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Plug and Play Wiring Harness Adapters for S54, M54, M52TU, & More

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    Plug and Play Wiring Harness Adapters for S54, M54, M52TU, & More

    *Updated 6 November 2019*

    I am making plug and play wiring harness adapters for S54, S62, M54, M52TU, M62TU, M62 (9/97+), M42 (E36), M44, M50, S50, M52, and S52 engine swaps. These are to be used with the OEM ECU for your engine and allow seamless integration into your BMW. They are available for all models that have a main C101 or X20 connector including E30, E28, E36, and E34.

    I am the original creator and manufacturer of the plug and play S54, M54, and M52TU adapter harnesses. Others are copies and are commonly made using old corroded connectors and wire harvested from junkyard cars. My harnesses are built from new components, including new genuine BMW connectors*, and they are made using new metric wire that conforms to BMW's ISO 6722 specification that I personally import from Europe. I use the exact size wire specified by BMW for each connection and all of BMW's connectors and pins are specifically designed for metric sized wire. Others do not use the correct size wire, which could be dangerous for your vehicle. All of my harnesses are made by me in Oregon. Rest assured you are not getting a harness made in China or by an unknown person behind the scenes.

    Features for S54, S62, M54, M52TU, M62TU, M62 (9/97+) adapter harnesses:
    -Electronic accelerator pedal connector (excluding M52TU)
    -Coolant temperature sensor connector (for instrument cluster gauge)
    -Fuel pump relay wiring
    -Switch for sport mode (S54 & S62 only) (Upgrade option: Z4 Sport button)
    -OBD2 port for diagnostics (excluding 96+ USA models that already have an OBD2 port)
    -Oil temperature sensor connector (E30 M3 and Euro E36 M3 only)
    -Power for ABS (1990+ E30s)
    -E34 M50 oil level sensor connector (M52TU and M54 only, for E30s & E28s with check control)
    -Splashproof fuse holders
    -Power adapter cable for B+ junction
    -Labeled connectors and detailed instructions
    -Optional: CAN controller (for A/C, check engine light, and other digital outputs)
    -Optional: Secondary air injection pump connector and relay
    -Optional for E36: 20-pin diagnostic port for communication with body control modules (ABS, instrument cluster, etc)

    Features for M50, S50 (US + Euro), S52, M52, M42 (E36), & M44 adapter harnesses:
    -Round C101 and X20 main connectors
    -For models with check control: Wiring for E34 M50 oil level sensor
    -For M52 and S52: Coolant temperature sensor connector (for instrument cluster gauge)
    -Wiring for air conditioning input to ECU for proper engine idling with A/C on (instructions included on how to wire it)
    -Power for ABS (For 1990+ E30’s)
    -Optional: OBD2 port for M52 & S52
    -Optional: Wiring instructions for EWS II

    More information about S54, M54, and M52TU adapter harnesses:
    The adapter harness is intended to be used with an E46 engine harness. They can also be used with a Z3 engine harness if one connector is replaced with the E46 version (or two if the trans/O2 sensor Z3 section is also used) (full instructions are included). Let me know if you will be using an E39 harness as there are differences (two of the connectors are combined into one large single connector on the E39).

    I wire the S54 adapter harness for the North American fuel pump relay (black EKP-Modul) by default. Please let me know if you want it wired for the standard green relay (Euro spec).

    I do not make adapter harnesses for the MSS70 (Z4M) or MS45 ECU. Please make sure your S54 ECU is MSS54 or MSS54HP and your M54 ECU is MS43.

    I make adapter harnesses for left hand drive cars as default, so please let me know if your car is right hand drive. I design them for the ECU to be mounted at the glove box, but the ECU can be mounted on the driver's side as well. If you want to mount your ECU on the right side of the car (e.g. glove box on a LHD car) I recommend using a Z3 engine harness since it reaches farther than a E46 engine harness. That is only for the main engine harness. The transmission/oxygen sensor and ignition coil harnesses from an E46 are plenty long.

    The S62, M62TU, M62 (9/97+) adapter harnesses are to be used with an E39 engine harness.

