Renault Laguna 3 – fuse and relay

Renault Laguna 3 generations was produced in 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 and 2016. A station wagon version called Estate appeared on the market at the same time as the hatchback. We provide information with a designation of all electronic control units, fuses and relays of Renault lagoon 3, box diagrams and the purpose of their elements. We will pay special attention to the fuses responsible for the cigarette lighter and sockets.  




  1. ABS electronic control unit
  2. Air conditioning electronic control unit – behind the glove box
  3. Air conditioner / heater fan motor control unit
  4. Accumulator battery
  5. CAN data bus, gateway control unit
  6. Diagnostic connector (DLC)
  7. Driver’s door control unit
  8. Passenger door electrical control unit
  9. Electric parking brake control unit – under the floor
  10. Electronic engine control unit
  11. Coolant pre-heater control unit
  12. 4 Wheel Steering Control Unit – Underbody
  13. Fuse / relay box, engine compartment 1
  14. Fuse / relay box, engine compartment 2
  15. Fuse / relay box, engine compartment 3 – fuses in the engine compartment fuse box – supply circuits: Alternator, engine fuse / relay box 1, engine fuse / relay box 2, instrument panel fuse / relay box 1, multifunction control unit 2, power steering pump, starter.
  16. Fuse / relay box, instrument cluster 1
  17. Fuse / Relay Box, Instrument Panel 2 – With Auxiliary Heater
  18. Xenon headlight control unit
  19. Glow plug relay
  20. Beep 1
  21. Beep 2
  22. Multifunctional control unit 1- functions: central locking, alarm, rear window defroster, horn, immobilizer, direction indicators, interior lamps, keyless entry and start, fog lights, wiper / washer rear window, steering column lock, brake lights, rear door opener drive, windshield washer
  23. Multifunctional control unit 2- integrated with fuse / relay box 1 in the engine compartment – functions: Air conditioning, cooling fan motor, engine oil level sensor, fog lights, fuel pump, headlights, headlight washers, reversing lights, front dimensions, rear dimensions , windshield wipers
  24. Navigation system control unit
  25. Parking Assist Control Module – Behind Right Rear Trim Panel
  26. Power steering control unit
  27. Seat adjustment control unit
  28. Seat heating control unit 1- under the seat
  29. Seat heating control unit 2- under the seat
  30. Seat Heater Relay – Under Seat
  31. SRS electronic control unit
  32. Electronic gearbox control unit

The purpose of the fuses and relays depends on the equipment level of your vehicle.

Engine compartment

The engine compartment contains 3 main boxes with fuses and relays.

Box 1

It is installed in the engine compartment junction box.

The photo 



  • FH1 –  80A Fuse and relay box in the passenger compartment
  • FH2 –  80A Fuse and relay box in the passenger compartment – protection and switching
    unit FH3 – 40A ABS / ESP  ECU
  • FH4 –  80A Fuse and relay box in the passenger compartment
  • FH5 –  60A ECU for air conditioning
  • FH6 –  60A ECU for all steering wheels
  • FH7 –  30A ECU for air conditioning
  • FH8 – Reserve
  • FM1 –  60A Fuse for the electric fan of the cooling system, protection and switching unit
  • FM2 – Reserved
  • FM3 – Reserved
  • FM4 – Reserved
  • FM5 –  70A Preheating unit
  • FM6 – 70A Coolant Heater  Interface Unit
  • FM7 –  70A Coolant Heater Interface Unit
  • FM8 –  20A Fuse for injection computer, fuel heater relay, fan relay when connected in series and in parallel
  • FM9 – Reserved
  • FM10 – Reserved
  • FM11 – Reserved
  • FM12 – Reserved
  • FM13 – Reserved
  • D1 – Standby diode
  • D2 – Standby diode
  • D3 – 49A Diode of the electric fan of the cooling system
  • D4 – Standby diode

Box 2

It is located in the junction box.

