My key fob stopped working all of a sudden!
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Joined: Apr 2019
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C180 2005 W203 Upgr
My key fob stopped working all of a sudden!
Hi all so today I used my key fob and the next moment it is mot sending signals (the light is not flashing) swapped the batteries with new ones and still the same. No drops or shocks. Completely out of the blue! Thank you!
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C180 2005 W203 Upgr
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Joined: Dec 2005
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From: redondo beach, ca
2005 C230 SS
had that happened to me a few months ago with my c230k when i got it i didnt get an extra key. so i was having starting it up for a while. changed the batteries to no avail. got many recommendations to get another key to test to make sure its not the mechanism in the steering column...so bit bullet and got another key for $320...it was the key, all is good now. imo expensive way to test, but hey at least it wasnt the mechanism in the steering wheel column
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Joined: Jul 2011
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From: Hawaii
2017 GLA 250, 2011 C63 P31 (p30 w/ lsd) (in repair), 2005 C230 Sport Eurocharged, 2003 C320~sold
You state your lock/unlock and trunk works then your infrared and led should blink. Use your phone camera, face it at the end of the key and when you press it you should see a purple led blink. You cannot see this with your naked eye and has to be viewed through a camera.
The remote function is a separate function from the key actually starting the car. The key battery can also be dead and still start the car as the computer reads the key when it is inserted and the battery is only used for the lock/unlock function.
You have 3 options -- 1 is clean the key, 2 is repair the key and 3 buy a new one. Depending on your skill level you may only be able to do option 1 and 3.
Clean your key --
Repair the key with another circuit board and solder your existing microchip onto it -- (dont worry about the key reader -- you are only wanting to follow the chip replacement and testing in your ignition)
If you go with another circuit board ensure the key type / model number you purchase is a match (i think FCC ID and another number on the plastic that holds the battery)
Most expensive and last resort option is to buy a new key from a dealer
Last edited by krazzdav; Apr 25, 2019 at 01:25 AM.
