1999 E36 323i - OBC Retrofit Problem

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  1. 7 button to 18 button OBC retrofit problem (FIXED) 
    #1
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    billywhizz1984's Car Details
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    Hi Guys. I've just retrofitted the 18 button OBC to my E36 and can't get the fuel consumption to register. I'm pretty competent with auto electrics and I've read everything I can find on the web and have studied the Bentley wiring digrams until I'm cross eyed.

    My car doesnt have check control but all the wiring was there on X1070 and X16. I had to fit the wire to pin 10 of X17 and scotch-locked all the others. I've tested all the wires for continuity. I also have an E36 convertible and have swapped the OBC's over with the same result.

    Logically the MPG calculation is based on amount of fuel used divided by distance. The range button does work and figure goes down so I unlocked the OBC and did test No8. It registers zero km/h when moving so it seems there isn't a signal from the speedo, even though the wiring is spot on. Any ideas?
    Last edited by billywhizz1984; 20-09-2009 at 23:19.
     
     

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    #2
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    Class--'s Car Details
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    I have no idea what wires do what but I am researching the OBC atm and I read some where that a guy had to add two wires that werent in his plug behind the cluster. Sorry I can't remember where I read it but it may give you a direction to look.


    Class--
     
     

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    billywhizz1984 (19-09-2009)

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    Thanks Class--, I think you are referring to pin 21 of X16 but my car already had the correct white/black wire in place.

    I even went out tonight and tested the voltage (static & running) on both my cars to every pin on X1070 & X1071 and they all matched apart from the wire to the petrol gauge because one tank is almost emtpy and the other is almost full. Unless there is another wire somewhere that helps the OBC get the road speed I'm all out of ideas!
     
     

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    I'd say recheck that pin 6 from the OBC white connector is wired correctly to pin 21 on the white dashboard plug. this is what connects the OBC to the petrol gauge so it can determine range. Never mind the colours of the wires, follow the pin numbers
    that help?

    Class--
     
     

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    #5
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    What did you have before you fitted 18 button obc? Was it analogue clock, 7 button, 8 button or 11 button?

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    Model of Car:
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    Thanks for trying Class--

    I spliced a wire direct from pin 6 of X1071 (white OBC plug) into the already existing white/black wire coming from pin 21 of X16 (white dash plug). I've also done a continuity test from pin to pin.

    The Range feature on the OBC works so it is getting a signal from the tank. As the tank empties the Range figure drops accordingly so I'm as conifident as I can be that this element is working.

    The other part of the MPG equation is the miles travelled. When I unlock the OBC and go into Test No 8 the OBC doesn't show the real-time speed in Km/h when I'm driving, yet it does this fine in my Convertible. This tells me that no speedo info is getting through to the OBC.

    According to all the info I've read the speedo data comes from a white/grey wire going to pin 10 of X17 (blue dash plug). This pin was empty on my car so I fitted a wire direct from there to pin 9 of X1071 (white OBC plug). Again I did a continuity test from pin to pin and it is fine...hence my confusion!
     
     

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    I had the 7 button
     
     

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    Ok, after a lot of reading and even more fiddling about under the dash I now have the consumption working. Before I started this epic voyage I went to the breakers and cut the whole wiring loom behind the dash out of the scrap car so I had every wire to hand with the right connectors - this made things a lot easier when trying to keep the wires the same colour so I recommend you do the same.

    Up to this point I had used the Pelican OBC article as my main guide, but this is for an 11 to 18 conversion so there were wires shown as already there that are missing on the 7 button. My Touring doesn't have check control and I didn't want to bother wiring it in.

    The Pelican guide focuses on wiring the new white OBC plug (X1071) and I did everything it said apart from the connection to the stalk. As you can see from the above I checked & re-checked all my wiring to the white OBC plug but after satisfying myself that everything was 100% correct I turned my attention to the wires missing from the black OBC plug.

    My black OBC plug (X1070) already had wires from pin 12 to 18. Pins 2, 3, 4, 5, 8, 10 & 11 seemed to be for the Check Control and chime so I didn’t worry about fitting any of them. That left pins 6 & 9.

    Pin 6 is a Blue/Brown/Yellow wire going to pin 26 of the blue dash plug (X17) This was missing from both the dash & the black OBC plug so I wired it up – Nothing!

    I then turned my attention to the Green/Blue wire at pin 9 which in the Pelican guide and both Bentley diagrams goes to fuse 23. I decided to check if this was wired to the dash in some way so I checked the Bentley 98 Instrument Panel diagram. I then noticed that this wire is spliced into pin 4 of the blue dash plug (X17). Just like the other wire it was missing from both the dash & the black OBC plug so I wired it up – Success! The Consumption & Speed buttons work and Test No8 shows the actual speed in Km/h.

    Finally, here is my wiring guide for a 7 to 18 button OBC conversion (without Check Control) using a 96 OBC in a 99 car. I hope it helps.


    X1070 – Black OBC Plug

    1. Vacant
    2. Vacant
    3. Vacant
    4. Vacant
    5. Vacant
    6. Blue/Brown/Yellow to pin 26 of the blue dash plug (X17) – Not present at either end so I had to fit it to both plugs. I don’t know what this does!
    7. Vacant
    8. Vacant
    9. Green/Blue to pin 4 of the blue dash plug (X17) – Not present at either end so I had to fit it to both plugs. I now believe this carries the speed data.
    10. Vacant
    11. Vacant
    12. Brown/Grey to Outside Temp Sensor – Already present
    13. Black/White to pin 2 of the white dash plug (X16) – Already present
    14. Violet/White to fuse F45 – Already present
    15. Blue/Violet/White to pin 24 of blue dash plug (X17) – Already present
    16. Grey/Red to Interior Lights – Already present
    17. Brown to earth – Already present but moved to pin 13 on white OBC plug (X1071)
    18. Red/Yellow to live – Already present but moved to pin 8 on white OBC plug (X1071)

    X1071 – White OBC Plug

    1. Black/Green to pin 15 of the purple alarm plug (X1659) behind the glove box – Not present at either end so I had to fit it to both plugs. I think you only need to fit this if you want to use the “Code” feature to immobilise your car.
    2. Vacant
    3. Vacant
    4. Brown/Red to indicator stalk – I didn’t have the “OBC cycle” stalk so I removed this wire.
    5. White/Violet to pin 12 of the white dash plug (X16) – Already present at the dash plug so I spliced this. It carries the Body Computer Data
    6. White/Black to pin 21 of the white dash plug (X16) – Already present at the dash plug so I spliced this. It carries the data from the fuel tank
    7. White/Yellow to pin 11 of the white dash plug (X16) – Already present at the dash plug so I spliced this. It carries the Body Computer Data
    8. Red/Yellow to live – Moved from pin 18 on black OBC plug (X1070)
    9. White/Grey to pin 10 of the blue dash plug (X17) – Not present at either end so I had to fit it to both plugs. Judging from my tests this seems to carry throttle position data, not the speedo data.
    10. Vacant
    11. Vacant
    12. Vacant
    13. Brown to earth – Moved from pin 17 on black OBC plug (X1070)
    14. Vacant
    15. Vacant
    16. Vacant
    17. Vacant
    18. Vacant
     
     

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    Class-- (21-09-2009)

  13.  
    #9
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    Glad you got it sorted m8. Maybe post this info in the how too with the title 7button obc - 18 button obc?
    Always good when you get a niggiling lil problem solved
    Well done mate.

    Class--
     
     

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    Diggin' a old thread, i have the same issue but cant solve it, the black obc connector pin 9 to the blue connector pin 4 and still no go, dont know what i am doing wrong..
     
     

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