» Site Navigation | | » Recent Threads | | | | | | | | 02-20-2016, 09:22 AM | #1 | Junior Member Join Date: Feb 2016 Location: Littletown Posts: 18 | Questions on wiring on OBD2 S52 engine bay So I have been searching this forum and others for a wiring diagram to assist me with this swap. I am very novice on the wiring side of things. I had a wiring diagram printed out but now have mis placed it and can't find the thread either. Can anyone out there please help me. I am nearly complete with the motor and wanted to have the engine bay wired before I put the motor in. thanks. | | | 02-28-2016, 07:03 AM | #3 | Junior Member Join Date: Feb 2016 Location: Littletown Posts: 18 | Does anyone have a manual or a chart with the pin#'s and the wire descriptions? These manuals are awesome if you are an electrical engineer. They don't have a sections for the engine twist plugs connecting the engine harness to the fusebox. I am at a standstill on the build, i have to adapt the engine harness from my obd2 s52 M3 to the OBD2 318ti body harness. 4 different wires on the first twist plug, ti has no second twist so 5 different wires there, and the 3rd smaller twist has 4 extra colored wires that aren't in the M3 engine harness. does anyone have a simple Pin# chart with detailed wire descriptions? | | | 02-28-2016, 01:24 PM | #4 | Senior Member Join Date: Nov 2004 Location: Bremerhaven, Germany Posts: 977 | Quote: Originally Posted by Silverfox99 Does anyone have a manual or a chart with the pin#'s and the wire descriptions? These manuals are awesome if you are an electrical engineer. They don't have a sections for the engine twist plugs connecting the engine harness to the fusebox.... | The BMW Electrical Troubleshooting Manuals (ETMs), linked to above, are drafted in a simple, uncluttered style for automotive technicians. Engineering drawings are almost always much more dense packed, and to a layperson, probably much more cryptic. The first couple sections of each manual (0110 and 0140), after the index, explain how to interpret the drawings. (Different automakers have different styles). Sections 7000 and 7100 show component locations. The BMW ETMs are pretty well organized – is just takes a little time to get used to BMW's style. For laughs, I have attached a schematic I was studying a few weeks ago, that helps engineers design in a simple voltage regulator. I only had to understand the bits near and around 2 1/2 sides, to answer the question: just how many pins can I tie to ground? Last edited by John Firestone; 02-28-2016 at 01:46 PM. | | | 02-29-2016, 12:57 AM | #5 | Senior Member Join Date: Nov 2013 Location: Bresse Track France Posts: 535 | hi,maybe this can help you a little | | | 02-29-2016, 10:11 PM | #6 | Junior Member Join Date: Feb 2016 Location: Littletown Posts: 18 | That was very helpful, engine in, wired, have to keep buttoning it up | | | 03-08-2016, 12:12 AM | #7 | Senior Member Join Date: Mar 2008 Location: San Diego Posts: 179 | Silverfox99, Did you sort out the issue? Are your harness and car both OBDII? I am doing an OBDII/OBDII swap and am unclear whether any pin modifications are needed. I have an EVAP valve CEL code but other than that it runs and drives. I thought the only wiring mods needed were for OBDI to OBDII and/or Auto trans chassis. I have not found a definitive answer or pinout diagrams that make it clear. __________________ 98 318ti MSport M52, 88 M3, 97 M3/4 | | | 03-16-2016, 01:35 AM | #8 | Junior Member Join Date: Feb 2016 Location: Pompano beach, Florida Posts: 11 | confused!!:confused::confused: Im doing a 98 m52 swap into 98 318ti, auto box to manual box. as far as i understood and read on forum it should be plug and play. now having an issue with those round connectors by the fuse box here two pictures attached, one (on the left)with less pins is from 98 323is donor ca, the second one( on the right) is from my 318ti..... any ideas????? should i just throw in the motor plug it in and see if it works or should i fix it some how??? | | | 03-16-2016, 05:27 AM | #9 | Senior Member Join Date: Nov 2013 Location: Bresse Track France Posts: 535 | hi roman the bottom plug is for the DME/cluster connection the middle plug for the ABS signal and i don't know for the top plug because we dont have it on European version | | | 03-16-2016, 04:04 PM | #10 | Member Join Date: Jan 2015 Location: Jacksonville Posts: 60 | Quote: Originally Posted by samdemange hi roman the bottom plug is for the DME/cluster connection the middle plug for the ABS signal and i don't know for the top plug because we dont have it on European version | I think the top plug was for auto ECU edit: use this http://www.bimmerforums.com/forum/sh...ht=318ti%20s52 | | | 03-20-2016, 02:43 PM | #11 | Junior Member Join Date: Feb 2016 Location: Pompano beach, Florida Posts: 11 | harness connectors Guys thanks a lot for your answers! It looks like less and less people reading the posts and shearing knowledge about the swaps! I still havent clearly understood what to do with my wiring connector, after you guys told me which one is for, i still have one BIG question remaining -all of tree round connectors have different amount of pins, also they not in the same locations.....!!!???? what is the best way to go? start matching up the wires? or just plug it in the way it is now and hope it works Please if anyone has any idea about my situation here, your help will be highly appreciated!!!!! | | | 04-07-2016, 03:08 PM | #12 | Senior Member Join Date: Mar 2008 Location: San Diego Posts: 179 | PlusOne, Thanks for the input. That is great help! It defines where to look. I think I may have manuals for both that list the pins and signals. Thanks __________________ 98 318ti MSport M52, 88 M3, 97 M3/4 | | | 04-11-2016, 01:54 AM | #13 | Junior Member Join Date: Sep 2014 Location: Reading, PA Posts: 16 | Trusted1 i think your answer is in post 5 by Samdemage It may be you need to move pin 9 from connector x6031 to pin 8 of connector x20 ( you will also find that you are getting a muffler flap error if you read your codes but this doesn't throw a CEL). Its been awhile but I think this what I did to get rid of my canister CEL problemt | | | 04-11-2016, 04:38 PM | #14 | Senior Member Join Date: Mar 2008 Location: San Diego Posts: 179 | PlusOne, Thanks for the input, that looks like a good call. I spent time on the manuals this weekend detailing the X20 & X6031 pin outs on both the 318ti and the 323i. Along with this issue, I am hoping that with the right connections, the 318ti ASC maybe could be made to function. RealOEM has a different front cabin harness listed for the 323ti but I have not found an electrical troubleshooting manual for that model to confirm what the differences in the harnesses are. Do you recall if you just cut and soldered or if you used a tool to remove and replace the sockets/pins in the connectors? If I am going to try to make the connections the ABS/ASC module is looking for, I will need to add the "missing" wires or splice in the 318ti X20 connector since it looks like the CAN bus signals use pins 1 & 2 that are missing from the M52 harness. Thanks __________________ 98 318ti MSport M52, 88 M3, 97 M3/4 | | | 04-12-2016, 03:15 AM | #15 | Junior Member Join Date: Sep 2014 Location: Reading, PA Posts: 16 | I removed the pin and transferred it to the other connector. If i recall it was fairly easy. There is a plastic retaining/locking ring on the face of the connector. You twist this slightly ccw to unlock the pins. You can then pull them out of the housing. search for x20 pin removal and you should get some hits on how this is done. | | | | | Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | | Posting Rules | You may not post new threads You may not post replies You may not post attachments You may not edit your posts HTML code is Off | | | |