Table of Contents
The third-generation Renault Laguna (chassis code X91: BT, KT, DT; D platform) was produced from 2007 to 2016. A station wagon version, marketed as the Estate, was launched alongside the hatchback.
This manual provides detailed information on all electronic control units, fuses, and relays for the Laguna 3, including component layout diagrams and fuse assignment tables. Special emphasis is given to the fuses servicing the cigarette lighter and auxiliary power sockets.
General Component Layout
Locations of electrical components.
|
|
| No. | Component |
| 1 | ABS control module |
| 2 | Climate control module – behind glove box |
| 3 | A/C / heater blower motor control module |
| 4 | Battery |
| 5 | CAN bus gateway control module |
| 6 | Diagnostic Link Connector (DLC) |
| 7 | Driver door control module |
| 8 | Front passenger door control module |
| 9 | Electronic parking brake (EPB) control module – underbody |
| 10 | Engine Control Module (ECM) |
| 11 | Engine coolant preheater control module |
| 12 | 4-Wheel Steering (4Control) control module – underbody |
| 13 | Engine compartment fuse box 1 |
| 14 | Engine compartment fuse box 2 |
| 15 | Engine compartment fuse box 3 – under-hood power distribution: Alternator, engine fuse/relay box 1, engine fuse/relay box 2, instrument panel fuse/relay box 1, Body Control Module 2, power steering pump, starter motor. |
| 16 | Passenger compartment fuse box 1 |
| 17 | Passenger compartment fuse box 2 – auxiliary heater model |
| 18 | Xenon headlight control module |
| 19 | Glow plug relay |
| 20 | Horn |
| 21 | |
| 22 | Body Control Module 1 (UCH) – Functions: Central locking, alarm, heated rear window, horn, immobilizer, turn signals, interior lighting, keyless entry/start, fog lights, rear window wiper/washer, steering column lock, brake lights, tailgate release, windshield washer |
| 23 | Body Control Module 2 (Protection and Switching Unit / UPC) – Integrated into engine fuse/relay box 1. Functions: Air conditioning, radiator cooling fan, oil level sensor, fog lights, fuel pump, headlights, headlight washers, reverse lights, front position lights, rear position lights, windshield wipers |
| 24 | Navigation control module |
| 25 | Park Assist control module – behind right rear trim panel |
| 26 | Power steering control module |
| 27 | Power seat control module |
| 28 | Heated seat control module 1 – under seat |
| 29 | Heated seat control module 2 – under seat |
| 30 | Heated seat module – under seat |
| 31 | Supplemental Restraint System (SRS/Airbag) control module |
| 32 | Transmission Control Module (TCM) |
Passenger Compartment Fuse Box
Located on the lower left side of the dashboard.
| Diagram | |
|---|---|
|
|
| No. | Rating / Description |
| R1 | Time-delay power supply relay for fuses F39, F40, F41, F42, F43, F44, F49, F50, F51, F52 |
| R2 | Heated rear window relay |
| R3 | Horn relay |
| R4 | Unused |
| R5 | Unused |
| R6 | Unused |
| R7 | Unused |
| R8 | Unused |
| R9 | Time-delay power supply relay for fuses F45, F46, F47, F48, F53, F54, F55, F56, F57, F58 |
| R10 | Unused |
| F1 | Empty |
| F2 | Empty |
| F3 | Empty |
| F4 | Empty |
| F5 | (5 A) Interior lighting |
| F6 | (5 A) Electrochromic rearview mirror |
| F7 | Empty |
| F8 | Empty |
| F9 | Empty |
| F10 | Empty |
| F11 | Empty |
| F12 | (40 A) Heated rear window |
| F13 | Empty |
| F14 | Empty |
| F15 | Empty |
| F16 | Empty |
| F17 | Empty |
| F18 | (20 A) Body Control Module (UCH) |
| F19 | (20 A) Body Control Module (UCH) |
| F20 | (10 A) Body Control Module (UCH) |
| F21 | (15 A) Alarm system ECU, display |
| F22 | (15 A) Body Control Module (UCH) |
| F23 | (30 A) Front passenger door control module |
| F24 | (30 A) Driver door control module |
| F25 | (25 A) Heated seats |
| F26 | (15 A) Body Control Module (UCH) |
| F27 | Empty |
| F28 | (30 A) Sunroof / Moonroof |
| F29 | (25 A) Electronic parking brake |
| F30 | (20 A) Trailer wiring harness / socket |
| F31 | (10 A) Body Control Module (UCH) |
| F32 | Empty |
| F33 | (25 A) Audio system |
| F34 | Empty |
| F35 | Empty |
| F36 | (20 A) Audio system, multi-function display |
| F37 | (10 A) Instrument cluster |
| F38 | Empty |
| F39 | Empty |
| F40 | (5 A) Brake light switch, ABS/ESP control modules |
| F41 | Empty |
| F42 | (25 A) Power seats |
| F43 | |
| F44 | (15 A) Luggage compartment 12 V power socket |
| F45 | Empty |
| F46 | Empty |
| F47 | Empty |
| F48 | (10 A) Second-row 12 V accessory socket |
| F49 | (5 A) Climate control module (A/C ECU) |
| F50 | (30 A) Power windows |
| F51 | (5 A) Interior courtesy lighting |
| F52 | (5 A) Audio system, central locking, hazard warning lights |
| F53 | Empty |
| F54 | (10 A) Cigarette lighter fuse |
| F55 | (5 A) Interior temperature sensor fan |
| F56 | (15 A) Heated windshield washer jet (left) |
| F57 | Empty |
| F58 | (40 A) Climate control module (A/C ECU) |
Luggage Compartment Power Distribution Box
The power distribution box is located adjacent to the battery and contains high-current fusible links.
