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  1. #1
    Active Member One Ring
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    Manual-tip Engine Wiring Harness Difference

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    Iíve recently obtained an extra engine for my high mileage 2001 S4 6-speed. The extra engine is from a tiptronic S4. Iím planning to clean it up or build it outside of the car and swap it over at some point. Both my car and the extra engine are Hitachi MAF systems. My question is, can I use the wiring harness from the auto engine in my manual car (with my manual ECU)? The idea would be to have this extra engine complete with harness ready to go, to make the swap as easy as possible.

    I understand that my manual engine/ECU doesnít utilize SAI, but can I use the auto harness with the manual ECU and just leave the SAI connectors unconnected? Or does wiring/pinout need to be modified?

  2. #2
    Established Member Three Rings
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    So why wouldn't you just swap the trans and harness out of you original car? Its going to be more work to get the harness to work with it than just swap it.

    Sent from my SM-N950U using Audizine mobile app

  3. #3
    Veteran Member Three Rings
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    Quote Originally Posted by travis_w View Post
    So why wouldn't you just swap the trans and harness out of you original car? Its going to be more work to get the harness to work with it than just swap it.Audizine mobile app
    /thread

  4. #4
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    The harness in the car has 190k miles on it and I can tell it had been repaired in-place a few times. The extra one has less miles and looks to be in pretty good shape.

    If the auto harness doesnít need to be modified, then it would be less work to just use it. I also like the idea of taking the time to inspect it, re-sleeve, and fix any cracked wires while still having a running car.

    Anybody else?

  5. #5
    Registered Member Four Rings
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    '01 S4 Tip '91 200 20VTQA, '01 A6 2.7TA, VW Rabbit GTI truck.
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    Quote Originally Posted by strombomb View Post
    The harness in the car has 190k miles on it and I can tell it had been repaired in-place a few times. The extra one has less miles and looks to be in pretty good shape.

    If the auto harness doesnít need to be modified, then it would be less work to just use it. I also like the idea of taking the time to inspect it, re-sleeve, and fix any cracked wires while still having a running car.

    Anybody else?
    Exactly. I'm interested in hearing what needs to be done to make a Tip harness work since I have three of them.

  6. #6
    Senior Member Four Rings CJ_'s Avatar
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    I can't remember if I used the Tip harness in my manual swap, but Im pretty sure I did.. I think the only difference is the plug that goes to the SAI pump. All of the transmission electronics are controlled through a separate harness

    2001.5 Silver S4 Avant - 6spd swap + BW K04s (Current)
    2001.5 Santorin S4 Sedan - SRM k24 build (Totaled)

    IG: CJ_s4

  7. #7
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    Another thing to consider... I have an m-box ecu in my car, the extra harness w/ ecu is a j-box... the pinouts would have to be the same between the two to be direct swap-able. Does anyone have documents that show the pinouts of the two ecuís to confirm?

  8. #8
    Veteran Member Three Rings m_haiser's Avatar
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    pinouts between B5S4 are all the same, that's why the ecu are interchangeable. hell I have a b5s4 ecu in my c5 allroad all it took was braking off a small plastic tab on the ecu connector thought now I have some boot mode reflashing to to do get the abs light to turn off.
    happy hunting!

  9. #9
    Veteran Member Four Rings blitz2190's Avatar
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    the difference is the sai pump, the auto vacumm pump (both of which can be left disconnected), and the plugs on the transmission which can be very easily swapped as the wires are still the same. just did this for the same reason, a much newer and better shape harness.
    Never argue with an idiot, they'll bring you down to their level and beat you with experience.
    2.7T Swap Wiring Guide (Psst this is a link)
    New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come

  10. #10
    Active Member One Ring
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    Thanks for the info. Can you explain the Ďplugs on the transmissioní more? Do the tips use a different reverse or speed sensor?


    Sent from my iPhone using Audizine

  11. #11
    Veteran Member Four Rings blitz2190's Avatar
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    Take a look here https://www.audizine.com/forum/showt...nsmission-Swap from the neutral switch park on for the harness stuff.
    Never argue with an idiot, they'll bring you down to their level and beat you with experience.
    2.7T Swap Wiring Guide (Psst this is a link)
    New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come

  12. #12
    Registered Member Four Rings
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    Good info Blitz. Thanks.

    It's funny how much we'll cough up for a manual harness when there's a bunch of good Tip harnesses available for way less. I've got three Tip harnesses that are in much better shape than the two 6MT ones I've got.

  13. #13
    Veteran Member Four Rings blitz2190's Avatar
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    Np, if you do what I did and repin the reverse plug, and remove the Sai and vacuum pump wires from the harness you can't tell the difference.
    Never argue with an idiot, they'll bring you down to their level and beat you with experience.
    2.7T Swap Wiring Guide (Psst this is a link)
    New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come

  14. #14
    Active Member One Ring
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    Wow this is great thanks. I thought I read somewhere that the reverse light switch plug on the 01Eís is the same as our injectors? The pic of the switch at ECS sure looks like the injector plug.

    https://www.ecstuning.com/b-genuine-...tch/01e941521/

    If so, I can pick up a junkyard injector plug, wire it in-place of pins 7/8 on the Tiptronic multifunctional switch plug (on my tip harness), and tape off the remaining tip multifunctional switch wires... and be good to go. Link below for pins 7/8 reference:

    https://www.audizine.com/forum/showt...nsmission-Swap




    Sent from my iPhone using Audizine

  15. #15
    Registered User Four Rings Scotty@Advanced's Avatar
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    Depending on the vin there could be a few different plugs which are easily changed. The major difference is the manual harnesses have the reverse light switch circuit whereas the auto harnesses does not. This circuit can be added.