    A CAN controller can now be pre-wired into the adapter harness. The CAN controller provides A/C compressor control, allows engine to adjust idle with A/C on, and provides programmable digital outputs such as check engine light, an additional aux PWM fan (factory BMW electric fan), engine management light, cruise control, and/or oil level warning light. For additional information see this thread: http://www.r3vlimited.com/board/showthread.php?t=362962

    An ECU flash to disable EWS is required for most of these engines to run in older BMWs such as E30 and E36. I offer a free ECU flash to disable EWS for the S54, S62, and M54 with the purchase of an adapter harness (no cost add-on). An ECU flash is also available for purchase separately. Supported ECUs are MSS54, MSS54HP, MSS52, and MS43. I can also disable fault codes for the SAP and rear oxygen sensors, and remove top speed limiter. Note that for MS43 the entire ECU is rewritten to a stock E46 configuration so any custom tuning will need to be performed again.

    I'm able to offer an Evolve Automotive tune for the S54 with an increase of 14-24 bhp above 5000 rpm (Requires high octane fuel. 98+ for Euro and 93+ for US. More info here). I also have MS43 ECUs with EWS deleted for the M54 available for purchase.

    I also offer an ECU bench flashing harness that allows you to easily flash and tune your ECU yourself. I can make one for MS42, MS43, MSS54, & MSS52 and I can also make one for MS41. Like my other harnesses, it's made from all new components including new connectors from BMW. It includes a fuse for circuit protection and for MS43, MSS54, & MSS52 it also includes a grounding pin for boot mode (for full flash). Just connect it to a 12V power supply of your choice and an appropriate OBD2 USB cable attached to your computer.

    *All connectors are new except those that are no longer available from BMW, which includes the 84 & 85 E30 C101, 84-87 E30 C104, E28 C103, and 96-99 E36 X6031. I often have those connectors in stock, but not always. NLA connectors I have on hand are cleaned to be like new.

    Harness price list (standard configuration):
    -$575 for S54 or S62 wiring adapter harness
    -$550 for M54, M62TU, or M62 (9/97+) wiring adapter harness
    -$525 for M52TU wiring adapter harness
    -$230 for M50, S50, M52, S52, M42 (E36), or M44 wiring adapter harness for E30 (add $50 for OBD2 port for M52, S52, & M44)
    -$100 for Bench Flashing Harness for MS42, MS43, MSS54, & MSS52 ECUs
    -$100 for Bench Flashing Harness for MS41 ECUs

    Options and add-ons:
    -S54, S62, & M54 EWS delete. Free with purchase of adapter harness.
    -$25 for Z3, E39, or E38 pedal potentiometer connector (standard harness comes with connector for electronic pedal and not older pedal with separate potentiometer)
    -$75 for factory Z4 Sport button (for S54 and S62)
    -$25 for Z4 Sport button wiring only (without button) (for S54 and S62)
    -$275 for CAN controller with pre-wired connector on adapter harness (For E36 no additional A/C wiring required for standard configuration. E30 will need some additional wiring for A/C since those wires do not go through the main C101 connector. Includes instruction sheet.)
    -$40 for Secondary air injection pump connector and relay for S54, S62, M54, M52TU, & M62TU (Note that some engine harnesses already include the SAP connector and relay such as the Z3 M54. Check your harness to make sure you need this.)
    -$250 for E36 20-pin diagnostic port for S54, S62, M54, M52TU, & M62TU (Integrated with adapter harness if purchased together. If purchased separate, instructions included for DIY wiring.)
    -$110 for Fuel pump relay for North American S54 & S62 ECU (black EKP-Modul)
    -$20 for Fuel pump relay for M54, M52TU, M62TU, Euro S54, & Euro S62 ECU (standard green relay)
    -$35 for E36 dual coolant temp sensor for instrument cluster gauge
    -$30 for E30 coolant temp sensor for instrument cluster gauge
    -$40 for S14 and Euro S50b30 oil temperature sensor
    -$45 for Euro S50b32 oil temperature sensor

    Contact me if you need specific options not listed, such as extra wires for CAN high & low for Z3 or E46 cluster.

    ECU flash/tune price list:
    -$100 for ECU flash with any of the available options listed here
    -$400 for Evolve Automotive tune (normally 499/~$675)
    -$100 for EWS deleted MS43 ECU for M54

    All prices include shipping within the lower 48 states. I can provide you with a shipping quote for delivery to other areas. I ship worldwide.

