The second-generation Renault Megane was produced from 2002 to 2009 in hatchback, sedan, and station wagon body styles. The sedan was assembled in Turkey, while all other body styles were manufactured in France. In certain markets, the Megane II station wagon was sold under the name Megane Grandtour. This guide details the locations, access procedures, photos, and wiring diagrams for the fuse and relay boxes in the Megane II (chassis codes BM, CM, KM, LM, EM; C platform), including specific identification of the cigarette lighter fuse.
The design of the fuse boxes and the component layout may vary depending on the model year and equipment level. Always verify against the diagram printed on the inside of the protective fuse box cover.
Under the hood
The engine compartment of the Renault Megane II contains three fuse boxes.
Battery fuses
This fuse block is mounted directly on the positive terminal of the battery.
Assignment:
- 30 A – Cabin Electronic Control Unit (UCH/BCM)
- 350 A (gasoline models) / 400 A (diesel models) – Alternator & Engine Compartment Switching Unit (UPC)
- 30 A – Engine Compartment Switching Unit (UPC)
Switching box
Located on the left side of the engine compartment, protected by a cover.
Depending on the version, removing the cover will either provide direct access to replace fuses or reveal a secondary inner housing that requires further disassembly to access the unit.
Accessing the under-hood fuse box
First, remove the battery and unbolt its tray fasteners to gain access to the Engine Control Unit (ECU).
Unbolt the ECU bracket and move it aside. Disconnect the air duct near the radiator and lift the ECU holder.
Unfasten the retaining bolt on the fuse block itself. Slide the unit out, ensuring you disconnect the main wiring harness connectors.
General view (Version 1).
| Engine Compartment Switching Box Fuse Assignment (Version 1) | |
|---|---|
|
|
| No. | Rating / Description |
| 1 | 7.5 A – Left position/parking light, cigarette lighter, central locking and hazard switch, headlight leveling switch, HVAC control unit |
| 2 | 10 A – Left high beam headlight |
| 3 | 10 A – Right high beam headlight |
| 4 | 10 A – Right low beam headlight, front and rear ride height sensors, headlight leveling control, right headlight leveling motor |
| 5 | 10 A – Left low beam headlight, left headlight leveling motor |
| 6 | 20 A – Front fog lights |
| 7 | 7.5 A – Right low beam headlight, right position/parking lights, automatic transmission selector position indicator, power window master module |
| 8 | 15 A – Electronic steering column lock anti-theft mechanism |
| 9 | 5 A – Driver airbag module, Electric Power Steering (EPS) |
| 10 | 7.5 A – Automatic transmission selector position indicator, OBD-II diagnostic socket |
| 11 | 5 A – Electronic steering column lock |
| 12 | 5 A – Automatic transmission control unit (TCU) |
| 13 | 10 A – LPG system control unit |
| 14 | 10 A – Reverse lights |
| 15 | 20 A – LPG solenoid valve relay |
| 16 | 10 A – A/C compressor electromagnetic clutch |
| 17 | 10 A – Reserved / Spare |
| 18 | 40 A – Engine cooling fan motor |
| 19 | 25 A – ABS control unit |
| 20 | 30 A – Heated rear window |
| 21 | 25 A – Starter relay |
| 22 | 25 A – Windshield wiper motor |
| 23 | 25 A – Reserved / Spare |
General view (Version 2).
| Engine Compartment Switching Box Fuse Assignment (Version 2) | |
|---|---|
|
|
| No. | Rating / Description |
| 1 | 10 A – Right position/parking lights (172-226), cruise control switch (1081), ESP switch (1106), automatic transmission selector position indicator (1129), left heated seat switch (1514), right heated seat switch (1513), retractable hardtop switch |
| 2 | 10 A – Left position/parking lights (173-227), cigarette lighter (101), central locking & hazard switch (1391), headlight leveling switch (1390), climate control panel (319), audio head unit (281), multifunction display (653), Body Control Module (UCH) |
| 3 | 10 A – Right low beam headlight (226), rear ride height sensor (1372), front ride height sensor (1373), headlight leveling switch (1360), right headlight leveling motor (538) |
| 4 | 10 A – Left low beam headlight (227), left headlight leveling motor (537) |
| 5 | 20 A – Front fog lights (176-177) |
| 6 | 10 A – Left high beam headlight |
| 7 | 10 A – Right high beam headlight |
| 8 | 25 A – ABS ECU (113) or ESP ECU (1094) |
| 9 | 25 A – Windshield wiper motor |
| 10 | 5 A – Switched ignition power (+15) for Airbags and Electric Power Steering (756-1232) |
| 11 | 15 A – Electronic steering column lock |
| 12 | Unused |
| 13 | Unused |
| 14 | 15 A – Fuel injection system, power protection relay |
| 15 | 10 A – Reserved / Spare |
| 16 | 5 A – Automatic transmission control unit (TCU) |
| 17 | 7.5 A – Switched ignition power (+15) cabin supply: selector lever position indicator (1128), automatic transmission mode switch (129), speed limiter switch (1081), driving school dual controls (459), cabin fuse & relay box (260), auxiliary heater relay 1 (1067), auxiliary heater relay 2 (1088), OBD-II diagnostic socket (225), hands-free microphone |
| 18 | 5 A – Electronic steering column lock |
| 19 | 10 A – Reverse lights |
| 20 | 20 A – Fuel heater relay |
| 21 | 15 A – Windshield/headlight washer pump |
| 22 | 10 A – A/C compressor electromagnetic clutch |
| 23 | 30 A – Heated rear window element |
Power fuse box
Located below the main switching unit.
