Fuses and relays Renault Megane 2 (phase 1 and phase 2)

Protection of all electronic components of the car from possible overloads and electrical wiring failures is carried out by special devices - fuses. Failure of at least one protective device may lead to a breakdown of the remaining fuses, and, accordingly, a malfunction of any component or electrical equipment of the vehicle. Therefore, if any malfunctions in the operation of the vehicle related to the fuses are detected, the fuses are urgently replaced with new ones.

The operation of the entire vehicle depends on the performance of these protective devices and the electrical circuit. The purpose of fuses is to open the circuit in the event of a sudden increase in current. In other words, they protect electronic equipment from damage in the event of a short circuit or overload.

In such cases, the fuse itself fails (burns out) first, and only then the electrical equipment. A small part takes the first blow, and if it breaks, the replacement will cost very little, unlike a new engine, for example, a window regulator or windshield washer.

Block in the interior of Renault Megane 2

It is located on the lower left side of the dashboard. On the back of the protective cover there will be current information with a decoding of the circuit.

Scheme

Purpose

Fuse number 7 at 15A is responsible for the cigarette lighter.

By all indications, the fuse for the left side dimensions has blown.

But where is he, how to find him?

In the engine compartment there is another relay and fuse box, which bears the proud name “protection and switching unit”.

Of course, I understand the manufacturers of this car. They are so confident in the reliability of all components that they remove fuses in places that simply cannot be reached without a certain skill.

The table shows the circuits that these “hidden fuses” protect.

Fuse protection circuits

Fuse location

And on the way, on the road, anything happens.....

Well, enough lyrics, let's get to work.

Open the hood. To the right of the battery is the box that we need.

We unscrew 2 screws, lift the protective casing up and remove it.

Unscrew these screws and remove the cover

Removing the terminals

Here it is - the protection and communication unit, but in order to pull it out and get to the blown fuse, you have to do a little work.

Remove the terminals from the battery. Be careful! Don't forget to remove the keys from the ignition and store them in the interior. There were cases when, during assembly, you put the terminals on, and the central locking clicked and all the doors were closed. This is how some alarms behave when power is applied. I also removed the indicated wire from the negative terminal; it is short and prevents me from moving the terminal to the side in the future. Remove the battery mounting bracket and take out the battery. It is necessary to remove the connectors from the brake fluid level sensor and the mass air flow sensor. When removed there is more freedom of movement for the tourniquet. Unscrew the engine control unit mounting bracket. We remove the upper connector from the control unit and move the unit along with the bracket to the side. We unscrew 2 more bolts and a nut (it holds the wiring harness), remove the platform for the battery. In front of us is the air filter housing, you can change the filter. (Not a bad idea; to change the air filter, you need to remove the battery, engine control unit, battery platform). Next, we disconnect and move aside the 2 connectors above the block we need. We unscrew the bolt securing the supply of the positive bus to the block. Slightly squeezing the back wall, there is a latch, and pull out the block. It turns out that the fuses that we need are located upside down and in order to change them or simply check them, it was necessary to carry out all the work described above. Having pressed the latches on both sides, remove the protective casing. Here we are! We replace the burnt fuse with a new one and begin the return journey. Collected. We put on the terminals and check. Everything works great. Presumably, the cause of the blown fuse could be a short circuit in the left front side lamp socket. Well, we figured out the “secret” fuses. Let's hope that there are no more secrets for us on the Renault Scenic II, and if they suddenly appear, we will find answers to them too. Below the protection and switching unit there are several more fuses. Their purpose can be found here page 58-60. Until next time. If you are interested in this article and have something to say (good or not) please leave your comments below. I would be very grateful for your participation in the discussion of the article.

How to remove the safety block

If you install an insert that does not match the one required in terms of capacity, the fuse seats may simply burn out. Then you have to replace the safety block with a new one. How it's done?

In principle, the French Megan models of the second and third series are no different in terms of replacing the fuse box. All actions are performed in the following sequence:

• The first step is to lift the hood and disconnect both battery terminals. All work must be done with the power source turned off. If this is not done, the result may be disastrous.
• On the right side of the engine compartment there is a fuse mounting block.
• Remove the battery.

Unscrew the four screws on the battery platform.

