Fuses and relays Renault Laguna (X74), 2001–2007

The second-generation Renault Laguna (chassis code X74; D platform) was produced from 2001 through 2007. During this production run, the vehicle underwent a facelift that updated the radiator grille and improved handling and safety. 

In this article, you will find the locations of all electronic control units (ECUs), as well as fuse and relay box diagrams, descriptions, and photographs for the second-generation Renault Laguna.

General Component Locations

Location of electronic control units (ECUs).

1	ABS and Electronic Stability Program (ESP) ECU
2	Engine management / fuel injection ECU
3	Battery
4	Automatic transmission ECU
5	CD changer
6	Renault key card reader
7	Body Control Module (UCH / central switching unit)
8	Climate control ECU
9	Radio and navigation unit
10	Central display
11	Power window control unit
12	Voice synthesizer ECU
13	Side impact sensor
14	Airbag ECU
15	Instrument cluster
16	Electronic steering column lock ECU
17	Passenger compartment central control module (UCH)
18	Battery discharge warning indicator module
19	Driver’s seat position memory ECU
20	Parking assist ECU

Engine Compartment

The main fuse and relay box in the engine compartment is located adjacent to the battery.

Engine Compartment Fuse Box Diagram
No.	Rating / Description
1	(7.5 A) Automatic transmission
2	Not used
3	(30 A) Engine management
4	(5 A / 15 A) Automatic transmission
5	(30 A) Brake servo vacuum pump relay (F4Rt engine)
6	(10 A) Engine management
7	Not used
8	Not used
9	(20 A) Air conditioning system
10	(20 A / 30 A) Anti-lock braking system (ABS) / Electronic Stability Program (ESP)
11	(20 A / 30 A) Horn(s)
12	Not used
13	(70 A) Auxiliary coolant heaters (if equipped)
14	(70 A) Auxiliary coolant heaters (if equipped)
15	(60 A) Radiator cooling fan motor control
16	(40 A) Headlight washers, heated rear window, multifunction control module
17	(40 A) Anti-lock braking system (ABS) / Electronic Stability Program (ESP)
18	(70 A) Column combination switch, daytime running lights, multifunction control module
19	(70 A) Climate control system, multifunction control module
20	(60 A) Battery current monitoring relay (if equipped), combination switch (if equipped), daytime running lights, multifunction control module
21	(60 A) Power seats, multifunction control module, fuse/relay box, center console, sunroof
22	(80 A) Heated windshield (if equipped)
23	(60 A) Windshield wipers, electronic parking brake
No.	Relays (Option 1)
R1	Auxiliary coolant heater relay
R2	Radiator cooling fan relay (without A/C)
R3	Not used
R4	Not used
R5	Brake servo vacuum pump relay
R6	Fuel pump relay
R7	Diesel fuel heater relay
R8	Fuel shut-off relay
R9	A/C cooling fan low-speed relay
R10	A/C cooling fan relay
R11	Coolant thermoplunger relay 2
No.	Relays (Option 2)
R1	Not used
R2	A/C cooling fan low-speed relay
R3	Not used
R4	Not used
R5	Not used
R6	Fuel pump relay
R7	Fuel vapor heater relay
R8	Fuel pump relay
R9	A/C cooling fan low-speed relay
R10	A/C blower motor relay
R11	Not used

The primary electrical system is protected by a master fuse located on the positive battery terminal cable.

Passenger Compartment

Main Fuse Box

Located on the left end panel of the dashboard. 

The relay board (2) is attached to it. 

General view.

Main Fuse Box Diagram
No.	Description	Rating (A)
1	Main beam headlights	20
2	Body Control Module (UCH) power supply Fuse and relay box power supply Transponder Key card reader Engine start/stop button	10
3	Voice synthesizer Xenon headlight leveling system Instrument cluster Heated washer nozzles	10
4	Reversing lights, climate control system, parking assist, ignition-switched feed (+15) for alarm system, central locking switch illumination, rain sensor, heated windshield	20
5	Interior lighting delay module	15
6	Brake lights, wiper switch, diagnostic connector (OBD), tire pressure monitoring warning light, child safety lock warning light, rear door power lock warning light, power window switch illumination	20
7	Left low beam headlight	15
8	Right side/parking lights	7.5
9	Turn signals and hazard warning lights	15
10	Infotainment system / radio	10
11	Voice synthesizer Instrument cluster Front fog lights Power tailgate lock	30
12	Airbags and seat belt pretensioners	5
13	ABS ECU Electronic Brakeforce Distribution (EBD)	5
14	Horn	15
15	Driver door power window	30
16	Front passenger door power window	30
17	Rear fog lights	10
18	Heated door mirrors	10
19	Right low beam headlight	15
20	Left side/parking lights Dimmable interior lighting and glove box light License plate light	7.5
21	Windshield and rear window wipers	30
22	Central locking system	30
23	Center console auxiliary power socket Hands-free phone system / radiotelephone	15
24	Laguna 2 cigarette lighter fuse Luggage compartment auxiliary power socket	15
25	Electronic steering column lock Heated rear window Front power seats Rear power window lockout switch	10

Relay Box

Diagram.

Standalone Fuse

An isolated 20 A fuse is located under the center console ashtray.
Protected circuits:

• Car radio
• Climate control ECU
• Seat position memory ECU
• Diagnostic connector (OBD)
• Navigation system ECU
• Tire pressure monitoring system (TPMS) ECU
• Multifunction display (clock / exterior temperature / radio)
• Central communication module
• Seat position memory ECU
• Alarm system interface circuits

Auxiliary Fuse Box

An additional fuse box is located on the passenger side behind the glove compartment.

Fuse Box Diagram
No.	Description	Rating (A)
F26	Trailer electrical connector	30
F27	Sunroof	30
F28	Rear left power window	30
F29	Rear right power window	30
F30	Steering angle sensor	5
F31	Not used	-
F32	Not used	-
F33	Not used	-
F34	Driver and passenger seat heating	20
F35	Heated front seats	20
F36	Driver power seat	20
F37	Passenger power seat	20
17	Power window relay
3	Power seat relay
4	Daytime running lights indicator relay
5	Daytime running light (DRL) relay
6	Headlight washer pump relay
7	Brake light cut-off relay