operation. If the fuse blows again, contact a specialized workshop with qualified personnel to check the electrical equipment.

Checking the circuit breaker

When the circuit breaker trips, the pin (4) moves to the off position (2).

  1. Remove the circuit breaker from the module.
  2. Push the pin (4) into the on position (1).
  3. Press the release button (3).
    – If the pin (4) moves to the off position (2), the circuit breaker is OK.
    – If the pin (4) does not move to the off position (2), the circuit breaker needs to be replaced.
  4. Press the pin (4) into the on position (1) and reinsert the circuit breaker.
  5. Turn on the electrical consumers and check their operation. If the circuit breaker trips again, contact a specialized workshop with qualified personnel to check the electrical equipment