Diagram for engine wiring harness

[shogun]

This might help, here are the wiring diagrams by built year, E30, E36, E36/5 Compact, E36/7 Z3, E31 https://www.bmwtechinfo.com/etm/data/toc_cd2.pdf

[kventis]

sorry for ressurecting an old thread, but does anyone have that numbered diagram picture backed up somewhere? as i cant view it anymore on that website..

[mspiegle]

Sorry all, my server died last week and I won't be back in town to fix it until Thanksgiving. I'm searching my backups for the image right now so I can repost it. In the mean time, if you goto google images and search for "e36_wiring_harness_numbered", you'll find a crappy small version of the image in their cache. You can barely make out the numbers, so it might be good enough.

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Ok, I found a backup and edited the original post with it.

[ParTee]

All -
I need help...

Putting the M3 back together (98 S54 WITH the Y harness)..

Cannot figure out which connectors plug into 25 or into the manifold underneath.

Thanks,
Adrian

[Chamberlin]

All -
I need help...

Putting the M3 back together (98 S54 WITH the Y harness)..

Cannot figure out which connectors plug into 25 or into the manifold underneath.

Thanks,
Adrian

I'm doing the same thing... My '99 M3 has a motor from '98, and I think the harness is a '98 as well. I also have a spare '97 harness with the "Y" recall adapter cables installed (both my harnesses have this). I'm uninstalling a supercharger, and basically rebuilding all the hacked up plumbing and wiring. I'm almost ready to re-install the manifold. The one thing I can't seem to figure out is the electrical solenoid for the SAP vacuum circuit. I am pretty sure now, that it is #25, which comes off the injector harness. That's why it's tricky to find, because it's on the the injector rail, not in the main loom under the manifold....

SO, is this correct everyone?

Adrian, if it is the SAP vacuum solenoid, it will look like this and have two vacuum lines connected, one from the underside of the manifold, and the other line going to the stainless steel hard line on the front of the motor.

BMW-11741742712-i.JPG

[Chamberlin]

Anyone?

And on a related note, where the heck does the bracket for the SAP vacuum solenoid mount? It can't be very far away from connector 25 I would think.

[shogun]