In the corner of the platform there is one screw securing the clamp with wires. It is unscrewed and the clamp is completely released.

Using a wrench, unscrew the screw that secures the car's fuse box.

Pull the power supply out a little and disconnect all the connectors with wires.

You get a block like this with security elements.

Now nothing prevents the free replacement of fuses on the block. The procedure for removing old fusible elements onto new ones is carried out using tweezers. After replacing the devices, the power supply unit is assembled and installed by performing the operations in the reverse order.

The Renault Megane III fuse box performs a very important function - it is responsible for the correct operation of the vehicle's electronic system. Therefore, any driver should know the location and purpose of each fuse in order to promptly eliminate malfunctions that arise during vehicle operation.

What should you pay attention to before replacing the starter relay?

The following two tabs change content below.

Without exception, on all Renault models, if such or similar reasons exist, it is necessary to check the functionality of the following circuit:

• First of all, pay attention to the integrity of the wires going to the battery, to the absence of oxides, short circuits and contamination.
  Check the battery and power cables
• Next, check the 25A fuse - F3 under the hood of the car (starter traction relay).
  Fuse box under the hood
• Then, check the condition of the terminal on the starter solenoid relay, which is best reached from below the car, since access to it is not blocked in any way. (If the nut is poorly tightened, a short circuit occurs, and, consequently, the fuse blows).

And only after these manipulations have led nowhere can you pay attention to the solenoid relay itself.

Switching unit Renault Megane 2

This block is located on the left side of the engine compartment and is covered with a protective cover.

Depending on the vehicle configuration, by removing the protective cover you can immediately replace the required fuse. In some configurations you will also need to disassemble some parts:

• remove the battery and unscrew the fasteners from its stand, get to the computer.
• unscrew its fastening and move it to the side. We remove the air duct near the radiator and lift up the ECU holder.
• We unlearn the bolt in the block itself. And now we can extend the block. Don't forget to disconnect the power plugs.

Fuse box diagram under the hood of Renault Megane 2 option 1

Description

Fuse box diagram under the hood of Renault Megane 2 option 2

Description

How to replace a fuse?

The most labor-intensive way to change fuses on a Renault Megane 2 is in the engine compartment block.

For this you will need:

• TORX keys T40, T30;
• regular key for 10 and 13 mm;
• a screwdriver with a flat and thin blade;
• spare fuses;
• removal pliers, they are located under the block cover in the passenger compartment.

To directly access the fuse links, it is necessary to remove a number of elements from the machine.

For example, on a Megane with a station wagon you need to do the following:

1. Disconnect the terminals from the battery and remove it from the car.
2. Behind the battery there is a controller unit with wires. They are secured on top with a plastic casing that must be removed.
3. Remove the plastic battery plate secured with three T40 screws and one regular 10 mm nut.
4. Remove one bolt from the controller body.
5. Disconnect the wire connectors on the controller. To remove them, press the latch with your finger and pull the rotary lever up.
6. Disconnect the wiring harness by carefully disengaging it with the tip of a screwdriver.
7. Remove the battery pad.
8. The fuse box cover will be visible underneath, secured with two T30 screws. You need to unscrew them and remove the cover.
9. Below it are two wiring connectors. To remove the distant one, you need to move the latch up and pull the block with wires to the left. The second small connector has a latch in its design that you need to press and disengage the block.
10. To disconnect the first block, to do this you need to pry and pull out the lock located on the side.
11. Remove the mating part of the second connector block from the block body and unscrew the bolt securing it.
12. Then you need to press the housing latches with the tip of a screwdriver and remove the block. This may require removing the air filter housing. It is better to drag the block from the near corner and slightly press up the plastic casing around the mounting block. This procedure is quite lengthy and requires careful execution.
13. The removed part is the block itself with a box put on it, which serves for tight fixation. You need to release the latches located on the sides and remove this box.
14. Disconnect the connectors of the unit and remove it from the car.
15. After this, you can replace failed elements, for example, dimensions or low beam, in accordance with the diagram.

In addition, if necessary, it is necessary to replace the inserts in a small block of highly loaded circuits. This block is visible in the lower part of the body, which is not removed from the vehicle.

The entire process of replacing a fuse on a Renault Megane 2 is described in detail in a video provided by the Useful China channel.

