Replacing the battery Mercedes key

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How to change the battery or repair a fish chip key for Mercedes-Benz cars.
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Sooner or later, owners of the Mercedes-Benz car brand are faced with the fact that the ignition key or ignition lock of their car begins to fail. This is due to some prerequisites:

● When you press the key buttons once, the car does not respond to commands sent from the transmitter. (If the procedure is repeated several times, the key is still initialized)

● There is no reaction to pressing the buttons on the key.

● After inserting the key into the ignition switch, there is no command to allow the engine to start. (If the procedure is repeated several times, the key is still recognized)

● To open the car you need to get as close as possible.

● The electronic steering wheel lock (latch) does not work when the key is initialized in the lock.

The ways to solve these problems in these cases are different:

1) Replacing the battery in the Mercedes ignition key.

Replacing a battery - a Mercedes key battery in Yekaterinburg - is perhaps the simplest operation that can occur when using an electronic key. People call this key “fish” (due to its original shape, similar to a fish).

But still, many car owners have questions about how to do this. By making various mistakes when replacing batteries, the owner takes risks. There is a possibility of damaging the body of the Mercedes key, breaking the entire body, or in the worst case scenario, completely destroying the electronic key. Don't take risks, entrust this work to specialists.

But for those who have decided for themselves, using the example of a new type key (with chrome), we will show how to change the battery in a Mercedes-Benz key.

Chrome fish key and battery (CR2025) Prepare a new battery marked (CR2025). Make sure it works. The voltage must be at least 3V.

Yes, “And so it’s clear,” you say. But many car owners, not having a new battery at hand, want to try to disassemble the key and see how everything works, thereby once again “disturbing” the fragile elements of the cover latches, broken fasteners - the most common reason for contacting our workshop to replace the entire Mercedes-Benz key body , because Items are not sold separately.

Move the lock to the right and pull out the insert. Remove the service insert by moving the lock.

Position the insert as shown in the photo and lightly press on the fixing element of the back cover. Be extremely careful with this action; if you are careless, you can damage the electronic part of the key.

The photo shows all the latches on the back cover of the key.

Remove the old battery and install a new one, first making sure it is working (see step 1).

Reassemble everything in reverse order, then check the key for functionality.

Ready. If the operation is successful, the car will respond normally to the central locking control buttons.

A procedure for repairing a Mercedes ignition key in Yekaterinburg is often required. Not all keys can be repaired.

There are a huge number of reasons for the breakdown, here are some of them:

We washed the Mercedes ignition key in the washing machine, dropped the key, and much more...

To understand the reason for the failure of the key, you need to remove the electronic board, then the technician will examine it for oxide and defects and make a conclusion based on the diagnostics.

Very often, Mercedes keys can be given a second life without overpaying for a new key.

But there are also cases when it is not possible to recover the key. We offer to make a new ignition key for Mercedes in Yekaterinburg and forget about problems with keys for many years.

By following the procedures for making a new key for Mercedes, you can rest assured about your car.

You save more than 60% of your budget when ordering an ignition key for a Mercedes in our workshop and receive a ready-made key in 1 day.

Contacting the dealer takes 2 months of waiting for the key ordered by the VIN number of your car from the manufacturer. At the same time, the price is more than 2 times higher.

Because the work is carried out with certified equipment, the work and components are guaranteed for 6 months, the work is performed in the presence of the client.

3) Mercedes ignition switch repair.

The Mercedes ignition switch is a complex electronic device. Without technical knowledge and operating principles, you should not do repairs yourself. Entrust this complex work to the Ignition Keys workshop.

4) Repair of the lock (latch).

Mercedes in the W204, W207, W212 body are subject to frequent failures of the electronic steering lock, making it impossible to start the car.

We carry out a full range of works related to electronic latch:

You can order the Mercedes w210 ignition key or its repair in our workshop at Nachdiv Onufriev 55 in Yekaterinburg.

Repair of the Mercedes lock, as well as the ignition key for the Mercedes w220 in Yekaterinburg, is carried out at Nachdiv Onufriev 55.

Convert the Mercedes w202 ignition key from a large black fish into a new Mercedes w203 ignition key with chrome.

The ignition key for Mercedes w211, as well as the w212 body, are available.

Mercedes w221 ignition key programming a new key.

Ignition key for Mercedes w251, w215, w164. w208, GLK, CLS, ML, GL.

