EWS Deletion Chip

Posted by Richard 1 February, 2010
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UPDATE:

One of our customers, Jerryvan Rosado, sent us some valuable information on his experience with this method. It is as follows:

Thank you for the chip it worked perfect. Just wanted to comment something since I didn’t see it in the Tech docs you guys posted about bypassing the EWS-II system. I installed the chip and cut connection #66 from the ECU but it still needed the key’s chip to start so I went into the EWS Module behind the glove box then cut and joined wires 1 and 3 from the EWS. They are the ignition and switch cables in order to properly bypass the EWS Module. After that, now even my remote started works from up in my apartment with no chip in sight in or out of the car. Just though I could point out that I did since I didn’t see it in your post here at EWS Deletion Chip.

Thanks.

~Jerry”

Once again, thank you very much Jerry, for this valuable information. We are sure that you are helping many BMW users by sharing your experience.

-Richard

We have often been asked for a EWS delete chip. That is, a chip that boost power of their 1995 325i or 525i, and deletes the EWS protection at the same time.

First of all, what is EWS? EWS is an anti-theft system installed in BMW cars around 1995 (EWS-II). Later cars use EWS system too, but different versions (EWS-III, for example). It is similar on its idea, to the immobilizer system used in other cars, like Toyota, Honda and VW.

Schematic of the EWS-II system:

BMW EWS-II System Block Diagram

 

In the 1995 325i / 525i, it is used the EWS-II. Those cars have module (EWS Control Module), pictured above as “EWS II”, that connects to the ecu (”DME” above). The car key sends an unique code through the key lock cylinder, to the transmitter/receiver module which amplifies the signal and convert it to a digital signal and then send it to the EWS control module. This module will compare the received code with the code stored in the ecu (”DME”) and if the same, all normal functioning is resumed. Otherwise, the starter might work or not, but there will absolutely be no injection.

In short, your car can only be started with your key (transponder key). The key has a micro chip inside with the unique code stored on its micro circuit. Your car’s ecu will only “listen” to your key. A perfect copy of the key won’t work either, even if it is a similar transponder key, originally made by BMW.

Chip inside the EWS Transponder Key

 

So an EWS delete chip, has as part of its functions, the disabling of this system. We don’t have one of those chips available, but the one we have (www.racingchips.net) can be used if some wiring tampering is done. Our chip is meant for Non-EWS ecus (0 261 200 413 with RED label or sticker, NOT Silver colored). If our chip is used without the tampering on EWS enabled ecus (silver label or sticker), the car won’t crank or will crank but will not start.

You can install the Non-EWS chip and manually disable the EWS system by locating the EWS Control Module (location pictured below) and cut or disconnect the wire #7 (solid green colored). This will allow the chip to give its power and not been interrupted by the EWS system.

Location of the BMW EWS-II module

Other alternative, is to disconnect the same wire from the ecu instead. On the ecu it connects to pin #66, as shown on the image below. The image is of the harness terminal and NOT of the ecu terminal. That is why numbers are on inverted order. Click on it to see it full size.

BMW 413 ecu connector pinout

 

The cons of this are of course, that your car will no longer be protected by the EWS system as long as you have this modification.

Reaching the EWS Control Module:

How to reach EWS-II Module - Step 1, 2 and 3

How to reach EWS-II Module - Step 4 and 5

Good luck and thanks for reading.

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Comments
March 21, 2009

I have a question, if I buy one of those chips, will they work on my ews ecu if I cut the wire #7 at the ews module foe sure?

PostedbyNeftali Hernandez
March 21, 2009

Welcome again Neftali. Yes, if you get one of those chips and your car is EWS equipped, all you will need to do is disconnect the wire #7 from you EWS-II module (or #66 from the ecu). That’s all and your car will be brought to life like magic with the chip installed.

Thanks for reading,

Richard

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March 23, 2009

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July 30, 2009

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PostedbyxXmikeHepXx
August 30, 2010

Hi everybody.
Thank you for some interesting input regarding EWS and installation of a modified chip.
Maybe this is a silly question since it may already have been answered but I really need to be 100 % sure before I buy and install a new chip.
Can I install a NON EWS chip in my ´95 530i V8 wich have EWS, IF I disconnect cable number#7 on the EWS module or #66 at the ECU as described earlier in the thread?

Best regards – Peter.

PostedbyPeter Lundorf
September 1, 2010

Hello Peter.

There is no silly question my friend. The only silly question is the one that is not asked.

About the 1995 530i, it uses the same EWS system, and after checking the diagrams, it is also connected to wire #66 of the ecm, so we have not done the test, but being the same everything, it should work as in the 1995 325i/525i. The wire should also be color green.

Best regards,

Richard

PostedbyRichard
September 2, 2010

Thank you very much for the answer Richard. I will purchase the chip now and let you all know how it goes with the EWS wiring stuff.
I will take the car to the dyno later today to see std. power figures. After the new chip is hopefully succesfully installed I will make a new dyno run to see the changes.

You will hear more soon.

Peter – Denmark

PostedbyPeter Lundorf
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