When replacing fuses, it is necessary to take into account that on Megan of the first and second generations the part is simply pulled up using standard pliers. On the third generation Megane, it first moves to the side and only then is removed.

When searching for a faulty fuse on Megan 3, you must carefully study the diagram. For example, each car brake light receives power via a separate circuit and has a separate fuse in the interior unit.

Access to electrical equipment on such machines is easier.

In order to dismantle the block you must:

1. Unfasten the four latches at the corners.
2. Remove the two red fasteners.
3. Remove the wiring plug.
4. Remove the unit and replace the necessary parts.

How to replace the block?

Blocks may need to be replaced if the seats burn out or become damaged. Such cases occur when using fuses of the wrong rating. Replacing the block in the engine compartment is carried out according to a scheme similar to replacing fuses. In the new unit it is necessary to install the fuses in the same places as in the old one. It is important to check that the rating of the inserts matches the requirements of the electrical circuit for the car's fuses. Replacing the unit on Megan 3 is much more difficult, since the car has a more complex electrical circuit, so it is better to entrust the work of changing the device on this version of the car to professionals.

Types of lamps, their quantity, types and power

Renault Megane 3 has two H7 lighting fixtures in the high and low beam headlights with a power of 55 W. The front marker light and side turn indicators have 2 W5W 5 W each.

The daytime running light contains 2 P21W with a power of 21 W. The front and rear turn signals each have 2 PY21W with a power of 21 W. Fog - 2 H11 55 W. And the side light/brake light has 2 lamps of types 5W and P21 with a power of 5 W and 21 W, respectively.

The rear fog lights, reversing light, license plate light and additional brake light have a P21W 21 W lighting element.

Electrical design of Renault Megane 2

Engine control diagram F4R Renault Megane 2 (Link to photo source) Click to enlarge
The electrical diagram of Renault Megane II is mounted on a single-wire system. This means that the negative terminal of the sources and receivers of electricity is directly connected to the car body (ground). It serves as the remaining part of the conductor. The power circuits of the control program of the power unit are mounted according to a multi-wire circuit. The connection to ground is made through the computer. Plus is supplied to the contacts of Renault Megane 2 equipment through fuses and relays from the battery and generator. The battery carries the load when the engine is turned off, and the generator when the engine is running.

Switching of the main circuits of the machine is provided through a special reading device.

Reader (Link to photo source)

Data transfer between Renault Megane 2 node devices is carried out using multiplex CAN buses (ConTROller Area Network) at speeds of up to one Mbit/s. It consists of a twisted pair of conductors that connect the ECU. A gateway is used to interface individual CAN buses. The use of CAN buses helps reduce the total number of conductors in the car.

If a fault is detected in the diagnostic CAN bus, information in the form of a specific malfunction code is recorded in the memory of the ECUs that are connected to the bus. To read codes using scanners, there are two diagnostic connectors connected to the CAN bus. One connector for connecting diagnostic equipment is mounted in the interior space, and the second is in the engine compartment of the Renault Megane II.

Diagnostic connector in the interior of Renault Megane 2

Warnings

Before carrying out any work on the electrical circuits of the Renault Megane II, you must disconnect the battery. Operations to disconnect or connect the battery are carried out with the ignition turned off. If the battery is disconnected while the power unit is running, there is a high probability of damage to the voltage regulator or electronic devices of the 2nd generation Renault Megane.

It is prohibited to check the functionality of the power circuits by shorting the negative wire to the body. This is fraught with failure of electrical appliances. You cannot use fuses of a different design, designed for higher current, as well as jumpers instead of fuse links.

Operations for changing Renault Megane 2 fuses must be carried out without screwdrivers to prevent short circuits.

If you plan to carry out electric welding work, you will need to disconnect the output not only from the battery, but also from the generator and controller. When charging the battery, you should disconnect the power wires from the Megan 2 battery.

Periodically it is necessary to clean oxide and dirt from the terminals and tips of the battery wires.

Diagnosis by symptoms

It is impossible to clearly say what kind of resource a Renault Megane 2 starter has. It can last 70-80 thousand km, and sometimes it runs smoothly for 200,000 km. For example, short runs, when you have to frequently turn off and start the engine, or careless handling can greatly reduce the service life.

