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Thread: Diagram for engine wiring harness

  1. #1
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    Diagram for engine wiring harness

    I removed the wiring harness from my engine without making much effort to mark where everything went, and to make matters slightly worse, I ended up buying a newer harness because mine looked like 200Kmi trash. Now that I'm trying to figure out where all the plugs go, I'm finding that there don't appear to be many resources for this. I started marking the obvious ones and looking up wire colors for others, but there's still a few I'm unsure about. I figure if this diagram gets completed, it could be a useful resource.

    Original full-size image (BROKEN 10/11/15) @ http://pix.nauticaltech.com/E36_Info...s_numbered.JPG

    e36_wiring_harness_numbered.jpg

    NOTES:
    • This is a '98 M3 harness with the sub-harness recall (SI 122701000)
    • All wire colors are in pin order (first color is pin 1, second is pin 2, etc)



    1 Round Twist Connector Ignition Coil Rail
    2 Large Round Twist Connector Diagnostic Port
    3 Triple Round Twist Connectors Fuse & Relay Box
    4 Long Connector DME Connector
    5 Double Wire Terminal (In housing/shrink wrap) BRN,BRN/ORG Ground G103: Right Front Strut Tower
    6 Round 4-pin Plug Knock Sensors
    7 Rectangular 3-pin Crank Position Sensor, or sub-harness #34
    8 Rectangular 3-pin Idle Control Valve
    9 Single Wire Terminal ?? Starter ??
    10 Single Wire Terminal ?? Starter ??
    11 Rectangular 3-pin Cam Position Sensor
    12 Single Wire Terminal ?? Starter ??
    13 Double Wire, Single Terminal Terminal next to triple-relays on Fuse & Relay box
    14 Round Twist 4-pin MAF
    15 Single Wire Terminal BRN Ground G103: Right Front Strut Tower
    16 Single Wire Terminal RED ?? Terminal near SAP ??
    17 Single Wire Terminal ?? Terminal near SAP ??
    18 Round Plug 4-pin Front O2 Sensor
    19 Round 4-pin Plug VIO/BRN,BRN/YLW,BRN/GRY, Temperature Sensor (Cylinder Head)
    20 Rectangular 2-pin RED/WHT,YEL/BLU Fuel Control Valve (Under car)
    21 Rectangular 2-pin PCV Valve
    22 2-pin Oval Connector Secondary Air Pump
    23 Single Wire Terminal ?? Terminal near SAP ??
    24 Round Plug 4-pin Front O2 Sensor
    25 Rectangular 2-pin ?? Air Pump Control Valve ??
    26 Rectangular 2-pin Vanos Solenoid (last connector on injector rail)
    27 Single Wire Terminal BLU Alternator
    28 Rectangular 2-pin (1 wire) BRN/GRN Oil Pressure Sensor
    29 Rectangular 2-pin Intake Air Temperature Sensor
    30 Rectangular 3-pin Throttle Position Sensor
    31 Single Wire Terminal RED Starter
    32 Single Wire Terminal RED Alternator
    33 Rectangular 3-pin BRN,YLW,RED/WHT Crank Position Sensor (OBD2 in rear of block)
    34 Rectangular 3-pin (2-wires) YLW,BRN DME Harness #7
    35 Rectangular 2-pin RED/WHT,VIO/GRN VANOS Solenoid
    36 Rectangular 2-pin RED/WHT,VIO/GRN End of fuel injector control rail, #26
    37 Rectangular 2-pin YLW/BLU,GRN/WHT Transmission Reverse Switch
    38 Round Plug 4-pin BRN,BLK,RED/WHT,YLW Rear O2 Sensor (Under car)
    39 Round Plug 4-pin BRN,BLK,RED/WHT,YLW Rear O2 Sensor (Under car)

    (I have at least like 5 more I can populate tomorrow. I left my notes in the garage)
    Last edited by mspiegle; 10-11-2015 at 10:43 AM.
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  2. #2
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    This is actually a great idea...I'm in the process of removing the M52 from my old daily so I probably check most of the harness connections before removal. Having A 3rd column for wire colours would be really handy to go with the image.

