My roadster I am picking up Saturday only has one key and the fob looks terrible. After reading about taking apart the fob and replacing the case, I read that the transponder has to be the actual transponder frequency to work. Can you not use a clone machine for the XF? The price for a replacement key from Chrysler looks to be about $150. If I cant use a cloner, I was thinking about removing the transponder from the one good key and attaching inside the column close to the antennae and just getting a few new cases from Ebay and a few of the used circuit boards for the lock/unlock buttons and putting together my own. I can cut the physical part of the key blade myself. Besides the obvious problem of disabling the security of the transponder, what am I missing here? I can put together 7 or 8 "new" keys for $150.

 

That's an interesting question, the transponder looks like a piece of black plastic located right behind the red plastic of the pod, if you mounted that plastic piece close to the receiver? I'm with you, why wouldn't it work with any key cut to the tumbler. It will be interesting to see what the 'electronic pros' have to say on this one.


Dave

 

Read the case swap tutorial again. You just put the old guts in the new case.
Existing cut key, electronic board, and transponder all go in new shell.

https://www.crossfireforum.org/forum/tsbs-how-articles/22470-how-take-apart-key-fob-without-destroying-7.html#post823751

https://www.crossfireforum.org/forum/tsbs-how-articles/22470-how-take-apart-key-fob-without-destroying.html#post208484

 

Maybe this will help https://www.crossfireforum.org/forum...mobilizer.html

 

I only have 1 key and need several more and don't want to spend $150 each. If I take the small transponder chip from the 1 original and attach into the column I could have as many as I would like really cheap. I could also cut the physical part of the key on a "regular" blank without the buttons and it would be small enough to fit in my pocket/key chain.

PS-I am a locksmith so cutting the key is no problem

 

Just buy the empty cases on Ebay.. they are just as effective as buying the other ones and cheaper.

 

Those are all good answers for updating his key pod, but that isn't Travish's question, he wants multiple keys and is wondering if he takes out the transponder and mounts it close to the receiver, can he cut extra keys and have them all work, excluding the pod altogether? It's an interesting question and I don't see why that wouldn't work, naturally you are eliminating some theft protection.


Dave

 

I wouldn't want to lose the anti theft but as the link to the push button start thread shows. You can attach the transponder to the ring and then use a standard key.

 

Just anyone that doesn't have the OEM fob will be door in key only.. for locking and unlocking. Don't have a clue if that alone will set the alarm module, but easy enough to test out.

 

From what I have read the door opening signal uses random code technology and the only coded signal that will open the door is saved in the SKREEM. Therefore not just any fob will have the code only your fob(s) will know the correct signal.
How this is achieved is beyond me.
I suspect that the chip in the key has some affect on the signal sent.
Can another transponder side by side with the true chip and programed in the ignition be made to work? I frankly have no idea.

We have some smart people here and they must know.

 

From what I understand from reading is that the Transponder "chip" in the fob must be the "original" or ordered for the car so it has the correct id for THAT car but the lock/unlock circuit board just has to be programmed by pushing buttons and turning on key. Is this correct?
Thanks
Travis

 

Nope.. was reading in DAS a couple weeks back.. there are 10-15 codes (can't remember exactly) that are "usable" by each car.. and they can be temporarily removed from "working" or permanently removed.

 

Travis,

I believe you are on the right tract, the transponder 'chip' has the code burnt into it, it can't be re-programed and it's only for your car's serial number. A virgin chip can be programed for you car with the right equipment but I believe that would have to be done by a Mercedes dealership. I'm not sure about the door locks, it would seem to me that they would be separate. Your idea of permanently planting the chip next to the tumbler assembly sounds good to me, I'm not sure how 'needed' that theft determent is, heck, none of my vintage cars have it. But that chip looks like a piece of black plastic, like a plastic tab that broke off something, it would be easy to lose if not secured well. I don't know if you would want to glue it, maybe if you put in in a clear plastic container and secured it, it might work, or attach your old pod near the tumbler assembly?

Dave

 

The lock unlock function must be programed by Chrysler into the circuit board within the key fob. It cannot be reprogrammed to a different SKREEM. Although the term reprogram is often used. It can only be reset to the original SKREEM as in after battery failure.

The ability to start the car requires that little black thingie to be in proximity of the transponder ring.

 

Damn it, I guess they are going to get you somehow. Looks like a new Ebay case for the lock/unlock board from the original with the blade part of the key functional, put the original transponder chip inside the column. One more complete "new" $150 key as a spare and several regular keys with no transponder or unlock board to use to lock/unlock the door with the key and start the car but not to set the alarm.
Thanks everyone

 

I did this on my 2006 xfire attached the chip to the ignition ring inside the rubber ring. I use extra keys that I had made and the xfire starts not problem( so far). 1st cav

 

If you think about it you have got rid of a theft barrier, you would not be covered if your car was stolen. Any one who knows you have done this could hot wire your car.

 

Where do you live? I want to stay away from there. My car is garaged and when I'm out its not far from my sight.

 

Sounds like you live in it.😉

 

You are a minimum of 2038 miles from him. The danger of being around Dave is not that he will steal something from you, it's that he will make you look (or at least feel) stupid.

If you can't get comfortable with that (as most of the rest of us have), you may want to reconsider posting on this forum, cause it aint gonna change.

Fact is, you have made the car somewhat easy to steal. All that is needed is a mechanical ability to get past the locking mechanism. You defeated the REAL roadblock - the fact that the car's "immobilizer" (a STUPID name for it) has been, in effect, disabled, means that someone with mechanical ability to get past the physical lock can now drive the car off.

Having said that, I have thought of doing just what you did, but since I have two keys, there is no reason to do so.