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post #11 of 14 Old 11th March 2019, 01:22 PM
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Yes, don't get too hung up on the OBC - it's just me listing things to look at but by no means did I mean to laser in on this as the top priority.

The LED light I refer to is by the variable boost control knob in front of the gear stick. If it stays on and steady all is good. If it flashes it's displaying a fault code. If it doesn't light at all I suggest there is a fault.

Getting a spark and fuel to the plugs is important. Fuses, Relays, Crank Trigger?

I'm in Surrey too if you need photos of anything.

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post #12 of 14 Old 13th March 2019, 08:57 PM
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If you hold a flashlight up to the OBC screen, can you see any LCD numbers/letters? (normally the backlighting dies on the screens, not the complete display) If it is completely black and you do not see anything on the screen, I would recommend starting to check fuses in the fuse boxes(under hood and under rear seat). Perhaps one is corroded or dead. It is very possible the vehicle is immobilized due to the OBC being out of commission - DME thinks someone pulled it out/code is enabled. If its been sitting that long, could be some critters got to the wiring or just a relay or fuse or worst case, possible the General Module is wacked.

so much love to little time.......
'93 E34 M5 - Avus Blue/Dove Grey - 18" M-Parallels
Bent & Broken: '93 E34 M5 - Mauritius Blue/Dove Grey - 3.8 cam gears, Conforti chip, SLS-delete Ground Control/Koni suspension, Alpina Softline 18's, Rogue Engineering short shifter, Eisenmann Race exhaust
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post #13 of 14 Old 16th March 2019, 07:13 PM
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Some good info on the OBC can be found here: BMW E34 Website

Most of the E34 and E32 troubleshooting are the same.

E34 Wiring diagram here: Swap the last 2 numbers for your year of manufacture and remember its the base car year not the Alpina year.

Last edited by DaveW; 16th March 2019 at 07:51 PM.
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post #14 of 14 Old 23rd June 2019, 06:59 PM Thread Starter
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Hi All,

Thanks for all the comments, tips, links and hints above. Very much appreciated indeed. Apologies for the radio silence; life has been a bit manic of late and not had time to work on the car until today (I've moved to Cornwall - car still in Surrey!).

Today I can add the following prognosis:

- All fuses are in very good condition (checked within engine bay and under rear bench fuse boxes); fuse wires themselves all look to be intact with only the larger amp rating ones having minor amounts of corrosion on fuse wires/strips themselves (nothing to worry about IMHO). Contacts into the fuse boxes all show almost no corrosion at all, on what looks to be the fuse side and car side contacts. Overall, I'm pleasantly surprised.
- Same statement as above for all the relays, but I have not evaluated the working order of each relay one by one. That said, there were signs that some of the connections/contacts/pins had got hotter than others.
- I've shone a torch (flashlight) on the OBC screen to see whether just the backlight has gone at various stages of ignition, but I cannot see any digital display whatsoever no matter how I hold the light source.


I really do think I'm narrowing in on the OBC; managed to pop the radio out, but ran out of time today to get the OBC out itself in order to check the bulbs. Think I will buy some replacements either way (they are pretty cheap from what I understand?); that way will be a productive session when am next working on the car.

As always, would be good to hear your thoughts?

Thanks and regards,


Last edited by redzuki; 23rd June 2019 at 07:07 PM.
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