The following symptoms will indicate that the Renault Megane 2 starter needs to be replaced:

• The starter works, but the engine does not turn over. The planetary gear or bendix may be broken.

(Link to photo source) Eaten Bendix teeth

• The device clicks. There are several reasons: bad ground, dead Megane 2 battery, broken armature or retractor relay, worn brushes.

Wear of starter brushes (Link to photo source)

• When starting the engine, a grinding noise is heard - wear of the freewheel or bendix shaft bushing or scuffing on the contact part of the flywheel.
• The starter turns slowly with excessive force - there is a short circuit in the armature winding, stator winding or in the brush assembly, the Megane 2 rotor bushing is worn out.

Burnt starter winding Megane

• Starting a cold Renault Megane 2 engine does not cause problems, but when it is hot, clicks are heard - the mass suitable for the brush assembly has disappeared, the plates have worn out and are in poor contact, the springs of the brush assembly have weakened, the solenoid relay or the bushings are worn out.
• In some cases, cleaning the contacts or recharging the battery will help. If this does not help, you will have to dismantle and disassemble the Megane 2 starter to find and fix the problem.

Layout diagram under the hood in the engine compartment and in the cabin, description

All electrical circuits of a Renault car are protected in the form of fuse links of various ratings. In the event of a sudden failure of headlights or other components of the electrical system, in order to understand the problem and fix it, the driver should first check the functionality of the fuses on Renault Megane 1, 2 and 3.

Where is the power supply and its circuit

All generations of Renault Megane use electrical wiring with two separate fuse blocks. One of them is located at the bottom of the instrument panel near the knee of the driver’s left leg. The second is installed in the engine compartment.

Salon block

The location of the interior unit fuses on Megan 1, 2 and 3 cars may differ.

Block under the hood

Depending on the generation of the car model, the blocks in the engine compartment are located in different places.

How to replace a fuse?

The most labor-intensive way to change fuses on a Renault Megane 2 is in the engine compartment block.

For this you will need:

• TORX keys T40, T30;
• regular key for 10 and 13 mm;
• a screwdriver with a flat and thin blade;
• spare fuses;
• removal pliers, they are located under the block cover in the passenger compartment.

To directly access the fuse links, it is necessary to remove a number of elements from the machine.

For example, on a Megane with a station wagon you need to do the following:

1. Disconnect the terminals from the battery and remove it from the car.
2. Behind the battery there is a controller unit with wires. They are secured on top with a plastic casing that must be removed.
3. Remove the plastic battery plate secured with three T40 screws and one regular 10 mm nut.
4. Remove one bolt from the controller body.
5. Disconnect the wire connectors on the controller. To remove them, press the latch with your finger and pull the rotary lever up.
6. Disconnect the wiring harness by carefully disengaging it with the tip of a screwdriver.
7. Remove the battery pad.
8. The fuse box cover will be visible underneath, secured with two T30 screws. You need to unscrew them and remove the cover.
9. Below it are two wiring connectors. To remove the distant one, you need to move the latch up and pull the block with wires to the left. The second small connector has a latch in its design that you need to press and disengage the block.
10. To disconnect the first block, to do this you need to pry and pull out the lock located on the side.
11. Remove the mating part of the second connector block from the block body and unscrew the bolt securing it.
12. Then you need to press the housing latches with the tip of a screwdriver and remove the block. This may require removing the air filter housing. It is better to drag the block from the near corner and slightly press up the plastic casing around the mounting block. This procedure is quite lengthy and requires careful execution.
13. The removed part is the block itself with a box put on it, which serves for tight fixation. You need to release the latches located on the sides and remove this box.
14. Disconnect the connectors of the unit and remove it from the car.
15. After this, you can replace failed elements, for example, dimensions or low beam, in accordance with the diagram.

In addition, if necessary, it is necessary to replace the inserts in a small block of highly loaded circuits. This block is visible in the lower part of the body, which is not removed from the vehicle.

The entire process of replacing a fuse on a Renault Megane 2 is described in detail in a video provided by the Useful China channel.

When replacing fuses, it is necessary to take into account that on Megan of the first and second generations the part is simply pulled up using standard pliers. On the third generation Megane, it first moves to the side and only then is removed.