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How to disassemble a Mercedes key (fish) if you need to repair it or change the case

The convenient chip, which is essentially a Mercedes-Benz key, has a plastic housing. Therefore, despite its functionality and genuine factory quality guaranteed by the manufacturer, the plastic of the key wears out during use. If handled carelessly, exposed to water, dust, or accidental impacts, cracks may appear in the key body, and abrasions and scratches may appear on its surface. The buttons may fall through or have gaps at their edges. In this case, the car owner needs to think about how to disassemble the Mercedes key (fish) in order to replace the old case with a new one. After all, there is often no point in purchasing another key if its hardware works properly and the vehicle responds quickly and correctly to code signals every time. In addition, making a new key will not be cheap.

The key body can be replaced with an original one or a similar one, they are available for sale. An analogue key is cheaper, but it has hard buttons and worse quality throughput of the “eye”. The choice is yours - but if you are going to continue driving your car without planning to sell it, then it is better to purchase a quality part. When purchasing, pay attention to the case model - it can be made in the USA or in Europe (this will be indicated by the red Panic button), as well as which generation of FBS3 the product belongs to.

How to disassemble the key (fish) from a Mercedes? This procedure will require you to perform several steps in sequence:

Prepare wire cutters with narrow jaws and a housing that you will replace the damaged one with.
Take the “fish” and slide the black ribbed latch.
Pull out the mechanical part of the device.
Gently press the gray key button with a suitable metal tool (screwdriver, awl).
Then carefully remove the compartment that holds the batteries. Usually, at home, the edge of the compartment is picked up with a fingernail.
In front of you is a white plastic surface with a latch - you should move it with the tip of an awl or other sharp tool.
The circuit board came into view. Using care to avoid damaging it, pull it out using wire cutters.
You can crack a key body that is too badly damaged if it is difficult to disassemble.
Carefully insert the removed board into the cavity of the new part.
The key is assembled in the reverse order.

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Let's start with option number 2 (short fish)

There are two batteries inside - CR2025.

We move the latch in the direction of the arrow and pull out the iron analog key.

Now, using an iron rod or any thin screwdriver, you need to press the latch inside and hold it.

While holding the latch, pull out the upper part of the key, which will easily separate from it.

We take it out of the case. You can change the batteries and put them back in for future use.

Now (if necessary) to pull out the microcircuit you need to pull or hook the white wide pad with something and pull. It is best done with tongs.

Be careful - the white pad may pop out and fly away.

Option numbered - 3 (chrome fish)

There are two options for chrome keys - with and without a top cover.

In order to open this cover, we take out the iron feather of the key.

We insert the end of the key into the groove in which the lid latch is located. Click on it.

The lid will open itself without effort (bounce off).

Under it we see a battery that needs to be changed. There is only one battery.

If we disassemble this version of the key further - down to the microcircuit, we will get the following details.

In the version without a cover, you need to pull out the insides that contain the batteries.

We take out the iron part.

Next, the iron rod has an end with which you can easily move the latch.

By pressing the latch and simultaneously pulling it out of the case, it will be difficult to move.

Turn it over and see - 2 batteries that can be changed.

Put everything back together and you can use it. Ready.

How to replace the battery in a Mercedes key fob

Starting a Mercedes without a battery in the key

Can't start the engine? But our people are not used to overpaying, since the cost of such a key is from 3 to 5 thousand. However, sometimes technical innovations have the opposite effect.

How to replace the battery in a Mercedes key? Your Mercedes key fob does not respond to your actions?...

Ten simple steps Traffic rules. Just be careful not to drop the battery, as it is small and it will be difficult to find it later.

The most common reason why the key fob does not respond to button presses is a dead battery in the remote control. This was Jobs' calling card.

Video

Battery in Nissan Qashqai keyLink to main publication

There are times when everything gets boring and you start to move. This same situation happened to me. The car has an alarm system, so I don’t use the standard flap.

And when I use it, it doesn’t work very well at a distance of 3 or 5 meters. I decided to replace the battery, since my Japanese friend probably hadn’t changed it since the car was released.

It would have been said! He took the key and started howling.

Full size This is what it looks like completely disassembled

None I guess it took me longer to write this text than to disassemble and assemble the chip key.

Now everything works perfectly and opens and closes from a sufficient distance. But I didn’t notice any difference when starting the car. It started up fine with the old battery and with the new one.

