Scania 4 series is a truck tractor produced with 2-, 3- or 4-axle variants with different power units in 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004 and 2005. In this publication you will find a description of the fuses and relays of the 4th generation Scania with block diagrams and their locations. We will highlight the fuse responsible for the cigarette lighter.

The purpose of the fuses and relays in your Scania 4 series may differ from the one shown and depends on the year of manufacture and the level of equipment. Check the purpose with your diagram on the back of the protective cover or other technical documentation.

Fuse and relay box

The main block with fuses and relays is located in the instrument panel, on the passenger side behind the protective cover.

It consists of two parts. The left one contains fuses and relays for the main equipment (lighting, suspension, engine control, ABS, etc.). The right one contains fuses that are mainly connected to additional equipment (power take-off, independent heater, navigation, etc.)

Scheme

Description of fuses

  1. Odometer, tachograph, buzzer, ABS diagnostics 10A
  2. Flashing lights, speed limiter, axle load limiter 10A
  3. Reverse signals 20A
  4. Engine brake, white smoke limiter 10A
  5. Gearbox 10A
  6. ABS, brake lights 20A
  7. Axle lift, differential lock, power take-off, 10A pressure sensor
  8. Windscreen wipers, windscreen washers 20A
  9. Horn, Fan, Air Conditioner, Temperature Module 20A
  10. Air suspension, steering axles, retarder 10A
  11. Window lifter left side 20A
  12. Window lifter right side, fog lights 20A
  13. Trailer ABS 30A
  14. Tachograph, mileage counter, seat 10A
  15. Interior lighting, central locking, 20A cigarette lighter
  16. Diagnostics, local lighting 20A
  17. Radio equipment, seat 20A
  18. ABS valve relay 20A
  19. Power supply of the engine control unit 20A
  20. EDC Engine Control Unit, Fuel Cutoff 10A
  21. EBS 30A
  22. Heated seats and rear view mirrors 20A
  23. ABS control unit, trailer 5A
  24. Headlight adjustment, air dryer 20A
  25. Instrument panel lighting 10A
  26. Work lighting, roof lighting 20A
  27. Left side light, upper side lights 20A
  28. Right side light 20A
  29. Front and rear fog lights 20A
  30. Left high beam 10A
  31. Right high beam, local lighting 10A
  32. Left low beam 10A
  33. Right low beam, headlight height adjustment 10A
  34. Additional heater, cabin tilt 20A
  35. Heater, temperature control unit, refrigerator 10A
  36. Flame start, power take-off, cigarette lighter , alarm 10A
  37. Fuel heater 20A
  38. Flame start, fuel heater, seat heater 10A
  39. Battery heater, automatic chassis lubrication 10A
  40. Electric sunroof, FMS trip computer, 20A cellular connection
  41. Opticruise, block clock, alarm 10A
  42. EBS 20A
  43. Additional equipment 20A
  44. Filter heating, additional equipment 20A
  45. Additional equipment 10A

Fuse number 15 for 20A is responsible for the operation of the cigarette lighter.

Purpose of the relay

RP1Power supply (bus 15, power supply for fuses 1-13, 18,21,23)
RP2Power supply (bus 15, power supply for fuses 36,37)
RP3High and low beam headlights
RP4Power supply bus 61 (consumers with the engine running)
RP5Power supply bus 58 (parking lights, backlight)
RP6Windscreen wipers, intermittent mode
RP7Brake lights
RP8Additional lights
RP9Electronic Engine Control (EDC) Power Supply
RP10Buzzer
RP11Reversing lights
RP12Front fog lights
RP13Rear fog lights
RP14EDC diode block
RP15Gearbox row shift control
RP16ABS trailer
RP17Reducing the braking force for the additional axle
RP18Depending on the version
RP19Interior heater fan
RP20Interior heater fan
RP21Additional lights
RP22Engine brake (depending on version)
RP23White smoke limiter, starter lock (depending on version)
RP24Air conditioner
RP25Air conditioner
RP26Additional heater
RP27Additional heater
RP28Additional heater
RP29Differential lock, 6-channel ABS (diagonal 1)
RP30Depending on the version, 6-channel ABS (diagonal 2)
RP31Depending on the version, 6-channel ABS diagnostic lamp
RP32Power take-off
RP33Fuel heater
RP34Reserve
Scania 4 series fuses and relays. Scania 4 series fuse diagram.