Fuse and relay box diagrams – Volvo FH
Main fuses
The main fuses are located in the main fuse box inside the chassis battery box.
| Fuse | Rated Current [A] | Description |
| 1 | 125 | Heating |
| 2 | 200 | Hydraulic Lift / Body |
| 3 | 125 | Cab |
| 4 | 40 | Secondary lighting supply |
Fuse and relay box
The fuses in the electrical distribution unit are knife-type fuses, two different types are used.
| Number | Description | Amps [A] |
| F1 | TPM | 10 |
| F2 | Lighting, loading area | 10 |
| F3 | Charging lamp;
Saddle lighting. |
10 |
| F4 | Electrically adjustable seat;
Cab tilt pump; Fifth wheel loading and lighting. |
5 |
| F5 | Instrumentation (cl. 30) | 5 |
| F6 | Dehumidifier | 5 |
| F7 | Vehicle control unit;
Electronic immobilizer. |
5 |
| F8 | Instrumentation, TPM | 5 |
| F9 | Range lock, area lock (on gearbox) | 5 |
| F10 | NOx sensor;
Toll. |
5 |
| F11 | Control unit shift lever | 5 |
| F12 | Drive/Control Unit Converter | 10 |
| F13 | Wipers | 15 |
| F14 | Lighter, lamp compartment, center section | 10 |
| F15 | Water separator;
Fuel filter heater; Water drain valve. |
10 |
| F 16 | Differential lock;
Power take-off. |
5 |
| F17 | Control unit outdoor lighting | 5 |
| F18 | Horn;
Compressed air solenoid valve for horn. |
10 |
| F19 | Climate unit;
FMS gateway. |
5 |
| F20 | Central locking;
Parking lot heater. |
10 |
| F21 | Fan;
Air Conditioner. |
15 |
| F22 | Courtesy Light | 10 |
| F23 | Air Suspension | 5 |
| F24 | Dehumidifier;
ADR Parking Lot Heater; Electrically heated mirrors. |
10 |
| F25 | Power supply;
ABS/EBS Trailer. |
20 |
| F26 | Fuse box for the body | 30 |
| F27 | Electric elevator window on the left side;
Electrically heated rear-view mirrors. |
20 |
| F28 | ABS/EBS | 20 |
| F29 | Coffee maker | 30 |
| F30 | Electric right side window elevators | 20 |
| F31 | Main fuse for fuses 95-97 | 20 |
| F32 | Climatic unit | 20 |
| F33 | Cab tilt | 30 |
| F34 | Amplifier | 30 |
| F35 | Electrically adjustable seat | 20 |
| F36 | Reverse light circuit, trailer | 15 |
| F37 | Phone;
Dynafleet. |
5 |
| F38 | Input Lamps | 5 |
| F39 | Electrically adjustable mirrors | 5 |
| F40 | Motor control unit | 15 |
| F41 | Solenoid valves in the engine;
Electric fuel pump. |
10 |
| F42 | Relay motor preheating;
Electrically controlled cooling fan. |
5 |
| F43 | BBM bodybuilder control unit | 5 |
| F44 | Voltage converter for radio/12-volt socket | 15 |
| F45 | Voltage converter for 12 volt socket | 15 |
| F46 | Rotating warning light | 15 |
| F47 | ACC | 5 |
| F48 | ABS/EBS, EBS switch | 5 |
| F49 | Air suspension | 3 |
| F50 | Phone | 5 |
| F51 | Hydraulically controlled shaft | 5 |
| F52 | Air intake heating;
Relief relay radio position. |
10 |
| F53 | Roof light signal | 10 |
| F54 | Dynafleet, FMS gateway | 10 |
| F55 | Airbag;
Seat belt pretensioner. |
5 |
| F56 | Free | 5 |
| F57 | Control unit/Retarder lever | 3 |
| F58 | D+ short-circuit relay, ADR only | 5 |
| F59 | Reversing Camera, Dynafleet | 5 |
| F60 | Hydraulically Controlled Axle | 5 |
| F61 | Theft Alert;
Volvo Connection (SAM); Folding rear view mirror arm, Japan. |
5 |
| F62 | Free | 15 |
| F63 | Alcoholic system | 10 |
| F64 | Rate system | 10 |
| F65 | Central Lubrication System | 10 |
| F66 | Opening roof | 10 |
| F67 | Floor lamps;
Reading lamps. |
10 |
| F68 | Refrigerator | 10 |
| F69 | 12 V output | 10 |
| F70 | ABS/EBS, towing (cl. 15) | 5 |
| F71 | Accessories | 10 |
| F72 | Level adjustment system, headlights | 5 |
| F73 | Hydraulically controlled shaft | 5 |
| F74 | Headlight washer (high pressure) | 15 |
| F75 | Electrically heated seats | 15 |
| F76 | ADR D+ short-circuit relay;
Fan instrument panel. |
5 |
| F77 | 24 volt power socket on dashboard | 10 |
| F78 | 24 volt power socket, next to the bun | 10 |
| F79 | 12 V for TV | 10 |
| F95 | Central locking system | 10 |
| F96 | Anti-theft alarm | 5 |
| F97 | Parking Lot Heater | 15 |
LCM Fuses
| Number | Description | Amps [A] |
| 1 | Trailer turn signal lights, brake and low beam lights, right side, reversing lights, rear parking lights | 25 |
| 2 | Left side headlights, fog lights, warning light, warning signal | 25 |
| 3 | Trailer brake lights and rear turn signals, left side, high beam, right side | 25 |
| 4 | Trailer parking lights and rear turn signals, right side, left side brake light | 25 |
| 5 | Reverse trailer lights, front right parking lights, pass lights and trailer turn signals, left side | 25 |
| 6 | Trailer parking lights and front parking lights, left side, front turn signals | 25 |
Fuses in the battery box
| Number | Description | Amps [A] |
| 1 | Tachograph | 5 |
| 2 | Main Fuses F95-F97 | 20 |
| 3 | AdBlue System | 20 |
To superstructure
56 X. Fuses for superstructure
| Number | Description | Amps [A] |
| 1 | Cl.30, B+ | 15 |
| 2 | Cl.30, B+ | 15 |
| 3 | Cl.15, driving position | 15 |
| 4 | Cl.15, driving position | 15 |
| 5 | Kl.61, alternator | 10 |
| 6 | Free | 10 |
56 P. Recessed tracks (options)
| Number | Description | Amps [A] |
| 1 | Cl.30, B+ | 15 |
| 2 | Cl.30, B+ | 15 |
| 3 | Cl.30, B+ | 15 |
| 4 | Cl.30, B+ | 15 |
| 5 | Free | 10 |
| 6 | Free | 10 |
Body relays in front of the passenger seat
| Number | Description |
| 37 | Parking lights |
| 38 | Pressure selection, tipping trailer |
| 39 | Free |
| 40 | Free |
| 41 | Free |
| 42 | Headlights |
| 43 | External engine start |
| 44 | Reversing light |
| 45 | Brake actuation (reverse gear lock) |
| 46 | Free |
| 47 | Free |
