I know that the key fob for our cars contains both a transmitter and transponder that communicates with the car to create a no-start condition if an attempt is made to start the car with a non-original key. After reading the article about disassembling the key fob, it appears that there's no battery in it (or is there?). How does this communication take place? Doesn't the key fob need a power source if it's to transmit and respond?

 

After I wrote this I went to Wikipedia and got the answer by searching "Transponder Car Key." Very interesting. You can check it out at: https://en.wikipedia.org/wiki/Transponder_car_key

 

The key fob has 2 CR2025 batteries in it.

 

There IS a battery in the key fob ( actually 2 ) , but they are just for generating the RF signal to lock and unlock.
There is a un-powered transponder chip inside also that is excited by the key ring surround antenna when the ignition is turned on. This causes the chip to oscillate and that is detected and compared to the stored code in the SKREEM to allow the engine to start.

 

On MOST cars (not ours of course) there are 3 ways of programming the transponders. Depends on the make. Most cars can only have up to 8 keys in the memory. Notice the xfire uses the same key codes (3501-6700) as the Mercedes c-class, yes there are codes available for the x-fire but it does us no good. C CLASS - C220, 3501-6700 Dealer Key Service Key HU64P High Security Key. Crypto 1997-2009 All 83 C230, C280, C43 Transponder, Ordered by VIN

Generally you can have 2 working keys and do a series of turning on key removing and either turning on the other good key or pressing brake pedal/gas pedal or something. That lets you add/program your own new key. Here is the reference EVERYONE uses to identify make/model/year/brand of transponders with instructions. The on board programming instructions start on page 150. This reference also shows the correct key blanks for non transponder keys also.

https://www.dropbox.com/s/p1gjxusjnk...rence.pdf?dl=0

You can also use a program to "open" the computer and allow you to add in the new key.

The third is use a auto clone tool. What it does is reads the signal coming from the working key and programs the new key's signal to match the working key so the car thinks it is the old working key. It works on most cars and is the easiest way if you cant use on board programming. I can buy most transponder keys under $10

The American Key Supply Guide to Cloning : American Key Supply, The Locksmith's Source for Keys & Tools

 

Very informative.....great info to have....thanks all.

 

Yes, we are "high and dry" when it comes to our keys. You can charge anything you want when there is only one supplier.


I Can Clone Any Key. Actually, that's close, but not totally right. Now that the cloning tool makers have cracked the Philips 46 chip, we're up to about 95% of cars that we can clone. Examples of vehicles that we still cannot clone in the US market: most BMW, MERCEDES, most VW, Volvo, 2010+ Toyotas (G & H chips), and 2011+ Fords (80-bit). Most manufacturers also have one or two oddball models that use unpopular chip types that clone makers just haven't found it profitable to try and crack.
UPDATE: The KeyLogic US900 Cloner now supports Toyota G-chip cloning (requires purchase of G-box).


I can copy or code cut the "Regular" cuts no problem. Programming the transponder, ain't happening.

 

Hi there

I live in New Zealand and went into the chrylser dealership in my town to order a 2004 crossfire key for my crossfire purchased recently. They wanted $1200 for it and said that they would order it in from chrysler in the USA. I nearly died at the price asked.

Can someone help me out her with advice please. I went into a local remote key merchant specialist who said that it was impossible to replicate the crossfire key as it was a specilaist job and that you needed to go through the dealership. I note that the Chrysler Crossfire store will do this for US $200. Are they genuine and do they do it properly i.e. access the details via chrysler to ensure that you get the correct transponder key etc.

Much appreciate your feedback via this forum.

cheers
Dazraz

 

Contact Rob at Needswings : https://www.needswings.com/contactus

 

Yep, that is what I did last summer, no issues, it arrived and works fine.