keyignition › Blog › Replacing the battery in a Mercedes key without damage.
How to change the battery or repair a fish chip key for Mercedes-Benz cars.
Information provided by Our website: ignition keys.rf
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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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.
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.
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Depending on the type of remote control used, the required number of batteries varies. So the first key Type 1 - the triangular panic button uses only one CR battery The second key Type 2 - the round panic button has two CR batteries The third key fob Type 3 also has two CR batteries The fourth key, on which it is also easy to replace the battery yourself, also has two CR batteries.
We repair the key ourselves
The weak point in the fish key is the microswitch. The car may not respond to the key because dirt has accumulated under the IR key fob button. You can remove it yourself. To do this, disassemble the key, remove the batteries and circuit board. Wash all elastic bands, external buttons and the body itself with water and dry. In this case, the board must be de-energized. Next, pay attention to the button soldered into the board. It is collapsible: inside it has a push button, outside there is a U-shaped bar. We take a sharp object, carefully press the bar away from the body, and remove the pusher. Under it there is a brass membrane - we also remove it with a needle. It is under this membrane that dirt constantly accumulates, which closes the contacts.
The internal parts of the key fob must be washed with alcohol, wait until they dry and put back together. If this method does not help to “revive” the key, then we recommend ordering a new one.
Topic closed. If you still need help, make an appointment with our car service center for diagnostics and repair of a Mercedes by phone,.
Ask your question in a separate topic
First press the button to push out the metal part of the key. Turn the key with the buttons down and move the top half to the side. It will take some effort to move.
Most likely you need to do the following: pull out the metal key and carefully look at what’s inside. There should be a button that you need to press with something thin, after which you need to carefully pull out the top part.
Thanks for the answer. But here the matter is different. I opened the battery compartment and the board is visible there. I just don’t understand how to remove the board. The case appears to be sealed. If anyone has opened it completely, please tell me.
Should I remove the metal key completely? In the sense of separating it from the body? It’s also unclear how.
The microcircuit is not secured by anything, it just lies in the socket; you need to pick it up with something sharp and carefully remove it.
Let me clarify, we are talking about an infrared chip-key-discard. In the hole for installing batteries, a part of the board is visible, the dimensions of which exceed the diameter of the hole. So it is impossible to remove the board through the battery hole. On this site, in the Articles section, the sixth position is the article “Solving problems with a Mercedes chip key.” Could the author of the article tell me how to “disassemble the key fob, remove the board” in my case. Auto W202
Voobscem beresh otvertku shlicevuju i so storoni gde knopka vikidushki pod lkjugc zasovivaesh otvertocku i okuratnenjko nacenaesh razlamivatj on ne zapajan ocen xoroshoshie zascelki toka na etoi nedeli sam cenil kljucj sam avtoelektrik problema bila s mik rikom
Thanks for the good advice. After fiddling around, I used two screwdrivers to separate the case. Reason for refusal: the microphone came off. Soldered, synchronized and everything works. Thank you all for your assistance. Especially korstrik.
Maybe I don’t understand something about disassembling the key, but I can’t get the board out of mine. The key itself does not break; it has no fasteners. I pulled out the key by pressing the button and also pressed the latch and pulled out the canoe with batteries inside the board that refuses to come out, what should I do? I really need a second key. Mercy W203 c200kompressor December 2002.
Merlin, your key is a “fish”, it cannot be repaired, here we were talking about a “miscarriage”. You will have to order the second key from dealers.
Are you going to say that things are bad with him? or rather a complete scribe? Well, the light comes on a little when you press the button. does that mean he's not completely dead HELP?? Well, I really don’t want to pay 10,000 thousand for a key
Merlin, what's the problem? Maybe the key needs to be synchronized?
it doesn't make any noise when you put it in the ignition, and when you press the buttons the light doesn't light up brightly, but they ate the magnet and nothing happens
I have the same fish key. The question is about replacing the housing. There are only three keys, two of them work but the housings are so-so, and there is an additional key from nowhere) it has a completely new housing, but the car does not respond to it. I take the key apart and see the circuit board. THE QUESTION IS CAN YOU JUST TAKE OUT THE BOARD AND INSERT IT INTO ANOTHER CASE.
Explain what a fish key is and how the key can be synchronized? Well, a new key costs 10,000.