  16. #16
    Established Member Two Rings mp3driver's Avatar
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    2006 VW beetle TDI <--its the wifes!
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    I have done a few 6MT swaps on Tip cars, and all we remove is secondary air pump. Combi valves and such. Its easy to add the reverse to the harness. PM if you need any help.
    2001.5 S4
    6MT Swapped
    Still my Favorite Car!

  17. #17
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    Ok, Iím on-board that all I need to do is add the reverse light circuit to the auto harness.

    In manual/tip swaps I get that one could tap into the f125 connector or run wires into the drivers footwell area (there was a thread that mentioned this). In this case, I think it would be best to tap into the engine harness connectors to simply make the auto harness look like a manual harness (regarding the reverse light circuit)...

    So with that, does anyone know which plugs/pins the 01e reverse light switch is connected to in the manual harness? Iím referring to the plugs/pins which interface to the chassis/interior harness.

    This should be easy to see in a Bentley wiring diagram (I donít have one) or if someone has a manual harness laying around (could check conductivity).

  18. #18
    Established Member Two Rings mp3driver's Avatar
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    Iíll go pick up my friends manual harness and Iíll be able to tell you! Itís just at my house at the moment. Give me a few days. If someone posts the answer in the mean time, that works too.


    Sent from my iPad using Tapatalk
    2001.5 S4
    6MT Swapped
    Still my Favorite Car!

  19. #19
    Active Member One Ring
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    This sounds great, thanks.

  20. #20
    Established Member Two Rings mp3driver's Avatar
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    2006 VW beetle TDI <--its the wifes!
    Location
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    Sent from my iPad using Tapatalk
    2001.5 S4
    6MT Swapped
    Still my Favorite Car!

  21. #21
    Senior Member Four Rings CJ_'s Avatar
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    Quote Originally Posted by Scotty@Advanced View Post
    Depending on the vin there could be a few different plugs which are easily changed. The major difference is the manual harnesses have the reverse light switch circuit whereas the auto harnesses does not. This circuit can be added.
    Quote Originally Posted by mp3driver View Post
    I have done a few 6MT swaps on Tip cars, and all we remove is secondary air pump. Combi valves and such. Its easy to add the reverse to the harness. PM if you need any help.
    Not to get of topic (well sort of), but how do you add the reverse circuit? Thats the only thing still missing from my swap. Just run a harness from the transmission plug and pin into the ecu harness?

    2001.5 Silver S4 Avant - 6spd swap + BW K04s (Current)
    2001.5 Santorin S4 Sedan - SRM k24 build (Totaled)

    IG: CJ_s4

  22. #22
    Veteran Member Three Rings
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    Quote Originally Posted by CJ_ View Post
    Not to get of topic (well sort of), but how do you add the reverse circuit? Thats the only thing still missing from my swap. Just run a harness from the transmission plug and pin into the ecu harness?
    You can cut out the geo reverse pins from the old multi function switch connector from the auto setup and extend them for the reverse lights and add the connector or you can make a harness that just plugs into the 10 pin multi function seitch harness and again run wires over to the reverse switch. I've got a couple of the connectors but blanking on the part number right now.

  23. #23
    Established Member Two Rings mp3driver's Avatar
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    2006 VW beetle TDI <--its the wifes!
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    Quote Originally Posted by CJ_ View Post
    Not to get of topic (well sort of), but how do you add the reverse circuit? Thats the only thing still missing from my swap. Just run a harness from the transmission plug and pin into the ecu harness?
    You buy a connector or if you already have one you run the wires into the ecu plenum and down to the driver foot well. There is a brown connector with a blue with red stripe. You connect there.


    Itís all because I own a B5 and LOVE IT!!!
    2001.5 S4
    6MT Swapped
    Still my Favorite Car!

  24. #24
    Veteran Member Three Rings
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    Quote Originally Posted by mp3driver View Post
    You buy a connector or if you already have one you run the wires into the ecu plenum and down to the driver foot well. There is a brown connector with a blue with red stripe. You connect there.
    The wires exist at the trans. Why would you run more stuff into the car?

    Wiki needs a common sense update.

  25. #25
    Established Member Two Rings mp3driver's Avatar
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    2006 VW beetle TDI <--its the wifes!
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    I made a point to seal and hide the tIp connector and forget ever existed. I have a connector in the ecu box. Makes pulling the motor a snap with out extra connectors under the car. Itís all preference anyways. You already have a harness heading that way as it is. Takes 10 minutes to complete it. There is 2 pin the smaller harness from the tip that will trigger reverse lights though if thatís what you want to use.


    Itís all because I own a B5 and LOVE IT!!!
    2001.5 S4
    6MT Swapped
    Still my Favorite Car!

  26. #26
    Veteran Member Four Rings blitz2190's Avatar
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    2004 A4 1.8T Quattro, 2.7T swap Stage 3 APR 6 speed
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    Quote Originally Posted by Scotty@Advanced View Post
    Depending on the vin there could be a few different plugs which are easily changed. The major difference is the manual harnesses have the reverse light switch circuit whereas the auto harnesses does not. This circuit can be added.
    As mentioned is does have the circuit and you do not have to add any wires, just need to chop the plug off and wire the two for reverse to the correct plug.
    Never argue with an idiot, they'll bring you down to their level and beat you with experience.
    2.7T Swap Wiring Guide (Psst this is a link)
    New Build In progress built 2.7 STK 2004 B6 A4- Thread and pic to come

  27. #27
    Active Member One Ring
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    Some additional info... the below thread would indicate we should be looking at the red/orange and/or the red connector for the pins that connect to the backup light switch. I took a pic of my red/orange connector (from the tip harness) for reference.

    https://www.audizine.com/forum/showt...nic-S4-Vehicle

    IMG_1187.JPG



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