    #1 hooks into the SAP. You haven't labelled it, but the long rectangular piece (with 18,24,25,26 on it) is the injector rail connectors. It's obvious but whatever. I *think* 25 is the air pump control valve that is bolted down on the OBD2 manifold.

    5,16,17,23 - might be the terminals that connect to the battery post near the SAP.

    A bunch in that big pile that goes under the manifold (7-11, etc) would probably need wire colours to identify. Lots of those connectors are identical and I ran into the same issue when I did the M50 manifold swap.
    Last edited by Crustashio; 09-12-2013 at 02:37 PM.

  3. #3
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    98 m3, 97 528i
    Wired mine yesterday. Hope this helps. I don't see the 2nd tb or cruise plugs.

    1 Round Twist Connector Coils
    2 Large Round Twist Connector Diagnostic Port
    3 Triple Round Twist Connectors Fuse & Relay Box
    4 Long Connector DME Connector
    5 Single Wire Terminal Ground?
    6 round female Knock sensors
    7 female 3 pin To 34 or cam pos
    8 female 3 pin Icv
    9 Starter
    10 Starter
    11 female 3 pin To 34 or cam pos
    12 Single Wire Terminal Starter
    13 Double Wire, Single Terminal Terminal next to triple-relays on Fuse & Relay box
    14 Round Twist 4-pin MAF
    15
    16 Single Wire Terminal
    17 Single Wire Terminal
    18 Round Plug 4-pin Front O2 Sensor
    19 round male Head temp
    20 Fuel or trans under car?
    21 Rectangular 2-pin Fuel purge evap.
    22
    23
    24 Round Plug 4-pin Front O2 Sensor
    25 Sap solenoid on intake
    26 Rectangular 2-pin To 36
    27 Single Wire Terminal Alternator
    28 1 pin Ofh
    29 2 pin Intake temp
    30 3 pin Tb
    31 Starter to alt
    32 Alt to starter
    33 Rectangular 3-pin Crank Position Sensor (OBD2 in rear of block)
    34 Main harness 7 or 11
    35 female Vanos
    36 male End of rail
    37 Rectangular 2-pin Fuel Control Valve (Under car) or trans
    38 Round Plug 4-pin Rear O2 Sensor (Under car)
    39 Round Plug 4-pin Rear O2 Sensor (Under car)

    (I have at least like 5 more I can populate tomorrow. I left my notes in the garage)[/QUOTE]
    Last edited by JoeH; 09-12-2013 at 11:53 PM.

  4. #4
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    #1 actually goes to the coil pack harness, #22 is the SAP power connector
    S54 swap DME flashing - $100
    S54 swap CAN interface board (for proper A/C & check engine light) - $275
    e36 SAP sim/secondary air pump simulator:
    $75 - standard or $170 - plug & play
    e36 post-cat O2 sims: $115 shipped, plug & play

  5. #5
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    Thanks for all the feedback! I've updated the table quite a bit, but still want to confirm many of these and get the wire colors in. I noticed that in some cases, the Bentley has different wire colors than me! I'm going to reference the official BMW wiring diagrams as well.
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  6. #6
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    http://wedophones.com/BMWManualsLead.htm

    - - - Updated - - -

    20 or 37....plug that goes to transmission (reverse)?
    Last edited by shellback; 09-13-2013 at 01:18 PM.

  7. #7
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    I think 20 is the transmission reverse switch. I'll get that updated and verify the wire colors when I get back to my garage. Thanks!

