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:

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 A perfect copy of the key won’t work either, even if it is a similar transponder key, originally made by BMW.

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.

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.

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:

Good luck and thanks for reading.

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