OBC E23

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   Hello
I have 1986 728i auto The OBC needs re-setting every time I use the car. I can get hold of an OBC from 1983 735, will it work?
Nigel

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Indian Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 29-March-2009 Status: Offline Points: 78	Post Options Post Reply Quote Indian Report Post Thanks(0) Quote Reply Topic: OBC E23 Posted: 02-November-2009 at 11:52
	Hello I have 1986 728i auto The OBC needs re-setting every time I use the car. I can get hold of an OBC from 1983 735, will it work? Nigel

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M3AG Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II 7 series & e36 m3 registrar! (Madness) Joined: 17-October-2002 Location: Good Old Hertfordshire Status: Offline Points: 1644	Post Options Post Reply Quote M3AG Report Post Thanks(0) Quote Reply Posted: 17-December-2009 at 19:43
	does it go off completely when the ignition is off? If so you have a power supply problem and not an OBC issue.

Indian Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 29-March-2009 Status: Offline Points: 78	Post Options Post Reply Quote Indian Report Post Thanks(0) Quote Reply Posted: 18-December-2009 at 12:08
	Thanks, I think the batteries need changing and may be the reason the break check light comes on and there is nothing wrong. Where would be the best place to this done, electrical/tv engineers?

M3AG Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II 7 series & e36 m3 registrar! (Madness) Joined: 17-October-2002 Location: Good Old Hertfordshire Status: Offline Points: 1644	Post Options Post Reply Quote M3AG Report Post Thanks(0) Quote Reply Posted: 19-December-2009 at 20:23
	check the inline fuse first, you may have an issue with poor connections etc? And also run a check over all the fuses as they do suffer. But I'm not a 100% sure the OBC has batteries as it takes its cues from the sensors and the dash assembly. The only batteris present are the ones in the pcb in the back of the dash. Do all the instruments etc work as they should? As for the brake light check illuminating, try changing both the bulbs, as someone before you may have put replacement bulbs in that may not be using the correct current etc, and this can show as a blown bulb when there in fact is nothing wrong.

Indian Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 29-March-2009 Status: Offline Points: 78	Post Options Post Reply Quote Indian Report Post Thanks(0) Quote Reply Posted: 20-December-2009 at 10:30
	I believe there 2 AA type rechargable batteries behind speedo/rev counter, I think they will have to be re-newed. I assume the instrument panel is similar to E28. The instuments work ok, the fuel never shows more than 1/2 full, but have never filled the tank to the brim as this requires a bank loan. When I start the car the OBC reads --- and two letters, too damn cold to check, push out side temperatute button and it works. I did start the engine with both rear lights removed for minor body repairs. Break check lights come on and push the break pedal and it goes out, nothing wrong with rear lights and has the correct bulbs Will check all fuses etc, thanks.

Indian Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 29-March-2009 Status: Offline Points: 78	Post Options Post Reply Quote Indian Report Post Thanks(0) Quote Reply Posted: 20-December-2009 at 10:36
	Have just rembered, when the ignition is switched on the OBC reads ---UHU

M3AG Members Profile Send Private Message Find Members Posts Add to Buddy List Really Senior Member II 7 series & e36 m3 registrar! (Madness) Joined: 17-October-2002 Location: Good Old Hertfordshire Status: Offline Points: 1644	Post Options Post Reply Quote M3AG Report Post Thanks(0) Quote Reply Posted: 20-December-2009 at 16:40
	have you set the OBC at anytime in your ownership? As that's the default mode upon reconnecting the power supply you're describing. It is more or less identical to the e28, but yes the only batteries present are behind the dash, you'll have to get some new rechargeable items and have them put back in BUT if the dash all works as it should then they're not at fault. The brake check light will always illuminate when the ignition is on until the brake pedal is pressed, and should only come on after that if there is a fault, does it come on any other time? If not then that's fine.

Indian Members Profile Send Private Message Find Members Posts Add to Buddy List Groupie Joined: 29-March-2009 Status: Offline Points: 78	Post Options Post Reply Quote Indian Report Post Thanks(0) Quote Reply Posted: 21-December-2009 at 09:52
	Thanks, It looks like I will have to reset the OBC with the instruction book," If all else fails read the --" It's too damn cold in the garage at present. E23 is only a toy, not an every day car. Have found a good set of alloy wheels with 195 /70/14 tyres, I got the car with 205/70 and it appears to be a little over geared, its only a 2.8 version.