Wiring changes in case of the emission recall. GROUP 12 12 10 99 Woodcliff Lake, N.J. July 1999 Engine Electrical Product Engineering
This Service Information bulletin supersedes S.I. 12 10 99 dated May 1999 which should be removed and discarded from your S.I. binder. Perform the procedure outlined in this Service Information on all affected vehicles the next time they are in the
shop for maintenance or repairs and on every affected vehicle prior to retail.
SUBJECT: Voluntary Emissions Recall Campaign No. 99E-A01
MODEL: E36 - 323i and 328i with M52 engine produced 6/95 - 12/98
E36 - M3 with S52 engine produced 1/96 - 12/98
E39 - 528i with M52 engine produced 3/96 - 8/98
Z3 - with M52 engine produced 7/96 - 9/98
Z3 - with S52 engine produced 1/98 - 1/99
Situation: BMW of North America, Inc. has initiated a Voluntary Emission-Recall Campaign to correct vehicles that may have a faulty crankshaft position sensor. A customer notification letter will be sent out by May 1999. This action will address the illumination of the "Check Engine" lamp and the following faults being set in the Engine Control Module (ECM/DME):
Fault Code 83 - Crankshaft position sensor
Fault Code 244 - Crankshaft segment timing
Cause: Internal failure of the sensor
Affected Vehicles: This recall involves E36,E39 and Z3 vehicles with M52 and S52 engines which were produced from 6/95 - 1/99.The procedure given in this bulletin must be performed on all affected vehicles identified on DCS. (A copy of the letter which will be sent to all affected customers in a staggered mailing is attached to this S.I.)
In order to determine if a specific vehicle is affected by this Recall , it will be necessary to utilize the "Service Menu" of the DCS (Dealer Communication System). Based on the response of the system, either proceed with the corrective action or take no further action. The Chassis Number Ranges listed below are only for informational purposes and are not to be considered as the only deciding factor.
Model Chassis Number Range
328i/4 AV15000-AV25219
LB10002-LB10479
328iA/4 AV35000-AV65890
LB30004-LB31291
M3 Conv. EC42001-EC43174
M3A Conv. EC38005-EC40502
M3/4 EE05001-EE09665
M3A/4 EE10002-EE14165
M3/2 EY72008-EY81023
328i/2 ET00009-ET08059
328iA/2 ET30015-ET38036
328iC ET60003-ET67400
328iCA ET90006-ET99999
EY85000-EY91136
323i/2 EH40001-EH43356
323iA/2 EH60002-EH63662
323iC EA15000-EA18321
323iCA EM20001-EM23874
528i BV50010-BV56850
528iA BW00026-BW49997
GT90000-GT97785
Z3 LC00020-LC16358
Z3A LB62000-LB63999
LG20000-LG20708
Z3 M coupe LC60010-LC60950
Z3 M roadster LC85002-LC89198
Correction: The crankshaft position sensor needs to be replaced with the same type of sensor that is currently being used on the M52TU engine. Along with replacing the sensor an adapter harness must also be installed in order to supply the sensor with a 12V operating voltage instead of the 5 volts currently being supplied by the DME.
NOTE: SOME VEHICLES LISTED IN DCS MAY ALREADY HAVE THE NEW STYLE SENSOR INSTALLED, FOR THESE VEHICLES A CHECK/VERIFICATION WILL ONLY BE NEEDED.Procedure: The following steps must be followed when replacing the original M52 crankshaft sensor with the new M52TU sensor.
1. Remove the crankshaft position sensor which is located below the starter motor. Remove the Sensor (1) If the sensor currently installed in the vehicle has a connector directly on the sensor which can be disconnected, then the new sensor is already installed. No further action is required and the DCS contact can be closed. Note: Illustration shows location of component with air filter housing and air mass meter removed. It is not necessary to remove these components to perform this repair.
2. The electrical connection of the crankshaft sensor to the engine harness is located below the intake manifold. To access this connector, the cap of the oil filter housing ( should be removed and the oil filter and housing should then be covered to
prevent dirt from getting onto the oil filter.
3. Disconnect the crankshaft position sensor (1) from the engine harness. Note: This illustration shows the plug connectors with the intake manifold removed. It is not necessary to remove the intake manifold in order to gain access to these connectors and complete this repair.
4. Remove the fuel rail cover and unplug the VANOS solenoid valve plug connector (2).
5. Install the new crankshaft position sensor (1) P/N 12 14 1 709 616 and O-ring P/N 12 14 1 748 398.
6. Install adapter harness P/N 12 51 4 592 703. a. Connect (1) to the new crankshaft position sensor. b. Connect (2) to the engine harness connector which was previously connected to the old crankshaft sensor located below the intake manifold. c. Connect (3) to the VANOS solenoid valve located on the VANOS unit. d. Connect (4) to the engine wiring harness connector which previously connected directly to the VANOS solenoid valve.
7. After the adapter harness has been installed secure the harness lead going to the VANOS solenoid valve (1) to the VANOS oil line with 2 cable ties (3). Note: The harness lead going to the VANOS solenoid valve should not be under tension. The harness
lead should be able to move.
Parts Information: Part Number Description Qty.
12 14 1 709 616 Crankshaft position sensor 1
12 51 4 592 703 Adapter harness 1
12 14 1 748 398 O - ring 17x3 1
61 13 1 377 134 Cable tie 2

NOTE: The early style Crankshaft position sensors are no longer available from the Parts Department. Any retailer stock of Part Number 12 14 1 744 492 should be returned to your facing PDC using :
Return code: TEC 36 Order and invoice numbers do not need to be provided. Recall Label Instructions:
After the vehicle has been checked and corrected, obtain a label (SD 92-124) and with a ball point pen print your dealer code (5 digits) on the Recall Completion Label (see illustration). An initial quantity of 100 labels will be sent to all BMW automotive centers. Peel the label from its backing and affix it to the left front strut tower (in the engine compartment) next to the Vehicle Emission Control Label.
For California centers only it is required by the California Code of Regulations that an executed orange "Vehicle Emission Recall - Proof of Correction" certificate (SD92-084, see illustration) be provided to each customer (for vehicles registered in the state of California) once the Recall on their vehicle has been completed.
http://bavarian-board.com/uploads/kb...ion_Sensor.pdf

[ANINO]

HELLO

Does Anybody knows where can I buy a used wiring harness for an 1995 M3 NON EVO engine (286hp) im kind of desperate please help.

