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
2	UCH power supply Power supply for fuse box and relay Transponder Reader Engine start button	10
3	Speech synthesizer Xenon headlight range control Dashboard Heating nozzles	10
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
11	Speech synthesizer Dashboard Fog lights Electric tailgate lock	30
12	Airbags and seat belt pretensioners	5
13	ABS ECU Brake force distribution system	5
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
20	Left side lights Regulated interior lighting and glove compartment lighting License plate light	7.5
21	Windscreen and rear window wipers	30
22	Electric central locking	30
23	Socket for additional electrical equipment in the center console Radiotelephone	15
24	Laguna 2 cigarette lighter fuse Socket for additional electrical equipment in the luggage compartment	15
25	Electric steering column lock Heated rear window Front seats Prohibiting the inclusion of rear door power windows	10

Relay box

Diagram.

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.

diagram
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