Diagnostic Port Power

[bimerok]

That is wierd that pin 1 was powered. It is Tach. signal isn't it?

Do you still having problems reading the codes? Do you know if you have codes? Perhaps check engine is on?

[Jason89i]

Also, I just found this pinout for diagnostic port and according to it pins which should have power are: 12, 14, and 16.

you forgot to include what year / model that diagram came from. im guessing its off an early 95m3 power supplies were cut due to delay relay, immobilizer, ect.....so please update.

PIN 12 IS NOT POWER......its the charge indicator light. its the BLUE wire that goes from the alternator (through the x20/c101) and goes to your dash......that little battery light that is on your dash.....same wire. please dont go energizing anything without LOOKING at what the function of the wire is AND understanding what it does.

dont want to sound like a jerk, hope you understand....i just hate missinformation getting spread around.

according to the diagram you posted, which matches my harness, it was definitely Pin 1 that had power with the key switched on.

color of wire? amount of voltage?


cheers, jason

[1990m3]

The Peake code reader seems to work now. It worked to reset my oil and inspection lights. It scanned for codes and came up with nothing. I tried it on my m3 and all I got was flashing "E" for error, but it worked fine with a number of other BMW's that I have tried it on. It flashed no codes on my car, although it clearly has some issues right now

[bimerok]

you forgot to include what year / model that diagram came from. im guessing its off an early 95m3 power supplies were cut due to delay relay, immobilizer, ect.....so please update.

PIN 12 IS NOT POWER......its the charge indicator light. its the BLUE wire that goes from the alternator (through the x20/c101) and goes to your dash......that little battery light that is on your dash.....same wire. please dont go energizing anything without LOOKING at what the function of the wire is AND understanding what it does.

dont want to sound like a jerk, hope you understand....i just hate missinformation getting spread around.


color of wire? amount of voltage?


cheers, jason

Jason,
That print out was for 95M3.
I don't think you're a jerk and I'm not trying to missinform anyone. I am trying to find out what is wrong with my diag. plug which is similar to the issue originally discussed here.

I just checked the pins I mention above on my car and for some reason I don't have ignition switch power to pin 16.
If you have any ideas of why it is missing power there or if I can just jump "switchable" voltage there - please share.

Regards,
Leo.

[Jason89i]

I don't have ignition switch power to pin 16.
If you have any ideas of why it is missing power there or if I can just jump "switchable" voltage there - please share.
.

leo - power ("start/run") comes from the 95e36m3 fuse 26 to x20pin22 (grn/wht) to energize the diagnostic port. im guessing at your c101/x20 connector you did not energize pin22 on the x20. e30's have power ("start/run") from fuse 9 to c101pin6 to e30 diagnostic port / e30 o2heater. i have seen the same wire/wire color/function at the c101 for 91m42is, 90i, 88is, 90m, 88m, 86es.....have not checked all the diagrams, but i feel confident that wire did not change through the production years. so.....your e30 c101pin6 (grn/yel or grn/wht) and e36 x20pin22 (grn/wht) are both dangling...........hook em up.

cheers, jason

[bimerok]

Just double checked your recommendation against ETM and hooked it up as you recommended - Diagnostic port is now working fine.

Thanks!