Volvo FH 12 represents the 1st generation of the heavy-duty truck family, which was produced in 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003 and 2004. During this time, the model has undergone restyling. In our material you will find a description of the fuses and relays of the Volvo FH 12 with block diagrams, photos and their locations. We will highlight the fuse responsible for the cigarette lighter. This material will also be useful to owners of the Volvo FH 12 .

The purpose of fuses and relays may differ from the one presented and depends on the year of manufacture, modification and level of electrical equipment of your car. Compare the information with your diagrams on the cover of the unit.

Blocks in the cabin of Volvo FH 12 16

Block layout diagram

Block D

For access, you must remove the protective cover.

The block itself will look something like this

Option 1

Scheme

Description

Fuses

  • F1 – low beam headlights, left
  • F2 – right dipped beam headlights
  • F3 – autonomous heater, Webasto, radio
  • F4 – brake, stop signal lights, stop signal fuse
  • F5 – reversing lights, generator charging lamp, generator excitation, reversing fuse
  • F6 – interior lighting, radio, central locking fuse, interior lighting and sockets
  • F7 – emergency alarm
  • F8 – turns, signal lights
  • F9 – tachograph, clock, hazard warning light (alarm), lighting, fuse for instruments and tachograph
  • F10 – air conditioning, interior heating fan motor
  • F11 – automatic transmission, transmission control unit fuse
  • F12 – windshield wiper and washer motor, wiper and washer
  • F13 – headlight washers, headlight wiper fuse
  • F14 – spotlight, additional headlights, spotlight fuse
  • F15 – engine preheating – glow plugs, glow plug fuse
  • F16 – cigarette lighter  , converter
  • F17 – front fog lights, rear fog light fuse
  • F18 – EDC engine control unit
  • F19 – high beam, left side, fuse on the wiring diagram for the left headlight
  • F20 – high beam right side, fuse on the wiring diagram for the right headlight
  • F21 – 24 volt sockets, lighting bulb, interior lighting fuse
  • F22 – reserve
  • F23 – air suspension, frame lift
  • F24 – dimensions left side
  • F25 – spotlight
  • F26 – trailer parking light left side, fuse on the parking light wiring diagram
  • F27 – air conditioner
  • F28 – dimensions right side
  • F29 – EDC engine control unit
  • F30 – trailer parking light
  • F31 – differential lock, power take-off mechanism
  • F32 – sound signal, additional equipment
  • F33 – driver’s side window regulator
  • F34 – central locking, passenger side power window
  • F35 – low beam
  • F36 – mirror heating

Relay Volvo FH 12 16

  • 302 – Lighting relay (additional spotlight)
  • 305 – Reverse light relay
  • 306 – Headlight low beam relay
  • 307 – Headlight high beam relay
  • 308 – Brake light bulbs, brake light relay
  • 309 – Relay dimensions
  • 315 – Starter relay
  • 343 – Rear fog light relay
  • 375 – Daytime running light relay, Generator

Option 2

Volvo FH 12 16 fuses

  • F1 Air suspension, hydraulic trolley lift
  • F2 Area inhibitors, compressor control
  • F3 Airbag, immobilizer
  • F4 Central locking
  • F5 Interior lighting, timer
  • F6 Trailer feet
  • F7 Devices
  • F8 Voltage divider for radio
  • F9 Stops
  • F10 Spotlight
  • F11 High beam blink
  • F12 Air suspension
  • F13 Electric heated rear-view mirrors
  • F14 “radiopos” relay heating
  • F15 Low beam LHS
  • F16 High beam LHS
  • F17 “Radiopos”
  • F18 Cooling fan control, heating relay
  • F19 Car ECU
  • F20 Engine solenoid valves
  • F21 Devices, electric heated mirror relay
  • F22 Daylight
  • F23 Dehumidifier heating
  • F24 Additional equipment
  • F25 Electric rear-view mirrors
  • F26 Differential lock, power take-off
  • F27 Electronic climate control
  • F28 Turn signal, instruments
  • F29 Horn
  • F30 Cigarette lighter
  • F31 Voltage divider 12V
  • F32 Rear fog lights
  • F33 Left side marker light
  • F44 Trailer side marker light, left
  • F55 Luggage compartment lighting
  • F56 Side marker light right trailer
  • F57 Right side marker light
  • F58 Turn signal, hazard warning
  • F59 Near right
  • F30 High beam right
  • F31 Electric window, passenger side
  • F32 Electric window, driver’s side
  • F33 Engine ECU
  • F34 Reverse light, reverse warning, alarm
  • F35 Fan, air conditioning unit
  • F36 El Heated seats, parking heater
  • F37 Windshield wiper
  • F38 Windscreen wiper and headlight washer