| Diagram | |
|---|---|
|
|
| No. | Rating / Description |
| 1 | 70 A – Auxiliary heater relay 2 |
| 2 | 60 A – Cabin fuse and relay distribution box / 70 A – Glow plug control unit |
| 3 | 40 A – Auxiliary heater relay 1 |
| 4 | 70 A – Electric Power Steering (EPS) |
| 5 | 50 A – ABS control unit |
| 6 | 70 A – Cabin fuse and relay box (UCH) |
| 7 | 20 A – Diesel fuel filter heater relay |
| 8 | 70 A – Pre-heating / glow plug control unit |
| 9 | 70 A – Auxiliary heater relay 2 |
Auxiliary relays & fuses
Additional components may be installed adjacent to the power fuse box.
|
|
| F9Q engine | |
| A | F9Q: 20 A – Diesel fuel heater |
| B | F9Q814: 20 A – Electric coolant pump |
| 983 | F9Q814: 50 A – Fuel injection control unit power supply relay |
| K9K engine | |
| F1 | Unused |
| F2 | Unused |
| F3 | Unused |
| F4 | 15 A – Main injector relay power supply (+) / Mass Air Flow (MAF) sensor supply protection |
| 234 | K9K724: 40 A – Engine cooling fan relay (460 W, with A/C) |
| 234 | K9K732: 50 A – Engine cooling fan relay (550 W, with A/C) |
| K4M engine | |
| A | 20 A – Fuel pump |
| B | 20 A – LPG fuel pump cut-off |
| C | 20 A – LPG solenoid valve |
| D | 20 A – LPG tank shut-off valve |
| E | 20 A – LPG expansion valve solenoid |
| F | Unused |
In the passenger compartment
The main cabin fuse box is located on the lower left side of the dashboard, behind a removable cover.
The back of the cover features a diagram legend with exact component assignments.
| Cabin Fuse Assignment | |
|---|---|
|
|
| No. | Rating / Description |
| 1 | Unused |
| 2 | Unused |
| 3 | Unused |
| 4 | 3 A – Blower motor & cabin temperature sensor, auto-dimming interior rearview mirror, rain and light sensors |
| 5 | 20 A – Heated front seats |
| 6 | 20 A – Central door locking system |
| 7 | 15 A – Cigarette lighter fuse |
| 8 | 7.5 A – Heated door mirrors |
| 9 | 10 A – ABS control unit |
| 10 | 15 A – Audio head unit, trip computer, headlight washer pump, windshield and tailgate washer pumps (hatchback/wagon), fuel heater (K9K engine), HVAC control unit, alarm system control unit |
| 11 | 15 A – Brake lights |
| 12 | Reserved / Spare |
| 13 | 25 A – Driver's door power window motor |
| 14 | 25 A – Front passenger door power window motor |
| 15 | 20 A – Instrument cluster, power mirrors |
| 16 | 15 A – Horn, OBD-II diagnostic socket, windshield wiper motor |
| 17 | 15 A – Rear window wiper motor |
| 18 | 20 A – Body Control Module (UCH), accessory relay |
| 19 | 30 A – HVAC blower motor |
| 20 | 40 A – Rear power window motors |
| 21 | 20 A / 40 A – Electric sunroof motor / power retractable roof |
| R1 | Power window relay (all doors) |
| R2 | Accessory relay |
Fuse No. 7 (15 A) controls the cigarette lighter circuit on the Renault Megane II.
Additional individual relays may be mounted under the dashboard outside this main unit. For example, Relay No. 1524 (40 A) for the ESP-controlled brake lights is located near the accelerator pedal bracket, while the auxiliary heater relays are located on the left side of the cabin blower assembly.