    Quote Originally Posted by shellback View Post
    http://wedophones.com/BMWManualsLead.htm

    - - - Updated - - -

    20 or 37....plug that goes to transmission (reverse)?
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  8. #8
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    Here's part of the sub-harness mystery (#33-36):

    http://bavarian-board.com/uploads/kb...ion_Sensor.pdf

    The engine I'm working with is from an '00 M Roadster, and my wiring harness is from a '98 M3. I think I might be missing a connector on my wiring harness =/
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  9. #9
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    This is shaping up to be a great visual resource. I can't believe something like this hasn't been done before yet (if it hasn't been - I haven't seen it done).

  10. #10
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    Weird, my 98 harness had the extension and the 99 I picked up had a crank sensor plug on the main harness...

    Pretty sure #37 is the trans reverse. Wires are green and blue w white tracers. Also the torn insulation where the mounting clips were attached to the transmission. That makes #20 the fuel sensor by fuel filter.

  11. #11
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    Quote Originally Posted by Jrrrrrrr View Post
    This is shaping up to be a great visual resource. I can't believe something like this hasn't been done before yet (if it hasn't been - I haven't seen it done).
    I'd like to think so! I tried searching for something just like this, but I wasn't able to find it either.

    Quote Originally Posted by JoeH View Post
    Weird, my 98 harness had the extension and the 99 I picked up had a crank sensor plug on the main harness...

    Pretty sure #37 is the trans reverse. Wires are green and blue w white tracers. Also the torn insulation where the mounting clips were attached to the transmission. That makes #20 the fuel sensor by fuel filter.
    Yes, that tripped me up quite a bit. I'm putting an '00 M Roadster S52 into a '99 M3 chassis with a '98 M3 wiring harness. So far, I've noticed that the oil filter housing in '00 is slightly different and adds an oil temperature sensor that the '98 harness doesn't account for. Also, the sub-harness is in relation to the SI I linked to in my original post. In early 1999, I believe they had integrated the connector into the harness. All cars before then got the sub-harness if the car was brought in for the recall. My old '99 S52 is sitting next to me and the wire harness on it has the updated crank position sensor already integrated. The build date on that car was 02/99.

    You are absolutely correct on the wiring. I reversed those 2. I just verified with the Bentley and the BMW wiring diagrams. I have updated the table with the correct information.

    Thanks!
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  12. #12
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    your harness only has one comp mine has 2 is it because one is for then auto trans computer?

  13. #13
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    Quote Originally Posted by 91318foundation View Post
    your harness only has one comp mine has 2 is it because one is for then auto trans computer?
    That's probably correct. Are you putting an auto-trans harness in a non-auto car? If so, I'm not sure if the harness is wired differently internally. It may not work properly, but it's a wild guess.
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  14. #14
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    major props for you for posting those pics and descriptions! Do you happen to have obd1 M and non-M and obd2 non-M engine harness info? Thanks!

  15. #15
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    Quote Originally Posted by scooper View Post
    major props for you for posting those pics and descriptions! Do you happen to have obd1 M and non-M and obd2 non-M engine harness info? Thanks!
    Thank you sir. Unfortunately, I was only able to document what I had available. I hope someone else sees this, and makes a similar diagram for other harnesses.
    Michael Spiegle
    2006 Triumph Daytona 675 - Leo Vince, Full Titanium Exhaust, BMC Filter, TuneBoy Custom Tuned
    1999 BMW M3 - UUC LTW Flywheel, VAC Oil Pan Baffle, UUC TME, UUC DSSR, Dinan BBTB, MM Differential, Z3 Rack, M50 Manifold, 24# Injectors, 803 MAF, Custom RomRaider Tune

  16. #16
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    Wish more people took the time to post good info like this..

    Side Q: always wondered if o2 sensors (pre or post-catalytic) must be mounted at exact same locations or if they could be swapped/ mounted in opposite locations without issue (having not been unplugged from harness)? For example: if o2 sensor for header A got mounted at header B & vice versa for o2 at header B.

