Here is the wiring diagram just in case you don't have yet. You need to be certain before buying the DME/EWS. Check the CPS (crank position sensor), if this this is bad, it will stop power into the fuel system. I think it should be read at least 500 ohms. Good luck. Checks all
the relays, there's a relay inside the DME compartment too which energize the fuel pump relay, etc.
http://wedophones.com/Manuals/BMW/19...g%20Manual.pdf