Bypassing EWS

[ethrty]

Sorry i should have put my two questions together in one thread. Title of other one is inappropriate now.

Anyway, E30 + M52 + OBD2. Please note NO OBD1 CONVERSION

The ECU is connected to the wiring loom, which is connected to the car via my wiring adaptor i made. The EWS module etc i have is not connected to anything yet. What i need to do is exclude that from the system all together, and trick the ECU into thinking that EWS says yes start. I have researched, but i cant seem to find the answer on EXACTLY how to go about it as the M52 and M50 stuff is all jumbled together.

the only two ideas i have came from this thread, more specifically the diagrams. looking at the first one, im thinking that if i connect pin 3 of the x20 connector to 12V, will that tell the ECU its good to go? Meanwhile the second diagram suggests i should connect pin 7. If i can get the car to start/run without the EWS module installed at all that would be great

Also, if my pins are correct, is the input to the ECU from the EWS either 12V or 0V saying start or dont start, or a digital 5V or 0V, or some analouge value that varys from ECU to ECU, EWS to EWS

If im barking up the wrong tree please help! i dont have the chip from the key, buying another ECU/EWS/key etc pack is not an option, and i dont want to have to buy a chip to do it

Engine is not in the car yet, will be going in in the next week or so

[Mossman]

I'm not sure if whatever year your motor was from was on to EWS2 or not, but even EWS1 wasn't that stupid and you couldn't just feed 12v someplace and get it to start. It was looking for some other kind of specific signal from the EWS module, can't tell you off the top of my head what it is but not as simple as feeding voltage somewhere.

Call TRM and talk to them about ews delete flashes on your dme, I think that's the only way. Have them give you a performance tune as well as delete any sensors you won't be running as well (rear o2's?)

[StereoInstaller1]

Here are a few things I can tell you:

-EWS module is swappable
-EWS antenna is swappable

-EWS Key is NOT swappable
-EWS DME is NOT swappable

and

-EWS Key and DME MUST match

EWS module doesn't send an analog signal of any sort to the DME.

The reason I know all of this is due to remote start installs, of which I have done likely 500 with different transponder setups.

Figure this: if they can do a bypass already on a 2010 Ford or Dodge or Toyota, why is there no bypass (that doesn't require a spare key that is) for a 1997 BMW?

Chip the bitch, be done.

GL!
Luke

[ethrty]

Do said chips solder/clip into the ECU or the EWS? the EWS is currently not connected to anything as it was cut out of the E36 loom rather than unplugged, and i would rather leave the module out all together if possible. its just avoiding the headache of finding diagrams to splice it into the E30 chassis.

[rThor432]

^^You wont be soldering/clipping in a chip in a Siemens DME. Gotta have the software re-programmed. One solution to your problem-- You can send the DME to one of plenty of reputable 'tuners' and have the software modified. They can delete things like EWS, secondary O2's, and the secondary air pump (to name a few) from the system.

[matt]

Here are a few things I can tell you:

-EWS module is swappable
-EWS antenna is swappable

-EWS Key is NOT swappable
-EWS DME is NOT swappable

and

-EWS Key and DME MUST match

EWS module doesn't send an analog signal of any sort to the DME.

The reason I know all of this is due to remote start installs, of which I have done likely 500 with different transponder setups.

Figure this: if they can do a bypass already on a 2010 Ford or Dodge or Toyota, why is there no bypass (that doesn't require a spare key that is) for a 1997 BMW?

Chip the bitch, be done.

GL!
Luke

The module is only swappable if you swap keys as well. The key numbers are coded into the module.

You can get any ECU to work with any EWS module as long as you have the right keys for the EWS module by aligning the EWS module to the ECU. This writes the ISN from the ECU into the EWS module.

There is no way to make an ECU run a car without either the correct signal or flashing the ECU to make it stop looking for the correct signal.

[StereoInstaller1]

The module is only swappable if you swap keys as well. The key numbers are coded into the module.

You can get any ECU to work with any EWS module as long as you have the right keys for the EWS module by aligning the EWS module to the ECU. This writes the ISN from the ECU into the EWS module.

There is no way to make an ECU run a car without either the correct signal or flashing the ECU to make it stop looking for the correct signal.

No, I personally swapped modules between cars.

The coding is Key>DME, only passes through the EWS box.

[Eric]

The module is only swappable if you swap keys as well. The key numbers are coded into the module.