Relay Volvo FH 12 16

  • 301 Fog light relay “9” (CG5)
  • 305 Relay, reversing lights “12” (EA7)
  • 306 Relay full beams “11” (CE55)
  • 307 Low beam relay “3” (CE48)
  • 308 Relay, brake lights truck “8” (CK8)
  • 308V Relay, brake lights trailer “10” (CK15)
  • 309L Relay, side lights left “1” (CE19)
  • 309R Relay, right side marker lights “2” (CE26)
  • 315R Relay, starting switch “4” (AA42)
  • 343 relay, rear fog lights “7” (CG12)
  • 348A Relay, fan, climate unit “13” (HA 6)
  • 360 Relay, power take-off inhibitor “14” (LD3) (LE4)
  • 379 Relay, fuel injection “5” (AC17)
  • 3005 Generator controlled relay “6” (AA52)
  • 3101 Relay, internal lamps “15” (ER13) (ES13)

Block E

Volvo FH 12 16 connectors

  • X1 – Free
  • X2 – Automatic transmission “AG2”
  • HZ – Automatic transmission “AGS1”
  • X4 – Air suspension “BL”
  • X5 – Anti-blocking system “AS”

Fuses Volvo FH 12 16

  • P1 – Additional heater (20A)
  • P2 – Additional heater (15A)
  • RZ – Free
  • P4 – Free
  • P5 – Electric seat heating (15A)
  • P6 – Electrical input 12V (15A)

Fuses Volvo FH 12 16

  • P1 – Electric valve, anti-blocking system
  • P2 – Electric valve, anti-blocking system
  • RZ – Relay, control unit (5A)
  • P4 – Information block (5A)
  • P5 – Diagnostic input (5A)
  • P6 – Trailer power (25A)
  • K1 – Searchlights “302”
  • K2 – Air suspension, level adjustment “3014A”
  • KZ – Air suspension, level adjustment “3014V”
  • K4 – Air suspension “3014S”
  • K5 – Seat adjustment “3076”
  • KB – Electrically heated rear-view mirrors
  • K7 – Air suspension, trolley lift “314D”
  • K8 – Air suspension, lift strut “314E”
  • K9 – Automatic transmission, EEC. engine braking ADR 345V 318A 309AV
  • K10 – Automatic transmission, EEC, engine braking ADR “3073” “318V” “309AL”

Volvo FH 12 16 anti-lock system fuses

  • K1 – Electric valve, anti-blocking system
  • K2 – Brake lights, trailer
  • Short circuit – Electrovalve, anti-blocking system
  • K4 – Indicators, anti-lock braking system

Block H

Additional equipment block (optional). Located at the bottom right of the diagram. There may be protection elements here: Air conditioner, Control unit, Parking heater (water), etc.

Block G

Electronic blocks

  1. Multifunction relay
  2. EDC system
  3. Lighting relay
  4. Centralized locking
  5. Rack lift, A-type
  6. Rack lift (ATV), stroke (A-type, pneumatic)
  7. Rack extension (ATV). A-type
  8. Dim-Dip (United Kingdom)

Block F

  • S1 – Diagnostic device key
  • X1 – Engine control unit, driver information system
  • X2 – Anti-blocking system

Body electrical circuit

Fuses

  • F1 – Battery -30
  • F2 – Battery -30
  • F3 – Start switch “15”
  • F4 – Start switch “15”
  • F5 – Alternator “61” (5A)
  • F6 – Parking lights (5A)

Relay

  • K1 – Power supply through fuses 3 and 4

A high-power fuse block can also be installed next to the battery.

Appointment

A high-power fuse block can also be installed next to the battery.

  1. 125A Pre-heating
  2. 200A Hydraulic Trolley Lifting Mechanism / Body Manufacturer
  3. 125A Cabin
  4. 40A Secondary power supply for lights
Fuses and relays Volvo FH 12 16. Fuse diagram Volvo FH 12 16.