The fish key is so called because of its shape. The synchronization process is described on our website, in the “Articles” section: https://www.mercedes-service.ru/articles/w124-c202-w140-e210-ml-chipkey.html True.
the fish cost 14,000, 1,500 for the iron part and 12,500 for the fish itself, I’ll go to Surgut on Saturday to pick it up, it seems like even in the new building, I’ll write back when I get it
Please tell me, I took apart the miscarriage key, but I can’t put it back together. There, as soon as the case opened, everything immediately flew out and now I don’t know where it came from! Thank you in advance!
At least somehow describe what parts you have. There are a lot of manuals on the Internet for W202, there are pictures of the keys.
I understood how to insert the key, I didn’t understand where to put some kind of plastic - under or above the board?
Please, if it’s not too difficult, send me a link to a disassembled miscarriage key, I can’t put it together!
My MB key is glitched. I insert the key into the lock and it does not turn, while the central locking works - but the steering wheel does not close - I took it to the dealer in St. Petersburg, the next day they called me and said that everything in the lock needed to be changed ((((( total amount only for spare parts 78,000 rub + work "The toad crushed" "I decided to pick it up and took it to one "KULIBIN" a day later "KULIBIN" called me and said that everything was fine, you can pick up the car - all the work will cost 3,000 rubles - I spent a long time asking what was the matter and he showed me what the problem was!! in the lock circuit there is a “pre” which burns out and that’s it - the lock doesn’t see the key but the central locking works - the MB dealer found the problem and pulled out the “pre” (the pre cell was empty) and told me that you need to buy a new lock in the amount of 78,000 SO IN THE POWER SYSTEM OF THE ELECTRIC KEY THERE IS A “PROD” FOR 15 AMPERES WHICH BURNES AND THE WHOLE PROBLEM!!
I'll disappoint you, but fuses don't blow so easily.
I decided to disassemble the non-working duplicate key and clean it of leaking batteries!
1) you need: scalpel, slotted screwdriver 2 pcs., hair dryer! 2) we take out the batteries from the key fob 3) the first impression is that the key fob is not removable and the seam is decoration, it’s not like that, there’s a grooved connection, i.e. one half is dad, the other is mom 4) use a hairdryer to warm up the keychain, but not too much so as not to overheat 5) with a scalpel, we slowly begin to peel off the outer side of mom from dad, periodically using a hairdryer 6) after this has been done, use slotted screwdrivers to pick out the upper half and slowly begin to peel along the perimeter keychain 7) keychain with a turd but it gives in (unfortunately, even if you poke around for a very long time you cannot do without injury “The main thing is not to break the axial bushing of the Sting fastening!)
8) and so the keychain is disassembled! clean with alcohol, wipe, remove burrs, etc. (whoever fumbles with electronics can get in there with a metal iron)
9)Both worked. Let's assemble - there shouldn't be any difficulties if you haven't lost the spring and other parts!
All these manipulations can be done without a hairdryer, but then the number of injuries will be much greater!
It is not worth expecting that the keychain field of such vandalism will look like new, this operation leaves its mark!!
where is this 15 amp fuse located? I have the same problem, I insert the key, but I can’t turn it (((
The fuse is located in the block under the hood, on the driver's side, in the same place as all the fuses, I can't say the exact number, but in my car it is number 26 or 28, I found it at random at one time
Thanks to technological progress, many everyday things are becoming more and more convenient. However, sometimes technical innovations have the opposite effect. For example, in cases where your Mercedes electronic key stops working due to the fact that its batteries are dead. But there is no need to panic, this problem can be easily and quickly solved on your own. If you don't know how to change the battery in a Mercedes key, this article is for you. The only thing you need is a couple of CR-2025 coin-cell batteries and a little sleight of hand.
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.