    Contact me at eurotrash8@gmail.com.

    Here's a link to my S54 build thread. :) http://www.r3vlimited.com/board/showthread.php?t=237727

    Examples of the adapter harnesses I make:

    S62 for E30 M3:



    S62 for E34 540i with optional CAN controller:



    M54 (E39) for E28:



    S54 for 96+ E36 with optional CAN controller:



    S54 for 96+ E36 with optional CAN controller and 20-pin diagnostic port



    S54 96+ E36 with optional CAN controller, 20-pin diagnostic port, and illuminating Z4 Sport button (with NLA X6031 I'm typically not able to supply):



    S62 for E36 M3 Euro:



    S54 for E30 M3:



    M54 (E39) for 88+ E30:



    S54 for 86-87 325e & 325i/s/c:



    S54 for 88+ E30 (older version):



    M52TU for E30 (91+ 318i/s/c version) (older version):



    S54 for 96-99 E36 (older version):



    S54 for 92-95 E36 (older version):


    Optional illuminating Z4 Sport button:


    S50 for 90-91 325is, with E34 M50 oil level sensor connector and "A/C on" input:


    S50 for 91 318is, with "A/C on" input:


    MS42, MS43, MSS52, & MSS54 ECU bench flashing harness:


    MS41 ECU bench flashing harness:
    Last edited by Andrew325is; 11-06-2019, 08:55 AM.
    Plug and Play Wiring Harness Adapters for S54, S50, M54 and more.

    #2
    Bump for a good service.
    sigpic
    New website releasing soon www.gutenparts.com Guten Parts + Service | Facebook | Twitter
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    levent@gutenparts.com[/email]

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    Ladies:
    1998 E36 m3/4/5 1988 325i 1989 325iT

    Comment


      #3
      Email sent.

      S54B32 swap in progress. Status: Getting There

      Comment


        #4
        Awesome service. What's the core charge if I don't have a harness to provide you with?

        Comment


          #5
          Originally posted by brian52555 View Post
          Awesome service. What's the core charge if I don't have a harness to provide you with?
          I actually don't need a harness from you unless you'd like to have one adapted that will not reach your ECU mounting location. I can provide you with a new Z3 harness for $500. Slightly less for an E46 harness (I just found one for $279 although you can probably do better).
          Last edited by Andrew325is; 01-14-2013, 11:08 AM.
          Plug and Play Wiring Harness Adapters for S54, S50, M54 and more.

          Comment


            #6
            Email sent bud, looking forward to it

            Comment


              #7
              Email sent
              Euro S50 Daily Driver: http://www.r3vlimited.com/board/showthread.php?t=279195

              Comment


                #8
                sweet i will in for s54 just need to organize some stuff

                Comment


                  #9
                  I am really really keen to the idea of an aluminum block m54 in a 2002.

                  Hypothetically speaking, it should be easier?
                  world renown Harry Potter expert
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                  Comment


                    #10
                    ^Yeah an all aluminum, shrick cammed, double vanos, m54 sounds like a better idea than a s50 for my vert.
                    I want a nice set of smoked MHW's (I know, get it line)
                    Free Stuff!!:http://www.r3vlimited.com/board/showthread.php?t=273454

                    Comment


                      #11
                      Just shipped another one. :)
                      Plug and Play Wiring Harness Adapters for S54, S50, M54 and more.

                      Comment


                        #12
                        This is awesome! Thanks! Someday I'll want one of these. Someday...
                        '89 325is S50 Track Montser
                        '04 X5 Daily/Tow Vehicle

                        http://www.avarestoration.com

                        http://www.myspace.com/brendanfiddle


                        Click here if you want to be my zombie slave...

                        http://www.youtube.com/user/Fidhle007

                        Comment


                          #13
                          I want one! Might have to order one before you stop making them.

                          Funny thing is, I don't have an e30 yet :( Planning and still looking at E30M available and don't want to spend over $18k if I don't have too :( LOL

                          Mike

                          Comment


                            #14
                            I just shipped one to Spain. :)
                            Plug and Play Wiring Harness Adapters for S54, S50, M54 and more.

                            Comment


                              #15
                              Sent one to Australia. :)
                              Plug and Play Wiring Harness Adapters for S54, S50, M54 and more.

                              Comment

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