DME Wiring for OBD Access

[s54lover]

I am trying to access my DME via OBD connection and I am running into an issue. I have found some conflicting information about how to access. I am building this car and the electrical harness is all custom as I have the new AIM PDM32.

My question is- what pin gives data and write access to the DME? Utilizing WDS, I have the following wired to the DME:

DME
X60001 Pin 7 +12v
X60001 Pin 8 +12v
x60001 Pin 4,5,6 grounded to chassis
X60004 Pin 26 +12v
X60004 pin 32 datalink connection

For the OBD plug I have the following wired:
Pin 1 +12v
Pin 4,5 grounded to chassis
Pin 7 datalink connection to DME x60004 pin 32
Pin 9- RPM signal to x60004 pin 17
Pin 16 +12v


I am getting voltage to the OBD2 pins however using a Schwaben OBD tool it will not turn on. I tried another amazon OBD reader that works on my other e46 and it will show a light as battery power but no DME connection.

doing some searching on this forum I found a wiring diagram for a bench flash harness for the MSS54. See below.





Notice that with the bench flash harness, +12v is being applied to Pin 1, 7,8 on X60001. Looking at WDS, x60001 pin 1 is to the fuel injector relay and pin 3 isnt used in a manual car. only in SMG to the TCU however this shows a K line connection directly to the OBD2 Pin 7.

Can anyone verify the correct wiring to the DME for power and data access from the OBD2 connection? I would appreciate any insight!

[R3Z3N]

This is something I wrote up for E30 S54 swaps, the only difference for you may be how you pull +12v fuse switched:

https://github.com/saildot4k/MSS54-XDFs/blob/master/Engine%20Swap%20XDFs/E30%20S54%20SWAP%20WIRING.pdf