|
||
| No. | Description | Amps |
| F1 | Starter motor | |
| F2 | Battery disconnect unit | 250 |
| F3 | Passenger compartment fuse and relay box | 60 |
Engine Compartment Fuse Boxes
Three power distribution boxes are located on the right side of the engine compartment.
Fuse Box 1
General layout.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| D1 | Spare diode | - |
| D2 | Spare diode | - |
| D3 | Radiator cooling fan diode | 49 |
| D4 | Spare diode | - |
| FM1 | Radiator cooling fan, Protection and Switching Unit (UPC) | 60 |
| FM2 | Unused | - |
| FM3 | Unused | - |
| FM4 | Unused | - |
| FM5 | Glow plug preheating module | 70 |
| FM6 | Engine coolant heater module | 70 |
| FM7 | 70 | |
| FM8 | Fuel injection ECU, fuel heater relay, cooling fan series/parallel relays | 20 |
| FM9 | Unused | - |
| FM10 | Unused | - |
| FM11 | Unused | - |
| FM12 | Unused | - |
| FM13 | Unused | - |
| FH1 | Passenger compartment fuse box | 80 |
| FH2 | Passenger compartment fuse box – Protection and Switching Unit (UPC) | 80 |
| FH3 | ABS/ESP control module | 40 |
| FH4 | Passenger compartment fuse box | 80 |
| FH5 | Climate control ECU | 60 |
| FH6 | 4-Wheel Steering (4Control) ECU | 60 |
| FH7 | Climate control ECU | 30 |
| FH8 | Unused | - |
Fuse Box 2
General layout.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| F1 | Right headlight, automatic headlight leveling | 10 |
| F2 | Left headlight, power window switch, tailgate release | 10 |
| F3 | Headlight washers | 15 |
| F4 | Front fog lights | 20 |
| F5 | Left headlight | 10 |
| F6 | Right headlight | 10 |
| F7 | Diagnostic Link Connector (DLC), passenger compartment fuse box, gear selector display | 15 |
| F8 | ABS/ESP system | 30 |
| F9 | Windshield wipers | 30 |
| F10 | Airbag/seatbelt pretensioner ECU, steering column switches | 10 |
| F11 | Empty | - |
| F12 | Transmission Control Module (TCM) | 7.5 |
| F13 | Empty | - |
| F14 | Front and rear oxygen sensors, diesel fuel sensor | 15 |
| F15 | Transmission Control Module (TCM) | 20 |
| F16 | Brake light switch, fuel heater relay | 5 |
| F17 | Reverse light relay, manual transmission neutral position sensor | 10 |
| F18 | Body Control Module (UCH) | 15 |
| F19 | Starter motor | 25 |
| F20 | Empty | - |
| F21 | Empty | - |
| F22 | Air conditioning compressor clutch | 10 |
| F23 | Fuel injection ECU | 5 |
| F24 | Left headlight | 15 |
| F25 | Right headlight | 15 |
Main Power Fuse Panel
Located directly on the battery.
| Diagram | ||
|---|---|---|
|
||
| No. | Description | Amps |
| F1 | Empty | - |
| F2 | Empty | - |
| F3 | Battery positive (+) supply to passenger compartment fuse/relay box and Protection and Switching Unit (UPC) | 80 |
| F4 | Alternator power supply, engine compartment fuse/relay box | 300 |
| F5 | Empty | - |
| F6 | Battery positive (+) supply to fuel injectors, fuel pump via Protection and Switching Unit (UPC), fuel injection ECU, and turbocharger coolant pump | 35 |
| F7 | Protection and Switching Unit (UPC) main power supply | 5 |