repairing broken W202 Key fob.

[television]

I think thats well worth trying, as you say its likely to be the chip that has the stored information, my one word of caution would be, are you skilled enough with a tiny soldering iron to do the job? I say this after "having a go" at replaceing a battery in my wifes Ipod, 3 hair like wires which passed through holes in the circuit board and were then soldered with "pin head" sized spots of solder, proved to be a real bugger to remove and when I had finally managed to resolder the new battery I found one stereo channel not working, I guess where I had fried some componant, so unless you are used to working with micro circuitry them you might be better off getting someone else to actually do the job for you.
Good luck and do let us know how you get on,
Steve.

Very good advice above,,, so easy to get a TV repair man to do the job, I have seen some horrendous damage done by home soldering.

Soldering with out damaging components is an art

 

[rangyrider]

Mercedes C220 Key remote

Thanks what a great helpful guide,
Tried your fix and worked perfectly, only took 10 minutes to repair remote,
Microswitch broke off, Soldered back in place ALL OK,
When first repaired did not see light from unit so thought it would't work,
But tried to lock car with first press and hey presto worked 1st time,
Now functions better than before must have been breaking up since i have had the car ( 15 months )
Just to let you know Mercedes wanted £230 for the remote and then £70+Vat to programme and i still would have needed a tow to get to the garage so in all a no cost repair, Brilliant many thanks,John.

 

[Adamka]

I have a problem with the key of my E-class 124. The part no on the key is 14076003/0706.
The key stopped working about a week ago. Sometimes it works but mostly doesn't. The batteries are good. If I press the button for more than 1 sec the red LED lights up. If I look at it through the camera of a mobile, most of the times I don't see the infrared light. I checked the soldering points with a magnifier but didn't see any crack.
Does anyone have an idea how to fix it?

 

[television]

Check that the tactile switches are not faulty, give them a squirt of switch cleaner or replace them

 

[SeeYa]

My problem is that, having fixed the remote fob, it still will not unlock the car and when I use the key to open the passenger door this sets off the alarm which stops about 10 seconds after I've closed the door.

Any similar experiences, thoughts, solutions?

Pete

 

[television]

Try the re sync in the DIY section under electronics

 

[aslan]

Hello Gentleman Great forum you have here .
Please help as my Fob has suddenly decided to die on me (C-180 1998 Three button key less Fob).
out of the blue it decided not to lock my car or do any other communication with it , if you put the key in ignition it will start it but since this after noon (when the fob died) the fob some time refuses to start the car aswl but gives in after couple or tries .

i took the key to a friend who runs a car security systems installation shop and asked him if he can change the batteries (which were changed 3 months ago) he put in new batteries still nothing , so he went in deeper this is what he think is happening when the battery pack touches the PCB contact the PCB led blink for a second and then gets hanged ???? he thinks that the voltage drops or gets hangs after the initial contact so some thing has gone wrong in pcb .
so please help me guys if you have any solution like the above ones described here .
Thanks in Advance
p.s we did the camera test the fob is not working or showing any light .

 

[television]

You need to look closely at the tactile switches, the legs can break off

 

[aslan]

what are tactile switches and where are they located ?

 

[television]

They are the actual switch push. it they are ok then check for any tracks that could be open circuit.

The contacts that go to the batteries can become loose on the PCB

 

[wanderer720312]

thank you so much for the brilliant information

Woww First of all bravo for daring to disassemble the key,and then really thank you for this info that will for sure help a lot of people.
my second key is now operating again

 

[salman]

Key not working

Hi folks,

Need your valuable advice as 1 have lost one of my keys n the other not working so in desperate need of help....

Actually,I pulled out the key from ignition with force and it has broken its front sensor bit (i guess thats what its called...sorry i'm not a techie person AT ALL), and now the key isnt working.it opens and closes the door locks but when I put it in ignition the key doesnt come out and the car doesnt start...

Took it to mercedes aftersales n they think i need a new key for 227 pounds....please if anyone can suggest a solution or a cheaper place where I can take for repair...i live in west midlands....any advice n suggestion will be hghly appreciated...

thanks

 

[television]

It needs a picture of the key before we can comment on a repair

 

[salman]

Plz havea look

 

[television]

I think that is too far gone, you could send both to Mark in birmingham and he can probably do something Or maybe I could do something with both, but it all takes a few days

 

[salman]

whereabouts in birmingham are you?i can bring it today?what are timings?how much would it roughly cost?
thanks

 

[television]

You need to speak to Mark, I am a long way away

http://forums.mercedesclub.org.uk/showpost.php?p=685215&postcount=160

 

[salman]

Key not working

Hi Mark,

I have been referred to you by "television".here's my story:

Actually,I pulled out the key from ignition with force and it has broken its front sensor bit , and now the key isnt working.it opens and closes the door locks but when I put it in ignition the key doesnt come out and the car doesnt start...

"television" mentioned u r based in birmingham...whereabouts in birmingham are you?can i bring it today?how much would it roughly cost?

thanks

 

[television]

Send an Instant Message to MarkPRP Using...
MSN vito-spares@live.co.uk
Home Page

http://www.replacementmercedeskeys.co.uk
This Page

http://forums.mercedesclub.org.uk/member.php?u=39691

 

[kenb]

key fob

hi ive just joined the forum to have a look around the w203 stuff, i had a problem with my key fob not lighting up, so a search soon brought up this thread, followed the pictures and there it was broken switch, so thanks to andy and the forum

ken