Thanks

[grinchxvx]

I'm going to go ahead and assume that since this is an obd2 s52 harness it's pretty much the same as an m52. Thanks a ton for making this btw. I pulled my harness off In a hurry pretty much relying on the fact someone had made one of these :,)

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Also if I'm not feeling too lazy I may document the color wire and pun number for each connector when I get my harness all done for my swap this month

[968reckless]

does #13 attach to the starter on the relay side? kinda confused over here.

[denvercoutu]

#13 goes to fuse box. Thanks to the original poster! This has been a life saver !

[jjc034]

I'm in the process of converting my turbo M52-swapped E30 from obd1 to obd2. Engine is obd2, but my buddy wired up obd1 for simplicity. Now I want to use obd2 for tunability and diagnostics.

A couple questions:
1) What is the fuel control valve? Do I even have one with E30?
2) i have an E30 adapter for one of the fuse/relay twist connectors, but what do I do with the other two?
3) blanking in where the power terminal with the 3 relays go (#13) - would someone help me out?

Thanks,
John

Sent from my SM-G930V using Tapatalk

[jjc034]

Figured it all out. Want to contribute to the 12V power conversation:
- #23 goes to starter #12
- #17 goes to terminal connecting SAP relay
- #16 goes to first green relay

I just taped up the terminal by SAP relay since the E30 fuse box gets power with a different cable.

Sent from my SM-G930V using Tapatalk

[mechanicalzen]

I nominate this thread for most helpful thread of the decade. The CPS recall sub-harness and the fact that BMW didn't design the harness connectors with pokayoke in mind create a huge potential waste of time if you don't label everything before disassembly.

[Josh25]

I don’t know if people are still on this but where does the 2 pin plug in between cylinder1 and 2 on the fuel rail connect to it has a red/wht and a brn/wht

[AJLM34A]

I don’t know if people are still on this but where does the 2 pin plug in between cylinder1 and 2 on the fuel rail connect to it has a red/wht and a brn/wht

It plugs into part #7, the vacuum solenoid for the secondary air pump.
Screen Shot 2021-07-07 at 8.35.18 PM.png

[austin8753]

hi! doing an OBD2 S52 in an e30, as we speak... #3, the X20 connectors - can someone explain what they are and what their functions are? i know what the purpose of the main x20 connector is, but there's two additional that i'm not sure what their purpose is...
one with only 4 wires coming out of it, and a smaller size x20 looking connector, with 8 wires coming out of it. just need to know what each of those connectors do and what their function is.

thanks!

[AJLM34A]

This link is for the factory wiring diagrams. Just look up and 1996+ model year 6 cylinder, and compare the X20 connector for both the E36 and E30. The connectors next to an X20 connector in an ODB2 E36 are for ASC+T and if equipped and automatic transmission.

http://wedophones.com/Manuals/BMW/

[amoujaffar]

Anyone else missing connector #7 which goes to connector #34? Someone may have pruned this harness for some reason.

[Braymond141]

Anyone else missing connector #7 which goes to connector #34? Someone may have pruned this harness for some reason.

You're not missing it, your car originally never came with it. That secondary harness is a campaign recall add-on. I think the sensor changes too as it changes to a different version using lower voltage (someone else can expand on that).

[sirhodjibob]

You might find this video useful:



As stated above, if your car was built after 01/99 you do not need part 12514592703. Speaking of, if you do need one I have one handy

[Evde]

Did you ever figure this out? In the same predicament.

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hi! doing an OBD2 S52 in an e30, as we speak... #3, the X20 connectors - can someone explain what they are and what their functions are? i know what the purpose of the main x20 connector is, but there's two additional that i'm not sure what their purpose is...
one with only 4 wires coming out of it, and a smaller size x20 looking connector, with 8 wires coming out of it. just need to know what each of those connectors do and what their function is.

thanks!