DIY: New Chrome key upgrade/retrofit.
With the main idea of getting the induction coil and soldering it onto my key without one. Unfortunately, it didn't have the correct induction coil.
I did see it did have a 30pin chip the same dimensions as the nec chip with the numbers F9234. Although I don't see the other larger chips (AMS and what not) on the board. Think it would be worth a try to switch chips?
The reason I ask is that the Mercedes logo fell off from one of my fobs (Version 1), but Version 1 is difficult to find used; Version 2 is a lot easier to find. I just want to take out the circuit board from my original fob (Version 1) and pop it into a new one (Version 2). I don't need to swap the ROM chips or anything.
Last edited by nkx1; Apr 9, 2019 at 09:58 PM.




The old all plastic black smart key and the new facelift chrome key are identical in the fact that they both are made of plastic i guess. The chrome part of the facelift chrome smart key are chromed plastic i guess but i will not say it for sure
So a while back my car randomly wouldn't start. Saw that the Transponder coil was damaged. I eventually got the Rounded Panic version chrome key off of ebay, and had a professional microsolder the chip in.
The key unlocked my doors just fine, but doesn't work on the ignition (nothing happens when I place the key in.)
I tried pressing the buttons to see if I can see an IR signal from y Phone's camera and didn't see any...but I assume there is one if I can unlock/lock the doors.
Maybe a fuse is bad? which fuses would I check? Any help would be great.
EDIT. IR does work with face cam and not back camera
Last edited by Bc Valdez; May 15, 2019 at 07:04 PM. Reason: More info
The Best of Mercedes & AMG
So a while back my car randomly wouldn't start. Saw that the Transponder coil was damaged. I eventually got the Rounded Panic version chrome key off of ebay, and had a professional microsolder the chip in.
The key unlocked my doors just fine, but doesn't work on the ignition (nothing happens when I place the key in.)
I tried pressing the buttons to see if I can see an IR signal from y Phone's camera and didn't see any...but I assume there is one if I can unlock/lock the doors.
Maybe a fuse is bad? which fuses would I check? Any help would be great.
EDIT. IR does work with face cam and not back camera
The reason I ask is that the Mercedes logo fell off from one of my fobs (Version 1), but Version 1 is difficult to find used; Version 2 is a lot easier to find. I just want to take out the circuit board from my original fob (Version 1) and pop it into a new one (Version 2). I don't need to swap the ROM chips or anything.







