Fuses and relays Renault Laguna (X74; 2001-2007)

Renault Laguna 2nd generation was produced in 2001, 2002, 2003, 2004, 2005, 2006 and 2007. During this time, the car underwent a facelift: the radiator grille was slightly changed, and the handling and safety were also improved. 

In this article you will find information on the location of all electronic control units, as well as a description of fuse and relay units for a Laguna (X74) 2nd generation car with diagrams and photographs.

General arrangement

Location of all electronic control units.

1 ABS computer and dynamic stabilization systems
2 Fuel injection computer
3 Accumulator battery
4 Automatic transmission computer
5 CD changer
6 Renault card reader
7 Central switching unit
8 Air conditioner computer
9 Radio and navigation equipment
10 Central display
11 Power window control unit
12 Speech synthesizer computer
13 Side impact sensor
14 Airbag computer
15 Dashboard
16 Steering wheel lock computer
17 Salon central unit
18 Battery discharge warning lamp corrector
19 Computer for storing adjustments of the driver's seat
20 Parking aid computer

In the engine compartment

The main unit in the engine compartment is located next to the battery.

Engine Fuse Box Diagram
Amps / Description
1 (7.5A) Automatic transmission
2 Not Used
3 (30A) Engine management
4 (5A / 15A) Automatic transmission
5 (30A) Brake servo vacuum pump relay (F4Rt)
6 (10A) Engine management
7 Not Used
8 Not Used
9 (20A) Air conditioning system
10 (20A / 30A) Anti-lock braking system / stability control system
11 (20A / 30A) Buzzer (s)
12 Not Used
13 (70A) Coolant Heaters - If Equipped
14 (70A) Coolant Heaters - If Equipped
15 (60A) Cooling fan motor control
16 (40A) Headlamp washers, heated rear window, multifunction control module
17 (40A) Anti-lock braking system / stability control system
18 (70A) Combination switch, daylight system, multifunction control box
19 (70A) Heater / air conditioner, multifunction control unit
20 (60A) Battery current monitor relay (some models), combination switch (some models), daytime running lights, multifunction control box
21 (60A) Power seats, multifunction control module, fuse / relay box, center console, sunroof
22 (80A) Heated windshield (some models)
23 (60A) Windshield wiper, electric parking brake
Relays (Type 1)
R1 Coolant heater relay
R2 Cooling fan motor relay (without A / C)
R3 Not used
R4 Not used
R5 Brake servo vacuum pump relay
R6 Fuel pump relay
R7 Diesel heater relay
R8 Fuel interlock relay
R9 A / C Fan Low Speed ​​Relay
R10 Air conditioner fan relay
R11 Thermoplunger relay 2
Relays (Type 2)
R1 Not used
R2 A / C Fan Low Speed ​​Relay
R3 Not used
R4 Not used
R5 Not used
R6 Fuel pump relay
R7 Heater relay (fuel gas ventilation system)
R8 Fuel pump relay
R9 A / C Fan Low Speed ​​Relay
R10 A / C blower motor relay
R11 Not used

The entire electrical circuit is protected by a main fuse located on the positive battery cable.

In the passenger compartment

Primary fuse box

Located on the left side at the end of the dashboard. 

The relay board (2) is connected to it. 

General form.

Main box diagram
No. Description Amps
1 High beam headlights 20
  • UCH power supply
  • Power supply for fuse box and relay
  • Transponder
  • Reader
  • Engine start button
  • Speech synthesizer
  • Xenon headlight range control
  • Dashboard
  • Heating nozzles
4 Reversing lights - Heating and air conditioning - Parking assistance - + Signal after ignition of the burglar alarm - Electric lock switch lighting - Rain sensor - Heated windshield 20
5 Delayed interior lighting 15
6 Brake lights - Wiper switch - Diagnostic socket - Tire pressure monitor warning lamp - Child safety warning lamp - Rear door electric lock warning lamp - Power window switch lights 20
7 Left headlight low beam 15
8 Right side lights 7.5
9 Direction indicators for direction indication and hazard warning 15
10 Communication System - Car Radio 10
  • Speech synthesizer
  • Dashboard
  • Fog lights
  • Electric tailgate lock
12 Airbags and seat belt pretensioners 5
  • Brake force distribution system
14 Sound signal (horn) 15
15 Power window driver's door 30
16 Passenger door power window 30
17 Rear fog lights 10
18 Heated exterior mirrors 10
19 Low beam, right headlight 15
  • Left side lights
  • Regulated interior lighting and glove compartment lighting
  • License plate light
21 Windscreen and rear window wipers 30
22 Electric central locking 30
  • Socket for additional electrical equipment in the center console
  • Radiotelephone
  • Laguna 2 cigarette lighter fuse
  • Socket for additional electrical equipment in the luggage compartment
  • Electric steering column lock
  • Heated rear window
  • Front seats
  • Prohibiting the inclusion of rear door power windows

Relay box


No. Decoding
SH1 Rear door power window shunt
SH2 Front Power Window Shunt
SH3 Headlamp low beam shunt
SH4 Parking light circuit shunt
R2 Heated rear window
R7 Front fog lights
R9 Windshield wipers
R11 Rear window wiper / reversing lights
R12 Locking doors
R17 Rear window wiper
R18 Temporary activation of interior lighting
R19 Additional electrical equipment
R21 Engine start interlock
R22 "Plus" after ignition switch
R23 Accessories / optional audio system / rear door power windows

Seperate fuse

A separate 20 Amp fuse is located under the ashtray in the center console.
Protects circuits:

  • Car radio;
  • ECU of the air conditioner;
  • ECU of the system of storing the position of the seats;
  • Diagnostic connector;
  • ECU of the navigation system;
  • ECU of the tire pressure monitoring system;
  • Combined display (clock / outside temperature / car radio);
  • Central communication block;
  • ECU of the system of storing the position of the seats;
  • Chains of connection with the alarm system

Auxilary fuse box

On the passenger side, behind the glove compartment, there is an additional fuse box.

No. Description Amps
F26 Trailer electrical connector 30
F27 Sunroof 30
F28 Power window regulator, left rear 30
F29 Power window regulator, right rear 30
F30 Steering wheel position sensor 5
F31 Empty -
F32 Empty -
F33 Empty -
F34 seat heating for driver and passenger 20
F35 Heated front seats 20
F36 Power Seat - Driver Side 20
F37 Power passenger seat 20
17 Power window relay
3 Power seat relay
4 Daytime running headlight warning lamp relay
5 Daytime running light relay
6 Headlight washer pump relay
7 Brake light cut-off relay
Related fuse diagrams
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