The relay box.

The relay box is a control and distribution module. All of the vehicle’s main 12-volt circuits are protected here, including various electrical devices, main circuits, and supply lines, for example. 

The relay box includes various blade fuses. The purpose of each fuse can also be identified by the pictograms shown. 

1. 12-volt supply lines (20 amps)
   • Cab hot-water heater
   • 12-volt and USB charging outlets
   • Main fuse for the multimedia main switch
   • Load module via the central panel main switch
   • Garage outlet
2. Eis-Ex heater (5 amps)
3. Radio/navigation system and radio amplifier (20 amps)
4. SOS slot (more information)
5. Load module (20 amps)
6. Spare
7. Multimedia system (20 amps)
   • Central panel main switch
   • Radio/navigation system
   • Satellite system
   • TV lift
   • TV
8. Light module/light group "A" (15 amps)
9. Light group "B"/motion detector light (10 amps)
10. 230-volt shore power detection (7.5 amps)
11. Spare
12. Water pump/water pump button on the central panel (10 amps)
13. 12-volt supply lines (10 amps)
    • Hot-water heater/circulation pump
    • Router
    • Gas tank gauge
14. 12-volt supply lines (20 amps)
    • Light module
    • Gas detector
    • Remote gas shutoff valve for gas tank
    • Roof fan
15. Switching signal for remote gas shutoff valve (7.5 amps)
16. Entrance door control (10 amps)
17. Refrigerator (20 amps)
18. Step/central locking system (25 amps)

Defective fuses in the relay box are illuminated in red, making a defect easy to identify.