When searching for a faulty fuse on Megan 3, you must carefully study the diagram. For example, each car brake light receives power via a separate circuit and has a separate fuse in the interior unit.

Access to electrical equipment on such machines is easier.

In order to dismantle the block you must:

1. Unfasten the four latches at the corners.
2. Remove the two red fasteners.
3. Remove the wiring plug.
4. Remove the unit and replace the necessary parts.

How to replace the block?

Blocks may need to be replaced if the seats burn out or become damaged. Such cases occur when using fuses of the wrong rating. Replacing the block in the engine compartment is carried out according to a scheme similar to replacing fuses. In the new unit it is necessary to install the fuses in the same places as in the old one. It is important to check that the rating of the inserts matches the requirements of the electrical circuit for the car's fuses. Replacing the unit on Megan 3 is much more difficult, since the car has a more complex electrical circuit, so it is better to entrust the work of changing the device on this version of the car to professionals.

Location

The Renault Megane 2 model has two fuse mounting blocks:

The main one (cabin) is located inside the car in the lower left part of the dashboard in the driver’s seat. To access the devices, simply remove the cover, first disconnecting the latches.

Figuring out which fuses are responsible for which electrical equipment is quite easy. To do this, you need to carefully study the diagram on the block cover. In Renault Megane 2, protective elements that ensure safety often fly out:

• heating system;
• air conditioning;
• stoves;
• radios;
• cigarette lighter.

The first three positions are represented by fuse number 30, and the circuit itself is marked SP3.

Most of the equipment is responsible for the fuse designated BCP3 with cell number 25. Nearby is BP77 (cell 20), which completely protects all electrical devices in the car interior. The purpose of each element is detailed in the table.

To replace a failed fuse, knowing the layout of the devices, just carefully use non-metallic tweezers (included under the unit cover) to remove the faulty device and insert a new one. By the way, spare devices must be attached to the back of the cover by the manufacturer.

The second block is located in the engine compartment of the car closer to the shock absorber strut. It is in it that protective devices for low beam and other optical equipment are installed.

Replacement of non-working elements

Almost all supply lines for Renault electrical appliances. The most powerful consumers of electricity are connected via relays. Fuses and relays are located in two mounting blocks located in the passenger compartment and in the engine compartment. The mounting block under the hood is located on the left side along the direction of the car. This block contains the air conditioning relay, which is also the electromagnetic clutch of the air conditioning compressor, which is designed for a current of 10A.

Replacing this clutch with Megan 2 can be divided into the following stages:

• Unscrew the screws of the mounting block cover;
• separate the cover of the mounting block;
• remove the battery;
• remove the bolt securing the switching unit and move it to the side for easy replacement;
• according to the drawing on the back of the cover, you need to select the required compressor clutch and pull it out by hand;
• insert a new coupling and return the block to its place, then install the battery back and close the mounting block with the lid.

During the use of the Megan 2 car, the performance of the air conditioning elements decreases, both due to mechanical damage and wear and tear of the equipment. So, over the course of a year, the volume of coolant in the system can decrease by 10% -15%. In view of this, it is necessary to periodically check the operation of system components and replace the cabin air filter.

Don’t forget about cleaning the condenser and evaporator. Some automakers recommend turning on the system for a short time, even at low temperatures, so that parts and lines are automatically lubricated.

Diagnostics

To finally make sure that the starter removed from the Renault Megane 2 is faulty and identify the cause of the breakdown, carry out a series of checks:

• Using a screwdriver, try to slide the freewheel along the shaft. It should move without effort.
• Inspect the drive gear. Make sure that the part rotates freely around the hub coupling in the same direction as the Megane 2 anchor element. The gear should not rotate in the opposite direction.

(Link to photo source)

• Now check the serviceability of the traction relay. Take the wires with which you usually “light” the battery. One wire connects the negative terminal on the battery and the starter housing removed from the Megane 2. The second wire connects the positive terminal and the connector into which the wire that controls the traction relay is inserted. Once connected, you should hear a click and the coupling will come out. If nothing happens, the mechanism is faulty.
• Leave the negative wire there, and reconnect the positive wire to the contact bolt. If everything is in order, the anchor will begin to rotate quickly. If there is no rotation, it needs to be repaired.

