Need C101 Diagrams for 2 cars

[James Crivellone]

Hey guys,

been looking through my ETM and cannot find pinouts.

Does anybody have the Pinout of C101 AND C104 for a 1986 325e

And then a pinout of C101 for a 1991 325i.


Thanks guys, this will make my life easier :)

[rs4pro3]

I'll have them for you in a minute, I've got an 88 325i, and an 87 325e. But will look up yours realy quick.

[rs4pro3]

email sent with the c101's for multiple cars.
Also on the 91 325i, the c104 is run threw the c101
I didn't put the 91 one in there, but the 88 should be pretty close except for some of the SRS stuff. Which you won't be needing

[James Crivellone]

I'll have them for you in a minute, I've got an 88 325i, and an 87 325e. But will look up yours realy quick.

Thanks dude, I think you can see what i'm planning ;)

[James Crivellone]

Got it, should work nicely

Thanks Ely!

[rs4pro3]

James forget about one error, pin 1 is the Alternator warning light and not the oil level as I put.

[James Crivellone]

Okay few questions

so on the 1988 325is (I figure its the same as the 1991 wiring) C101

Pin 7 Start Input, where does that tie into on my 86 325e C101

As well as Pin 14 Speed Output
and pin 15 Pin 85 Unloader Relay.

Also what is pin 20? I see wiring but don't see a description on the 88 325is.

Also on my car, C104 Pin 3, Fuel Rate Input (is that for the MPG gauge?)
and C101 Pin 7 Coil, does that tie into pin 7 Start Input listed above?

Thanks Ely, these are the only final wiring issues I have to overcome for now

[rs4pro3]

ok, Ya Just splice pin 7 to pin 7 on the 2 harnesses, They just call it different things in the ETM
Pin 14 I wouldn't worry about, as I don't think there is any where on the 86 to splice it in
Pin 15 for the unloader relay, The I cars use 3 wires on the starter sometimes instead of 2, You'll want to splice pin 15 to pin 18(black yellow wire for the starter).
And then on the c104
splice pin 3 to pin 8 on the 91's c101(MPG guage in the cluster)

As for pin 20, I've yet to find the function in the ETM, it shows the wire but it dosn't go to anything.

If you have any other questions feel free to ask.