Diagnostic Port Power

[bimerok]

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

Thanks!

[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]

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.

[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

[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

[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?

[1990m3]

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

Pin 11 is empty on my harness. I am not planning on adding a jumper pin to Pin 11, my code reader seems to be working just fine now that 16 has power too

[bimerok]

I ran a jumper to Pin 16 from the harness. Pin 14 always had power on my plug so that wasn't an issue and I didn't hook up Pin 1 (11 according to Jason).

So are you planing on puting another jumper to pin 11?

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

[Jason89i]

I...........and I didn't hook up Pin 1 (11 according to Jason).

phew..... dont know what would happen to the dme /tach if it was energized w/ 12v. pin 1 (black wire) is the engine speed signal from the dme. cheers, jason

[1990m3]

I ran a jumper to Pin 16 from the harness. Pin 14 always had power on my plug so that wasn't an issue and I didn't hook up Pin 1 (11 according to Jason).

[bimerok]

fixed it after testing my friends '95 m3 (I have the same harness)

With the key in the "ON" position Pins 1, 14, 16 should all have power. Once I confirmed that these pins had power on my harness the code reader works. Finally reset my inspection light (after 2 years).

Unfortunately my car is not sending any fault codes, and it still runs like shit. So much for it pointing me in the right direction.

Did you run "jumpers" to the wires corresponding to the above mentioned pins or you fixed something at c101/x20 connection?

I was under the impression that when you connect pin 17 on x20 it should power up Diag. Plug...??? I didn't find any other pins on x20 that would power diagnostic connector.

[Jason89i]

dave - sorry i havent responded until now. just really busy.

With the key in the "ON" position Pins 1, 14, 16 should all have power. .

oops, typo.....should be pins 11, 14, 16.

Look at:

http://wedophones.com/BMWManualsLead.htm

for wiring diagrams

strait off the etm.....chapter 0670.5

diagnostic port pins for ..... lets say a 94 325i. m3's are a little different with getting power (start imobilizer and egs, but you get the idea.)

DIAG PIN1 blk - TACH engine speed signal from dme to x20p20 to cluster.
DIAG PIN7 wht/grn- S.I. RESET signal to x20p19 to cluster
DIAG PIN11 blk/grn - PWR from ign sw in "run / start" from x20p18 (k7/k5) unloader relays.
DIAG PIN12 blu - CHARGE indicator from alt. to x20p25
DIAG PIN14 red - PWR. hot from battery junction
DIAG PIN15 wht/yel - RXD datalink from dme. also to x20p16
DIAG PIN16 - PWR in run / start from fuse box.
DIAG PIN18 - PROGRAM SELECT from dme
DIAG PIN19 - GROUND
DIAG PIN20 wht/vio - TXD datalink from dme. also to x20p17

cheers, jason

[1990m3]

fixed it after testing my friends '95 m3 (I have the same harness)

With the key in the "ON" position Pins 1, 14, 16 should all have power. Once I confirmed that these pins had power on my harness the code reader works. Finally reset my inspection light (after 2 years).

Unfortunately my car is not sending any fault codes, and it still runs like shit. So much for it pointing me in the right direction.

[bimerok]

Any one?

Any Ideas why diagnostic port has no power?

[1990m3]

I still have the problem, bump