How to tie a fish key
Moderator: Gonza
How to tie a fish key
Post by Mihal » 06/13/2012 15:19
Re: How to tie a fish key
Message 6A3AP » 06/13/2012 16:21
Re: How to tie a fish key
Message by alex-37 » 06/14/2012 11:38
Re: How to tie a fish key
Post by Mihal » 06/14/2012 12:53
Re: How to tie a fish key
Message 6A3AP » 06/14/2012 13:27
Re: How to tie a fish key
Post by VovoS » 06/14/2012 16:17
Re: How to tie a fish key
Post by Mihal » 06/14/2012 18:31
Re: How to tie a fish key
Post by wasa_g » 06/14/2012 21:35
Re: How to tie a fish key
Post by Gonza » 06/15/2012 10:32
I don't participate in social networks! I don’t give advice on repairs via Viber, Skype or TED! Spare your time. The telephone was invented in 1876! Use it.
Re: How to tie a fish key
Post by Mihal » 06/16/2012 13:17
Re: How to tie a fish key
Post by Mihal » 06/16/2012 13:20
Re: How to tie a fish key
Message 6A3AP » 06/16/2012 13:56
Re: How to tie a fish key
Post by Mihal » 06/16/2012 14:40
Re: How to tie a fish key
Message 6A3AP » 06/16/2012 15:36
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”.
Making a fish key for Mercedes
8,000 rubles
Diagnostics
If your key is faulty, our technicians, using a special programmer, will quickly and accurately determine the status of the key, diagnose faults and decide on further actions. Thanks to the availability of professional equipment, diagnostics of a key in our company takes literally a few minutes.
Based on the results of the study, specialists will reprogram the key, replace faulty parts or completely replace the electronic board.
Fast key recovery
Often, car owners who have not yet encountered the problems described above do not suspect how much time, money and nerves the seemingly simple procedure of obtaining a new key from an official Mercedes dealer can take. You can receive a new key in a month, after which you will have to use a tow truck to transport the car to a technical center to have the key adapted.
We offer you a much more acceptable alternative - quick production of a smart key. To do this, we have all the necessary equipment and qualified, experienced personnel. Even if you have lost the only copy of the key, we can still make a duplicate for the lock. We will also re-register the new key in the system for your safety - after that it will be impossible to open and start the car with a lost (or stolen) key.
If the key simply does not work, we can read all the necessary data from the ignition switch using the diagnostic connector without rude interference with the car.
Making a key remotely
Thanks to modern equipment, you can restore a Mercedes fish key using the ignition lock remotely, while in another city.
Flip key body 2 or 3 buttons.
No batteries or internal chip. No logo.
Smart key body (FISH) 3 buttons.
Tuning. Upgrade of an old key
Model of a chrome case to replace the black “fish” with a “PANIC” button.
No batteries or internal chip.
For Mercedes models up to 2005.
New type key for 2000-2005 models
433 MHz (no panic button) or 315 MHz / NEC chip / hu64 blade
Compatibility:
C-Class (2001 - 2007) E-Class (1998 - 2009) CLK (2001 - 2009) ML (2005 - 2010) SLK (2005 - 2010) S-Class (1999 - 2006)
NEW ORIGINAL MERCEDES BENZ SMART KEY (CN002018)
315 or 433 MHz / NEC Processor / 3 buttons / service key included
Compatibility:
Mercedes-Benz (1996 - 2005)
NEW ORIGINAL MERCEDES BENZ SMART KEY (CN002053)
Part No: A/A2049051704
ORIGINAL
2 buttons / 434MHz / system FBS3 / with logo / HU64 blade
Compatibility:
W204 C-Class
NEW ORIGINAL MERCEDES BENZ SMART KEY (CN002049)
Part No: A/A2229053900
ORIGINAL
3 buttons / 434 MHz / system FBS3 / with logo / HU64 blade
for European cars from 2011
NEW SMART KEY MERCEDES-BENZ 2000+ (CN002022)
BGA Key 2000+
3 buttons / 434 MHz / HU64 blade
705 Moto (1997 - 2000) NEC (2001 - 2005) NEC (2006 - 2010) BGA (2011+)
NEW SMART KEY VVDI for MERCEDES BENZ (RK19B)
FBS3 BGA Keyless Go Smart Key
3 buttons / 315 or 434 MHz (variable frequency) / HU64 blade / with keyless entry system
Compatibility:
W221 (2009 - 2022) W216 (2009 - 2022) W164 (2009 - 2022) W251 (2009 - 2022)
Including S/ML/GL/R series
NEW ORIGINAL MERCEDES BENZ SMART KEY (CN002059)
FCCID: NBGDM4 / A1679054203
No one except there.
