c101 and x20 wire diagram (e30 M50 adapter)

[PiercedE30]

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[bimerok]

Hello all.

Can anyone help me with providing BMW Electrical Troubleshooting Manual for 1991 325i and 1995 M3 (S50).

I'm trying to figure out my C101 to X20 connection and I see so many different charts where the best one would still be off just by 1 wire color comparing to my plugs.

I'm not realy good in reading wiring diagrams, but I find BMW Electrical Troubleshooting Manuals the easiest to read, since they have connector name and associated pin indicated on them.

I will appriciate any help from you guys!

[BigD]

very nice....looks a lot like mine. i used some wire wraps instead of taping it up so that if i need to i can pull it apart and make shanges.

Yeah, I was thinking about that but I quadruple checked all the pins and connections before sealing it. All seems right. I had to fix the eta connector. I dunno wtf happened to the car but the brown wire (pin 12) read like 2 kOhms. I pulled the boot, and the brown wire's pin was connected into some gimpy pin holder, shrink wrapped, then wired and shrink wrapped to the pin that was in the holder. Dunno if someone changed it at the factory after fucking up the color or what but that was pathetic. I ripped it out eventually, enlarged the hole a bit as a result, the brown wire with its pin seemed to be in perfect shape, with no measurable resistance, and it snapped in the hole, so I filled it with epoxy and it's now like new. Both sides fit, the pin relationship is right, and all resistances are ~0.

[PiercedE30]

very nice....looks a lot like mine. i used some wire wraps instead of taping it up so that if i need to i can pull it apart and make shanges.

[BigD]

Just finished my adapter. $20 of parts, a few hours of fun work, just need to add connectors for the oil level sender which isn't part of the E36 harness. Made it extra long since I've heard the connection ends up being a little tight, can always loop it if it's too long.

[BigD]

What does that diagnostic plug pin 16 on the E30 harness do? I just made an adapter from a 92 325i body harness and an 87 325e engine harness, following the ORCA instructions (some of my colors didn't match up but I corrected it). They don't mention pin 16. You guys say it's for the diagnostic plug... what for?

The ORCA wiring instructions, with some of the colors changed to what I had:

E30 pin location to the E36 pin location:
#1 blue to #25 blue
#2 blue/white to #2 blue/white (this is a circuit added to the E36)
#3 blank
#4 brown/violet to #12 brown/violet
#5 brown/green to #23 brown/green
#6 green/white to #22 green/white
#7 green to #21 green
#8 blank
#9 blank
#10 blue/yellow to #10 blue/violet (this is a circuit added to the E36)
#11 white/green to #19 white/green
#12 brown to #8 gray
#13 green/violet to #13 green/violet
#14 blank
#15 blank
#16 blank (mine wasn't, black/white - didn't use)
#17 blank
#18 black/yellow to #18 black/yellow
#19 blank
#20 blank

[skatebline]

How much different is the 86 to the 90 one??

[cahomey]

I forgot to post my chart for other people to look at.

Anyway here is my chart I used 6 months ago for my m50tu.

[asubimmer]

anyone want to look over it? please lol

[asubimmer]

after looking a little more I came up w/ this...better or worse?



also does anyone have the pin readout for the m50 plug so I know what pin is #1 etc. I need to know what pins are what on that plug.

[asubimmer]

I found the m42 plug info and I'm tryin to look at the m20 stuff and apply it to the m42 swap. this is what I have got for the m42 right now (if you see something that is wrong please let me know):


I'm not sure what to do with pin #6 and 7 on the m42 side. They are "#6 terminal 15 w/ fuse, #7 terminal 15 w/out fuse". Does anyone know what they should go to on the e36 side? Or even what they are lol.

[triggrhaapi]

So did you get your car running?

I have seen people forget the ground strap. If you did that you will get nothing when you turn the key.

Which ground straps? You mean on the motor itself or on the harness? The motor has the grounds on the coils already, the harness isn't back from the electrician who's doing the work. Clearly if the chassis ground on the harness isn't grounded there's no juice to work with, ditto the coils.

[matt]

So did you get your car running?

I have seen people forget the ground strap. If you did that you will get nothing when you turn the key.

Usually when the large ground strap is missing, the starter solenoid will click but the starter won't turn.

[kylebes1]

So did you get your car running?

I have seen people forget the ground strap. If you did that you will get nothing when you turn the key.

[Jason89i]

typo.....pin 13 to 13 for older cars.