What is the ring around the ignition called? - Mercedes Benz SLK Forum

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#1 Old 03-14-2013
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What is the ring around the ignition called?

Hi, I'm starting a new thread because I don't know how to search for the part in question. The metal ring around the ignition for my car (2001 SLK230) has a chip and cuts my knuckle when I turn the key. I taped over the chip, which helps -- but now it's just ugly. I somehow have the right part and have an idea how to take apart the dash in order to replace it. However, there is a wire on the part and I was afraid that if I replaced it, it may somehow mess up the match between my key and my ignition. Does anyone know if this is the case? And, if so, what I can do to prevent it?

I've attached pictures below for reference. Sorry two of them seem to be flipped on their sides.

Thanks!!!
-L
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#2 Old 03-14-2013
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#3 Old 03-14-2013
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Thank you!!
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#4 Old 03-14-2013
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Hmmm... I would say it acts as a magnet marking the position of the key when you turn it. The question is whether it receives the signal (electronic key) from the transponder and sends it to the ECU or whatever...or not.. I think if you call your mb dealership and ask them if you simply can replace it or if it has to be ordered especially for you VIN then it would give us some hint.
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Indeed, this ring is called "Immobilizer transponder ring".
Here's what one website says about it: "Transponder keys emit a special signal to the ignition to let it know that the right key is in the lock. The signal receiver in the ignition is known as an immobilizer."
From now I personally would be cautious replacing this thing. If it acts as a "mean" (which is most likely) by which the signal is sent/received then it's ok. It just reads the code from the transponder located in the key and sends it further to the immobilizer. That's why you have a wire - it connects to the immobilizer.
What I would do is disconnected the battery, replace this ring and try to start the car. In the worst case it can show you "Start Error" on the dash board". Then disconnect the battery and replace it with the old one.

Let me give you an example. I had an ignition lock fully changed couple months ago and tried to start the car with the key provided with the lock. (Apparently this key is used to configure the lock pins and not for starting the car, since it doesn't have any transponder). The car didn't start and I saw "Start Error" on the dashboard where mileage is. I simply disconnected the battery, removed the key, reconnected it and normally started it with my OEM key fob.

Hope I gave you the overall idea. That's how understand it, and I think it shouldn't be a problem when replacing it since this part acts as "Intermediary" between the transponder in your key fob and the immobilizer.

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#6 Old 03-14-2013
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Thanks JaysonM! I will report back shortly.
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