Although when opening the doors, you have to wait for some time for the code to be read. I don’t know what the reason is, CAN YOU TELL ME? !

Workshop replacing the battery in a Mercedes key

Electronics have become so firmly entrenched in our lives that today none of the devices around us can do without them - even ordinary toothbrushes have long become electronic, let alone cars, especially Mercedes, which are rightly considered the flagships in this area and in them. Almost all technical innovations are used.

So you can’t even get into this car without electronics. You press the corresponding button on the key fob, but the car does not react to it at all. Most often, this happens for the most banal reason - the battery in the key fob simply runs out. But replacing it on your own turns out to be not so easy - the manufacturer, as if on purpose, made sure that even for seemingly such a small thing the car owner would contact the service center.

But don’t blame the manufacturers – they know what they’re doing. The key fob, although small, is a very complex electronic device and unqualified replacement of the battery in a Mercedes key can easily damage it. That’s why the most correct decision would be to contact our car service center, where an experienced specialist will carry out this procedure in a matter of minutes. In addition, from us you can always purchase the right battery that will work for the maximum amount of time.

Rules for safe disassembly

Most often, the fish is disassembled in order to replace faulty batteries. It is better to do this without harming the device in a specialized workshop. If you want to try on the role of a rescuer, then here are brief instructions on how to disassemble a Mercedes chip key with your own hands:

press the latch to slide out the key;
press the housing cover;
take new elements (there should be two of them) with a positive electrode;
insert them from above the contact tab, being careful not to put pressure on it;
Replace the cover by pressing it in until the groove is completely in place.

Please note that if the entire procedure takes you more than 60 seconds, you will additionally have to synchronize the key. Therefore, we recommend setting a timer before starting the procedure.

It will not be easy to disassemble a Mercedes chip key yourself without special training and experience. It is better to seek help from professionals - this will save time and money in case of an incorrect procedure.

What is the battery life in the key fob?

Notes in the margins. In fact, the lifespan of any battery, including those that come with car key fobs, is calculated based on the intensity of use of the car and, accordingly, the intensity of use of the key fob. After all, power is supplied to its circuit only at the moment the owner presses one or another of its buttons. However, it would be a mistake to believe that simply lying in a pocket or on a shelf in a closet will not discharge - it is no coincidence that all batteries have their own strictly defined expiration date, which must be indicated on the original packaging. This point must be taken into account when purchasing another battery for the key fob. Otherwise, replacing the batteries in the Mercedes key may not have the desired effect, or this effect will be short-lived and you will have to contact the car service center again very soon.

It should be noted that there is no single standard for car key fobs and, accordingly, keys to them. Moreover: even for cars of the same Mercedes model, but of different years of manufacture, these key fobs can vary greatly - both in shape, and in their internal structure, and in the range of functions they perform. Scientific and technical thought does not stand still, and German car designers have always been at the forefront of it, so the easiest way to determine which battery is installed directly in your key fob is to open it and look at the article number stamped on one of the sides of this key fob. small in size, shiny round “tablet”.

Key fob functions

So, a modern car key fob performs the following functions - it’s not a fact that your key fob has all of them, but most business and executive class cars have them:

activates the vehicle security mode and disables it;
selects the security mode - turns on/off the alarm sound, and also adjusts its volume, turns on/off the feedback function and selects the recipient to whom an alarm signal will be sent in the event of an emergency. That is, via the Internet, the car key fob communicates with both the car itself and the computer of its owner or the security structure with which the owner has concluded a corresponding agreement;
activates impact sensors, and on a number of cars these sensors can be triggered separately - signaling an impact to the front and rear of the car. Moreover, the sensitivity of these sensors is also adjusted from the key fob;
monitors the technical condition of the vehicle, signaling a failure in the operation of its systems and mechanisms;
monitors the air temperature in the cabin, receiving information about this from the corresponding sensors;
controls the operation of the vehicle tilt sensor;
informs the driver about the temperature of the car engine;
searches for a car, and the development of this function today is carried out rapidly. Until recently, it consisted only of the car’s response to pressing the corresponding button on the key fob, but modern key fobs have the ability, in search of, for example, a stolen car, to contact satellites and send information about its current location to the owner’s computer or to a computer server security organization;
turns on/off the locking mode - both for the car, thereby protecting it from unauthorized entry and starting the engine, and its own locking mode, so that while it is in the owner’s pocket, it is protected from accidental key presses.

