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. 
Contents
Locations
Diagram
Description
- ABS electronic control unit
- Air conditioning electronic control unit – behind the glove box
- Air conditioner / heater fan motor control unit
- Accumulator battery
- CAN data bus, gateway control unit
- Diagnostic connector (DLC)
- Driver’s door control unit
- Passenger door electrical control unit
- Electric parking brake control unit – under the floor
- Electronic engine control unit
- Coolant pre-heater control unit
- 4 Wheel Steering Control Unit – Underbody
- Fuse / relay box, engine compartment 1
- Fuse / relay box, engine compartment 2
- 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.
- Fuse / relay box, instrument cluster 1
- Fuse / Relay Box, Instrument Panel 2 – With Auxiliary Heater
- Xenon headlight control unit
- Glow plug relay
- Beep 1
- Beep 2
- 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
- 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
- Navigation system control unit
- Parking Assist Control Module – Behind Right Rear Trim Panel
- Power steering control unit
- Seat adjustment control unit
- Seat heating control unit 1- under the seat
- Seat heating control unit 2- under the seat
- Seat Heater Relay – Under Seat
- SRS electronic control unit
- 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 
Diagram
Assignment
- 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
Diagram
Designation
| 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 |
| F11 | – |
| F12 | (7.5A) Transmission control module (ECM) |
| F13 | – |
| 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 |
| F20 | – |
| F21 | – |
| 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
- 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.
Diagram
Designation
| R1 | Time delay fuse supply relay F39, F40, F41, F42, F43, F44, F49, F50, F51, F52 |
| R2 | Heated rear window relay |
| R3 | Horn relay |
| R4 | |
| R5 | |
| R6 | |
| R7 | |
| R8 | |
| R9 | Time delay fuse supply relay F45, F46, F47, F48, F53, F54, F55, F56, F57, F58 |
| R10 | |
| F1 | |
| F2 | |
| F3 | |
| F4 | |
| F5 | (5A) Interior lamps |
| F6 | (5A) Interior rearview mirror |
| F7 | |
| F8 | |
| F9 | |
| F10 | |
| F11 | |
| F12 | (40A) Heated rear window |
| F13 | |
| F14 | |
| F15 | |
| F16 | |
| F17 | |
| 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 |
| F27 | – |
| F28 | (30A) Luke |
| F29 | (25A) Parking brake |
| F30 | (20A) Trailer electrical connector |
| F31 | (10A) CEBS |
| F32 | – |
| F33 | (25A) Audio system |
| F34 | – |
| F35 | – |
| F36 | (20A) Audio system, display |
| F37 | (10A) Instrument panel |
| F38 | – |
| F39 | – |
| F40 | (5A) Brake light switch, ABS and ESP control units |
| F41 | – |
| F42 | (25A) Power seats |
| F43 | (25A) Power seats |
| F44 | (15A) Luggage compartment bodywork power connector |
| F45 | – |
| F46 | – |
| F47 | – |
| 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 |
| F53 | – |
| F54 | (10A) Cigarette lighter fuse |
| F55 | (5A) Interior temperature sensor blower |
| F56 | (15A) Heated windscreen washer jet, left |
| F57 | – |
| 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.
Scheme
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.
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.
Thanks.
Apparently, the model refresh (2011) made it look more like the Megane
laguna 3 motor yenilemesi yapıldı arac suan rolantıde çalısıyo gaza basınca 1.200 devirde stop ediyo bu nedir hiçbir sekılde cozemiyoruz tesekkurler