The photo


block diagram under the hood


F1(10A) Right headlight fuse, headlight range control
F2(10A)  Fuse for left headlight, tailgate glass switch
F3(15A) Headlamp washers
F4(20A) Fog lights
F5(10A) LH headlamp
F6(10A) RH headlamp
F7(15A) Diagnostic connector, passenger compartment fuse / relay box, gear indicator
F8(30A) ABS / ESP system
F9(30A) Windshield wiper
F10(10A) Airbag / seatbelt ECU, steering column switches
F12(7.5A) Transmission control module (ECM)
F14(15A) Rear and front oxygen sensor, diesel engine sensor
F15(20A) Transmission ECU fuse
F16(5A) Brake light switch, fuel heater relay
F17(10A) Reverse light relay, manual transmission position sensor
F18(15A) CEBS
F19(25A) Starter
F22(10A) Air conditioner
F23(5A) Fuel injection ECU
F24(15A) LH headlights
F25(15A) RH headlamp

Box 3

This box is located in the engine compartment in front of the electronics box.

Box diagram for disconnecting the battery

Block diagram for disconnecting battery

  • F1 –
  • F2 –
  • F3 – 80A Fuse for the + battery supply circuit through the fuse for the fuse and relay block in the passenger compartment, protection and switching unit
  • F4 – 300A  Fuse for generator, fuse box and relay in the engine compartment
  • F5 –
  • F6 – 35A Fuse for supply circuit “+” of the battery through the fuse to the injectors> the fuel pump through the protection and switching unit, the injection computer, the water pump for cooling the bearings
  • F7 – 5A Protection and switching unit fuse

Passenger compartment

It is located at the bottom left of the dashboard.



R1Time delay fuse supply relay F39, F40, F41, F42, F43, F44, F49, F50, F51, F52
R2Heated rear window relay
R3Horn relay
R9Time delay fuse supply relay F45, F46, F47, F48, F53, F54, F55, F56, F57, F58
F5(5A) Interior lamps
F6(5A) Interior rearview mirror
F12(40A) Heated rear window
F18(20A) CEBS
F19(20A) CEBS
F20(10A) CEBS
F21(15A) Alarm ECU, display
F22(15A) CEBS
F23(30A) Passenger door control module
F24(30A) Driver’s door control module
F25(25A) Heated seats
F26(15A) CEBS
F28(30A) Luke
F29(25A) Parking brake
F30(20A) Trailer electrical connector
F31(10A) CEBS
F33(25A) Audio system
F36(20A) Audio system, display
F37(10A) Instrument panel
F40(5A) Brake light switch, ABS and ESP control units
F42(25A) Power seats
F43(25A) Power seats
F44(15A) Luggage compartment bodywork power connector
F48(10A) Second row seat accessory power connector
F49(5A) ECU for air conditioning
F50(30A) Power windows
F51(5A) Interior lighting lamps
F52(5A) Audio system, central locking, emergency alarm
F54(10A) Cigarette lighter fuse
F55(5A) Interior temperature sensor blower
F56(15A) Heated windscreen washer jet, left
F58(40A) ECU for the air conditioner

In Renault lagoon of 3 generations, a fuse 54 at 10A is responsible for the front cigarette lighter. More details in the presented video.

Luggage compartment

This unit is located in the trunk compartment on the battery side.


Trunk block diagram

Circuits protected

  • F1 – Rated current per starter
  • F2 – 250A Battery disconnect unit
  • F3 60A Passenger compartment fuse and relay box


Found a mistake or have something to add, write everything in the comments.

Comments 3

  • Guys, are you really, REALLY sure you’re talking about Laguna 3 here?
    I’d say aou have a mix-up between 3rd gen and the 2nd one. At least cockpit and fuse/relay images do not correspond to the ones of 3rd gen Laguna. I’d say it is from the 2nd gen, but not sure – it is up to you to check.

  • laguna 3 motor yenilemesi yapıldı arac suan rolantıde çalısıyo gaza basınca 1.200 devirde stop ediyo bu nedir hiçbir sekılde cozemiyoruz tesekkurler

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