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Troubleshooting & Technical Questions & ModificationsHave technical or modification questions about the Crossfire?
Find out the answer, or give advice in here!
Padgett - The photo is good information. I've never seen a "valet" key for any car. Is there a chip inside the black base of the key? Since this key either bypass's the SKREEM or communicates with the SKREEM, allowing the car to start and run, it may be the answer we've all been looking for. Any idea's, anyone?
I look forward to your report on the chip's and tool that you mentioned above. Let us know how it works and if it is successful.
Is there any safety that somehow stops the garage or whatever that takes your car from you from cloning your key?
Originally Posted by Padgett
OY.
Ok I have received the five RFID chip. Programmer from eBay should be here on the 8th. The "valet key" below can manually open the door or trunk and operate the ignition/start/run the car.It just has no remote capability.
By the muddle of January I should be able to answer other questions.
Anyone know where I can get just a circuit board ?
Where did you get this key from? They are not listed in any Crossfire literature I have seen. It should not open the trunk, gas cap or glove box, or does it?
I think it's more like string theory, somewhere in the 5th dimension.
Anything to do with those angry pixies running around is pure magic to me.
I do not think copying something like this can be too hard, reverse engineering is a compulsory class in the 8th grade in China.
Another class is designing packaging for products that are nearly impossible to open.
Last edited by onehundred80; Dec 29, 2018 at 03:30 PM.
From: Key Largo FL . . . The fabulous Florida Keys
Re: Let's discuss the key fob transponder chip(s)
Originally Posted by onehundred80
Why can’t we duplicate this circuit board? It is not quantum physics or what ever that is.��
Hi Dave, Respectfully, I think you're confused about the function of the circuit board in the key fob. My belief and experience is that the key fob circuit boards are "generic" and can be programmed to any Crossfire so as to lock / unlock / sound the panic alarm (but not to start and run the car) The circuit board is not tied to the SKREEM (disabler) module and is not tied to the "chip" in the key fob that is needed to start and run the car. A working circuit board from any OEM Crossfire key fob (old or new) can be (re)programmed to to work with another Crossfire. I'm not positive about the circuit boards that come with those "cheapie" key fob replacements (the black ones readily available on E-Bay) as my experience with one of those was that I could not program their circuit board to my Crossfire. Maybe someone else can chime in if they were successful in programming the circuit boards on those black replacement key fobs.
Hi Dave, Respectfully, I think you're confused about the function of the circuit board in the key fob. My belief and experience is that the key fob circuit boards are "generic" and can be programmed to any Crossfire so as to lock / unlock / sound the panic alarm (but not to start and run the car) The circuit board is not tied to the SKREEM (disabler) module and is not tied to the "chip" in the key fob that is needed to start and run the car. A working circuit board from any OEM Crossfire key fob (old or new) can be (re)programmed to to work with another Crossfire. I'm not positive about the circuit boards that come with those "cheapie" key fob replacements (the black ones readily available on E-Bay) as my experience with one of those was that I could not program their chip to my Crossfire. Maybe someone else can chime in if they were successful in programming those black replacement key fobs.
I think you have misunderstood what I am trying to achieve.
I realize that the circuit board is just for opening the doors, the trouble is getting one. If we can train a chip and cut a key all we need is a circuit board to complete a fob that works on our cars. Simple.
Yes it's the same key. A lot a Mercedes cars from the same era used these keys. Search for a "KR55" key. There's two systems, right hand drive cars use a 2 button key and SKREEM that work at 433MHz, left hand drive cars (USA) use a 3 button key and SKREEM that work at 315MHz.
OY.
Ok I have received the five RFID chip. Programmer from eBay should be here on the 8th. The "valet key" below can manually open the door or trunk and operate the ignition/start/run the car.It just has no remote capability.
By the muddle of January I should be able to answer other questions.
Anyone know where I can get just a circuit board ?
I await news of the outcome, I like excuses to buy gadgets like this.
Zed-Bull program:
OK now have the programmer and can read a fob but the instructions are in mock-swedish and I an not sure what half of the buttons are for. Is there an English version ?
OK so gave up on the PC for the moment and just used the device. Results were frustrating. Went through the process for cloning original had a bunch of data and Type 33.
Cloned new chip, everything verified with same data and same type..
Tried in car - no go.
Read chip. Now has correct data stream but "Type: Blank Philips"
Went through the process there more times. Verified Type 33 after writing but when I read the chip it is "Type Blank Philips" and does not work.
Does anyone have one of these programmers and does it work. Am I missing something ?
Re: Let's discuss the key fob transponder chip(s)
The first chip shows PCF7930, second picture PCF7935. Have no idea if that makes any difference?