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  #1  
Old 10-22-2019, 09:52 AM
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06 E53 EWS 4.3 transponder chip

Hi all,

I've got just one key so I purchased an AK90, some key blanks and am able to read my existing key as well as the EWS. I cannot write the transponders that came with the new keys. The new keys are "supposed" to be correct for this car according to the seller.

The transponders are ID44 PCF7935AA. From what I can find, the PCF7935 is for up to 2004 X5. I searched for a while and cannot find a reference to which transponder chip is appropriate for an 05/06 EWS 4.3 equipped car.

Searching for "BMW transponder catalog", I find a list at auto-keys.eu that shows
BMW MINI COOPER
2005 2007
Transponder Philips Crypto 2 | ID46 | PCF7936 ( BMW EWS4 system )

If anyone has any input, it would be much appreciated.

Thanks
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Old 10-22-2019, 11:05 AM
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There are 2 different frequencies. One for USA and one for EUR. Where was your X made?

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Old 10-22-2019, 01:42 PM
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I'd guess US, but I'm not certain. It's a USA model.

Prod. Date 2005-11-17
Type X5 3.0I (USA)
Series E53 (X Series)
Body Type GEFZG
Steering Left Hand Drive
Engine M54
Displacement 3.00
Power 170kw / 231hp
Drive ALLR
Transmission Automatic
Colour ALPINWEISS 3 (300)
Upholstery KUNSTLEDERHELLBEIGE 2 (ARBEITSNAME (K4HC)
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Old 10-22-2019, 03:37 PM
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First of all, were you able to synchronize the key with car locking and unlocking?
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Old 10-22-2019, 05:40 PM
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Yes, the new keys lock and unlock just fine. It's the transponder chip that the AK90+ cannot program to the EWS. It looks like the transponder chips sent with the keys are for EWS 3.
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Old 10-22-2019, 08:48 PM
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Quote:
Originally Posted by EODguy View Post
There are 2 different frequencies. One for USA and one for EUR. Where was your X made?

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Frequency variations are NOT connected to the EWS transponder chip - the EWS transponder chip is the same world-wide. The localised frequency variations (315MHz and 433MHz) are related to the remote locking/unlocking and alarm activation - totally separate from the EWS transponder chip (besides residing in the same key fob...).
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Last edited by wpoll; 10-23-2019 at 03:08 AM.
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Old 10-23-2019, 01:50 AM
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Mine is a 315 MHz US version. 433 MHz are for European (and maybe ROW cars). I've had the rear hatch trim off and see the receiver that has boldly printed 315 MHz on it. And the replacement keys unlock and lock remotely without a transponder chip.

The transponder communicates with the EWS to authorize the vehicle to start.

This question revolves around the EWS 4.3 and which transponder chip is compatible with it. Perhaps the Am**** seller of the key will reply to my message. I've got the keys already cut and don't really think I'll be able to send them back. Just need the right transponder chip and they are pretty inexpensive. It seems pretty clear the PCF7935AA isn't compatible. Either that or I take my current key and tape it into the steering column and not worry about it...
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Old 10-23-2019, 03:36 AM
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I fixed my typo in my earlier email - yeah, 315MHz in the USA and 433MHz everywhere else.

It 's a lot easier with the older VW transponder chip (ID13 and ID48) - it's in a small glass capsule, so easily moved from key to key. I've also bought new ones and programmed the car to include them. I think it was like $5....



Now I think they use the ID44 chip...



Looks like this source agress with your findings re. the ID46...

BMW Transponder Chip Catalog. Extended guide with descriptions about transponders & keys

I can find other sources that state the ID44 chip works on the E53 X5 1999-2006...

Maybe someone who has opened up a a dead LCI key confirm the IC part number...
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Old 10-23-2019, 03:58 AM
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Answering my own question here - about the OEM EWS transponder - looks like the OEM diamond key uses an ELMOS 10030A transponder...



The ELMOS chip is just the transponder code component - the board contains the induction coil antenna for powering and Tx functions.

The PCF7935 and PCF7936 chips include the induction coil antenna etc.

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Old 10-28-2019, 01:53 PM
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Thank you all for your input!

I've ordered a package of ID44 PCF7935AA transponders because the folks at keyecu.com said these only use ID44 chips. I came across a picture of someone holding it vertically in the programmer instead of a video I saw where they simply laid it in the bottom. So I can try various orientations to see what works.

I'll post an update in a couple of weeks (because they are coming from China).
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