Thus, modern car key fobs are in operation 24 hours a day, 7 days a week and 12 months a year and at the same time consume significantly more electricity than their less “gluttonous” predecessors. Accordingly, replacing the battery in a modern car key is required more often than just a few years ago. And the choice of battery should be taken more responsibly.

Battery selection

Notes in the margins. Car manufacturers do not manufacture batteries. Moreover: they are not engaged in the manufacture of keychains themselves - this is the prerogative of individual companies specializing specifically in this. So original batteries for Mercedes key fobs do not exist, even theoretically.

When choosing between different batteries, experts recommend giving preference to products from well-known brands (provided, however, that you are sure that the products in front of you are not counterfeit). And, of course, be guided by the technical characteristics of the battery - current strength, voltage, size and capacity. If these parameters do not coincide with the required ones, then you risk damaging the key fob itself, and repairing it and, moreover, purchasing and programming a new one will cost significantly more than simply replacing the battery in a Mercedes key.

We replace the battery for Volkswagen

To carry out the replacement, you need to prepare a new lithium battery, and you will also need a small thin slotted screwdriver. On the side opposite the switches, insert a screwdriver into the place where the housing halves are connected. The lock there is carefully moved towards the metal blade. The case is carefully opened and the plastic locks on both sides are unlocked.

After this, you can remove the battery, but be careful, as there may be two of them. When installing new batteries, you must strictly observe the polarity. Reassemble the housing in the reverse order and if everything is done correctly, the indicator light will be visible.

Repairing the key fob and replacing the battery in the Mercedes key

If replacing the battery in the Mercedes key did not return the key fob to working order, then either you made a mistake in choosing the battery (the specialists of our company do not experience such failures in their work - we have long specialized in servicing cars of this brand and our technicians, including electricians, have extensive experience in their field), or the reason for the malfunction of the electronic key is the key fob itself.

All faults associated with it can be divided into two categories:

mechanical breakdowns when the key fob does not respond to pressing one, several or all keys. The plastic body of the key fob wears out over time and either the buttons begin to jam, or the owner has to press them at different angles in order to achieve the desired result. You can get rid of this problem by replacing the key fob body with a new one;
malfunction of the electronic component of the key fob - failure of the processor, microcircuits or display of the device. Of course, you can try to repair it by replacing the failed element with a new one, but in practice this is not easy - if only because individually, the components of electronic car keys cannot be repaired, and failed ones cannot be restored. Therefore, the only possible way to return the key to functionality is to completely replace the key fob and program it specifically for your car. Only a highly qualified specialist in auto electronics, for example, one of our car service technicians, can perform this task efficiently.

Important: an experienced technician, even when it comes to simply replacing the battery in a car key fob, will always check the device for functionality and, by removing its back cover, clean the device. The fact is that it is the entry of dust and moisture into the key fob that often becomes the cause of its mechanical and electrical breakdowns. To be sure of the tightness of the key fob, when replacing its battery, the technician will not fail to check the integrity of its rubber seals and, if necessary, replace them with new ones.

Being a complex electronic device, the Mercedes key fob requires, like the car itself, careful care. Our specialists are able to restore the functionality of this device in the event of its failure, after which it will again work accurately and for a long time.

Key wear

Ignition keys in Mercedes cars are subject to wear and tear. There are also situations when the driver opened the vehicle door without any problems, but after inserting the fish key into the ignition, he cannot turn it. At the same time, the steering column lock may jam. As experts note, the reason lies in the wear and tear of the key itself and its secret part, that is, the chip. First you need to check the battery voltage. Electronics in a car are very sensitive to voltage, which is why it needs to be constantly monitored to avoid unauthorized changes. If everything is fine with the food, then the reason is the key. The car owner can contact an official dealer, order a new key and receive it in about a month. Typically, keys come from the factory already sewn into the car. But you can do it faster: we order a Mercedes fish key housing using the link, or, if necessary, repair the ignition system.

If you don’t have time to wait for a new key, then you can try to “change the key”. This takes less time (about 2-3 weeks). The key is reprogrammed to recognize the vehicle. But please note that a new chip key does not always fit the car; there are also cases when a “reflashed” fish key cannot be programmed and then dealers offer to replace all the blocks, and this is not a cheap pleasure.