    I did my best not to confuse the two when installing exhaust and headers but I didn't tag them. I haven't had any CEL or issue so I'm guessing I got them back to original locations or if I mixed up header o2's I also mixed up the mid-pipe ones so they still correlate to one another. The only issue I see with that, is then the injectors for 1-3 & 4-6 could be adjusting fuel based on readings for the wrong runners.. Hope that makes sense.
    If the mind can conceive it, & you believe it, you will achieve it. - Napolean Hill
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    1998 Alpine White & 1998 Arctic Silver ///m3/4/5
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  17. #17
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    Quote Originally Posted by hide1 View Post
    The only issue I see with that, is then the injectors for 1-3 & 4-6 could be adjusting fuel based on readings for the wrong runners..
    That is exactly what happens if you mix up the pre-cat sensors. You will quickly get a CEL for adaptation limits.
    S54 swap DME flashing - $100
    S54 swap CAN interface board (for proper A/C & check engine light) - $275
    e36 SAP sim/secondary air pump simulator:
    $75 - standard or $170 - plug & play
    e36 post-cat O2 sims: $115 shipped, plug & play

  18. #18
    NeilM is offline Member BMW E36 M3 Expert
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    Quote Originally Posted by gpeterson View Post
    That is exactly what happens if you mix up the pre-cat sensors. You will quickly get a CEL for adaptation limits.
    Oh yeah, BTDT! Every time I cleared adaptation the engine ran great, then as I drove it got rapidly worse and worse. I felt really stupid once the problem was found for me.

    It's slightly counter-intuitive, but everybody needs to learn that the forward O2 sensor connector on the head is for the rear cylinder bank (4-6), and vice-versa. When you look at the cable routing down to the O2 sensors this makes sense, since otherwise each sensor would require a different cable length.

    Neil

  19. #19
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    I love you all so much for this.

  20. #20
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    Good info fellas^ lol. I tend to work slower than most just so I don't make mistakes like this. It is VERY counterintuitive how the front o2 harness would correlate to the back cylinders (4-6), and back harness for the fronts (1-3). I think this is where I struggled for a bit and had to hand trace each harness to be sure.
    If the mind can conceive it, & you believe it, you will achieve it. - Napolean Hill
    -------------------------------------------------------------------------------------------------------------------------------
    1998 Alpine White & 1998 Arctic Silver ///m3/4/5
    JC Intake - ASC Delete - Dinan TB - Flow Matched 21.5# Injectors - JC Tune - SS Euro Reps (modified to retain SAP) - z3m ssk - Eisenmann Race 76mm - Yokohama Advan S2 - Squared LTW's - FK Silverline +X - Rogue FCAB/ RTAB/ RSM/ TM - X-Brace - CDV Delete -Racing Dynamics F&R Strut Braces - NGK BKR6E- German Castrol 0w-40

  21. #21
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    Quote Originally Posted by mspiegle View Post
    That's probably correct. Are you putting an auto-trans harness in a non-auto car? If so, I'm not sure if the harness is wired differently internally. It may not work properly, but it's a wild guess.
    Yea i got it figured out i actually traced all of the wires from the egs computer and removed them. There are only 3 that tie into the dme and 1 was a ground the other 2 were just for communication the rest went to the second x20 plug which i removed anyway. Currently im trying to find the proper crimper so that i can install my c101 connector on the harness. Ordered all the pins and the connector from bmw for about $30. But again thanks for this posting its gonna help when i put the harness back on the engine

  22. #22
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    Bump, because this thread is useful.

    It could be even more useful if the relays were labelled, and some of the question marks were resolved.

  23. #23
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    Can someone please identify the colors of the IAT sensor. This is on my OBD2 wiring harness. I have several wires that are cut but the only 2 wire I have is red/white and yellow/green. On my OBD1 wiring harness that I have laying around, it looks like white and brown. Thanks guys!

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  25. #25
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    Is this diagram missing the connection for the secondary throttle on ASC cars?
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