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Car Forum / BMW Cars / May 2007E28 OBC question (where is it!)
My OBC ('85 UK M535i) has been showing PPPP since I bought the car, time and date fns work OK but nothing else. I'm really struggling to find the relay box for the OBC. I can find the bonger and there's a space next to it in the rack under the steering wheel that I suspect is for the module. There's a space under it which has the UK/euro alarm (the one that needs a second door keyhole for the magnetic key!), I initially thought it was the relay module until I realised it had too many connectors. Have tried tracing the wiring but to no avail as yet. I suspect the unit is missing completely. Can anyone tel me where it should be, even those with left hand drive cars!  SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price A thought, I wonder if cars fitted with the BMW alarm had a modified OBC relay box which combined the functions of the alarm and OBC? The OBC box has blanks for other connectors and looks SO similar to the alarm box. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price > My OBC ('85 UK M535i) has been showing PPPP since I bought the car, time > and date fns work OK but nothing else. [quoted text clipped - 12 lines] > Can anyone tel me where it should be, even those with left hand drive > cars! Can't directly help you, as I've never yanked one. But I am wondering why you aren't over in www.mye28.com, where someone is sure to have an answer. You'd love that bunch. -- C.R. Krieger MyE28 Post Whore #3 and Chief Smartass© On May 18, 1:47 pm, John Burns <j...@unixnerd.demon.co.uk> wrote: > My OBC ('85 UK M535i) has been showing PPPP since I bought the car, time > and date fns work OK but nothing else. [quoted text clipped - 12 lines] > Can anyone tel me where it should be, even those with left hand drive > cars! Can't directly help you, as I've never yanked one. But I am wondering why you aren't over in www.mye28.com, where someone is sure to have an answer. You'd love that bunch. -- C.R. Krieger MyE28 Post Whore #3 and Chief Smartass© ----- It's on the inside of the glovebox. Roofside, usually behind a plastic shield/cover. What model E28? If it's a pre-87 528e, there will also be a green box in there for the idle control valve. 87-88 528e had the ICV circuit integrated into the ECU. Bill in Omaha '86 535i Disregard!!! That was for the ECU. The OBC ties into the instrument cluster and the alarm and temp chime. I don't believe there is a relay. The OBC (several types world-wide) has an alarm function though. The coding chip may be defunct. They plug into the rear of the OBC so that one OBC may be used with multiple models. > On May 18, 1:47 pm, John Burns <j...@unixnerd.demon.co.uk> wrote: > > My OBC ('85 UK M535i) has been showing PPPP since I bought the car, time [quoted text clipped - 30 lines] > Bill in Omaha > '86 535i > Disregard!!! That was for the ECU. The OBC ties into the instrument cluster > and the alarm and temp chime. I don't believe there is a relay. The OBC > (several types world-wide) has an alarm function though. The coding chip may > be defunct. They plug into the rear of the OBC so that one OBC may be used > with multiple models. Turned out to be a dead display module, which is the first dead one I've seen! There ARE to types of relay box, one for normal cars and one for those with the factory alarm. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price > > Disregard!!! That was for the ECU. The OBC ties into the instrument cluster > > and the alarm and temp chime. I don't believe there is a relay. The OBC [quoted text clipped - 5 lines] > seen! There ARE to types of relay box, one for normal cars and one for > those with the factory alarm. ----- And there you have it... mine doesn't have the factory alarm. If a working display is needed, I may be able to help. We have a few here (Omaha, NE). Are you sure it's not just a dead lamp? With the key "ON", you can see the working/unlit display with a flashlight (torch). I also have the light module, which slides into the OBC from the side. Just saying for the sake of the uninitiated reader, since I'm sure you already knew this. Bill in Omaha '86 535i (without factory alarm) > And there you have it... mine doesn't have the factory alarm. If a working > display is needed, I may be able to help. We have a few here (Omaha, NE). > Are you sure it's not just a dead lamp? With the key "ON", you can see the > working/unlit display with a flashlight (torch). I also have the light > module, which slides into the OBC from the side. Just saying for the sake of > the uninitiated reader, since I'm sure you already knew this. Lamp was fine, symptom was PPPP on a few of the functions. Most of the online sources seem to say it's a bad relay box, so I was surprised when I had to change the display unit. SignatureWho needs a life when you've got Unix? :-) Email: john@unixnerd.demon.co.uk, John G.Burns B.Eng, Bonny Scotland Web : http://www.unixnerd.demon.co.uk - The Ultimate BMW Homepage! Need Sun or HP Unix kit? http://www.unixnerd.demon.co.uk/unix.html www.Strathspey.co.uk - Quality Binoculars at a Sensible price |
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