Sources:

https://peretyajka-salona.ru/renault/gde-nahoditsya-rele-startera-na-reno-megan-2.html https://kosmos-bonus.ru/gde-nahoditsja-rele-startera-na-reno -megan-2/ https://carenault.ru/megane/megane-2/snyatie-diagnostika-i-remont-startera-megan-2/

Fuse blocks in the engine compartment

Fuse box location

Fuse block diagram No. 1

Assignment of fuses in fuse box No. 1 in the engine compartment.

No.Description

Fuse block diagram No. 2

This block is located in the motor connection block, under the protection and switching block.

Assignment of fuses in fuse box No. 2 in the engine compartment.

No.Description

Fuse/relay box in the engine connection block, under the protection and switching unit

Fuse/relay box in the engine connection block, under the protection and switching unit

No.Description

Transmission

Automatic transmission, Automatic transmission radiator, Valve block, Torque converter, Automatic transmission sensor, Decorative trim, Automatic transmission housing, Automatic transmission bracket, Mechatronics DSG, Automatic transmission pan, Automatic transmission gasket, Automatic transmission cushion, Automatic transmission handle, Automatic transmission oil seal, Automatic transmission solenoid, Automatic transmission thermostat, Brake Automatic transmission tape, Automatic transmission cable, Automatic transmission dipstick, Manual transmission, Oil cooler, Secondary shaft, Manual transmission sensor, Manual transmission housing, Manual transmission bracket (mount), Rocker, Input shaft, Manual transmission cushion, Secondary shaft bearing, Primary bearing shaft, Speedometer drive, Manual transmission gasket, Intermediate bearing, Manual transmission handle, Shift lever, Shaft seal, Manual transmission seal, Synchronizer, Manual transmission cable, Transmission gear, CVT variator, CVT belt

Fuses and relays Renault Megane 2 (phase 1 and phase 2)

Like all cars, Renault Megane 2 is no exception in terms of circuit protection and power signal management. For these purposes, the car has relay and fuse blocks. One in the cabin, three in the engine compartment: one on the battery terminals, the second on the casing in the fuse box, the third on a retractable slide. It is about these blocks and installation locations, and even more precisely about the location of the fuses, their ratings and functionality that you will be told in this article. Information will be provided for Renault Megane 2 sedan, hatchback, station wagon 2003, 2004, 2005, 2006, 2007, 2008 models with gasoline (K4J, K4M, F4R) and diesel (F4R) engines.

Where is the fuse and relay box located in the Renault Megane 2 interior?

The interior fuse box is located in the instrument panel at the bottom left. For clarity, take a look at the photo; you can clearly see where this block is located. This block is easy to reach and it is easy to check the integrity of the fuses in it.

The block itself looks like this...

...and the fuse designations and ratings are as follows.

Now we can talk about blocks and places in the engine compartment. Let's start with what is simpler.

Where is the fuse and relay box located in the engine compartment of Renault Megane 2

The first fuses can be found directly on the battery labels. There are only 3 things.

Fuses and relays in the interior of Renault Megane 2

The mounting block in the cabin is located at the bottom of the control panel on the driver's side. There is a block diagram on the inside.

Sources

• https://logan-50.ru/inomarki/predohraniteli-i-rele-renault-megane-2-faza-1-i-faza-2.html
• https://AvtoKart.ru/diagnostika-i-remont/reno-megan-2-predohraniteli-pod-kapotom.html
• https://gyroscooter-izhevsk.ru/pro-salon-i-kuzov/predohraniteli-reno-megan-2.html
• https://avtoblokrele.com/blok-predohranitelej-i-rele-renault-megane-2/
• https://autodvig.com/diagnostics/predohraniteli-reno-megan-42057/
• https://carenault.ru/megane/megane-2/izuchaem-predohraniteli-reno-megan-2/
• https://KrymShina.ru/korobka-peredach/predohranitel-zadnego-hoda-megan-2.html
• https://fuse-box.ru/predohraniteli-i-rele-renault-megane-ii-2003-2009/
• https://autonissancar.ru/renault/megane/megane-2/izuchaem-predohraniteli-reno-megan-2

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