You can get any ECU to work with any EWS module as long as you have the right keys for the EWS module by aligning the EWS module to the ECU. This writes the ISN from the ECU into the EWS module.

There is no way to make an ECU run a car without either the correct signal or flashing the ECU to make it stop looking for the correct signal.

got anything for the euro S50B30? my 3.0 has EWS and i need to get rid of it :( more power would be cool too!

[87e30]

I had Matt flash me an EWS delete ECU. Highly recommended.

[matt]

No, I personally swapped modules between cars.

The coding is Key>DME, only passes through the EWS box.

If we're talking about OBD2 e36s, that is not correct. If you're talking about the little black EWS transmitter box you see on EWS2 in e36s then yes that does swap. On OBD2, if you swap the large EWS box behind the glove box, you have to swap keys and align the new box to the old DME as well.

Before I figured out how to flash EWS out of the MS41, I swapped ECUs around many times by aligning the EWS unit to the new DME. The DME has no idea what key is talking to the EWS box. It just looks for its own ISN in a signal from the EWS box.

Sorry, not working with the euro cars at the moment. There is enough interest that I should be, but there aren't enough hours in the day.

[ethrty]

thanks for your replies! looks like im going to have to get it flashed then. Bit of a long shot but anyone know where to get that done in New Zealand? our NZ E30/BMW forum has been down for the last few days :(

[StereoInstaller1]

If we're talking about OBD2 e36s, that is not correct. If you're talking about the little black EWS transmitter box you see on EWS2 in e36s then yes that does swap. On OBD2, if you swap the large EWS box behind the glove box, you have to swap keys and align the new box to the old DME as well.

Before I figured out how to flash EWS out of the MS41, I swapped ECUs around many times by aligning the EWS unit to the new DME. The DME has no idea what key is talking to the EWS box. It just looks for its own ISN in a signal from the EWS box.

Sorry, not working with the euro cars at the moment. There is enough interest that I should be, but there aren't enough hours in the day.

Ah, I see. Thanks, Matt. Yes, it was an OBD1 car.

Luke

[etxxz]

http://www.r3vlimited.com/board/showthread.php?t=100950

/thread

[M3 euro ltw]

Brief summary EWS II in OBD-II cars

DME's are assigned a unique ISN #. This is coded on the DME. AFAIK it stays with the DME, and can not be changed easily.

EWS large cigarette sized box has 10 keys with unique codes hard programmed into it from factory. They can be turned on and off. Off if one is lost prevents theft.

The same module has a blank re-flashable location on it for a ISN #. This is intended to be changed or re-flashed as needed.

The key antenna/charger is not unique to the system, and can be from any car. When a key is placed in the ring, it is "charged", and sends back a week signal, analogue, that represents its unique key #.

This is sent to the small matchbook transmitter/A-D converter that is black. It converts to a digital version of the key's ID, and sends this on to the EWS large module. It is either a valid key or not. (could prevent start).

Then, the EWS module quiries the DME that runs the engine, and sees what ISN is hard coded onto the DME. If it does not match the one flashed onto the EWS board, then the engine will not start.

(I'm not going to even discuss rolling codes, but that goes on too)

So, with proper diagnostic and flashing tools, you can take ANY dme and align it to an EWS box, and its matching set of keys. But the keys are permanently matched to an EWS box, and there are only 10 ever available. You can order a new EWS box for a specific car incidentally, but you'll need the VIN of that car. If you pick up a random EWS box off the floor, you can not trace the VIN from that alone, or, from the key alone.... which is interesting. You might get lucky, read off the ISN that is on it...and compare that to other DME's you've got in hand, and see if it matches one... THEN you would get a VIN off the DME sticker or internal code to see where the EWS box came from.

Lots of fun!

EWS III btw is very similar, but they moved the transmitter/A-D converter onto the large EWS module to save space/modules, so the key ring attaches to a small plug off the EWS module. I had to make a converter for my bench harness to align and work with EWS III... the pin-outs for the module are of course different....but functionally, alignment is handled the same way. Find this on Euro MZ3 coupes/roadsters

(by the way, the guys at TRM have it right, this was not meant as a correction, just shedding further light)

[ethrty]

thanks for that guys you are both a great help! That link above is a God send!

looks like im going to have to buy the key from BMW to get this to work as it seems like my cheapest option. I doubt it but does any third parties make keys with the chips in them or BMW themself the only option? cheers