X20 connector pinout

[joon]

I'm in the process of an S52 auto->manual OBD-I swap and for the sake of completeness I need help on pin #18 on the round X20 connector.. this is the info I've compiled so far looking through various ETM's

Please correct me if I'm wrong.. hopefully this info might be of help to someone else doing the swap.. please chime in if you know the pinouts.. thanks a lot guys! :)

Pin number (??? = unsure)
1. - not used
2. - not used
3. EGS -> OBC (auto trans), Blank in my case
4. AC compressor relay +12V IG1
5. AC pressure switch
6. Integrated climate control ???
7. OBD -> DME
8. Check engine light
9. - not used
10. Reverse light switch -> reverse lights
11. Cluster -> ECT
12. ECT -> Cluster
13. Fuel pump relay +12V IG1
14. DME -> Cluster ???
15. OBC/Climate/Multifunction Clock ???
16. Data Link RXD
17. Data Link TXD
18. ???
19. Data Link
20. Data Link (speed signal) ???
21. Ignition switch -> DME Power +12V IG1
22. Reverse lights power +12V IG1
23. Oil pressure switch
24. Fuel economy meter
25. Data Link (alternator) ???

[jvit27]

This is from a 98 M3. Hope it helps

Pin6 - AC #19 DME
Pin15 - Power to #8 OBC
Pin18 - #1 EWS to Starter
Pin25 - #6 IKE

[joon]

This is from a 98 M3. Hope it helps

Pin6 - AC #19 DME
Pin15 - Power to #8 OBC
Pin18 - #1 EWS to Starter
Pin25 - #6 IKE
that certainly helps... thank you! :D

the X20 pinouts should be the same for OBD-I/OBD-II since the guys who do the OBDII->I conversion simply swap out the engine harness