battery for obc backup

[sniper_1]

Hello all... I have a 92 525i. My obc has dimmed out to the point that I can no longer see it even at night with the lights on. My 633 csi had this problem when the batteries on the back of the gauge assembley went bad and no longer charged. is there something similar to this on my 92 525i? and if so where can it be located...

[bimmer dot info]

It is just bulbs. There are no batteries.

[sniper_1]

so what would be the problem with the obc?. some of the buttons dont work and the only thing i can do is switch from time to temp and not even in f either. I am working on doing an obc retrofit i have the turnsignal controller and the different obc i just have to get the right mounting piece for it. so there is no battery anywhere for the backup for the obc. The ones on my 633 csi were on the back of the cluster and they were just two double a rechargeable batteries that were sweated onto the board.

[sniper_1]

does anyone know of a remote place that the batteries would be for the obc??

[sniper_1]

no one,,,, wow... ok thanks

[sniper_1]

please close thread

[FirstE34]

wow you're impatient. some people don't hang out online all day..

[sniper_1]

not impatient..... just figured I would go look for it and not wast anyones time ha ha.... no biggy. I just figured if my 633 had batteries like that then my 525 might.....

[bimmer dot info]

http://www.nmia.com/~dgnrg/page_36.htm

[attack eagle]

not impatient..... just figured I would go look for it and not wast anyones time ha ha.... no biggy. I just figured if my 633 had batteries like that then my 525 might.....
:rofl::rofl::rofl:


You were already told it DID NOT HAVE BATTERIES. therefore there is no place they would be.
:rolleyes:

[sniper_1]

Wow.....I was already told........hmmm am I 12.......ok well thanks for the info there bimmer.info.....I appreciate it.... I have replaced the obc with on out of an 94 530. Is there a code plug Ineed to get for this to work fully??

[bimmer dot info]

Should just be plug and play. I dont know of any compatibility problems between the years.
Did your car have the full obc to start with?

[sniper_1]

NO....it only had the obc with date time temp and memo...thats it....... I am in the process of installing the obc with all the opts. I have the turnsignal switch and everything. I installed the obc and the speed is 10 mph off and the gas range doesnt work as well as the distance. I thought I might need a code plug for the back of the obc or maybe it goes on the back of the gauges

[bimmer dot info]

http://www.bmwe34.net/E34main/Upgrade/OBC.htm

Have you tried all of that?

[sniper_1]

I have tried most of it. I havent installed the turn signal remote for the obc yet so maybe that is it. But I havent gotten any errors but this is where it loses me.

The e34's have 2 different types of OBC one for the BMW 518i,520i and a different type for the BMW 525i,530i,535i,540i.
There are two types of OBC but you can fit ANY OBC IV (without the coding plug socket) into a 518 or 520 with a little modification.
I successfully retro-fitted an OBC IV (with GONG and Temp Sensor) into my 1995 520SEi where the OBC DID NOT have the coding plug socket in it and it's fully operational.
All the OBC IV's out of higher spec cars eg.525, 535, etc (without coding plug socket's) are technically dumb on their own as they have no information about the car's engine type, etc.
This means you go to BMW (like i did) and buy a coding plug for £20 (UK).
BMW need to know Year, Model, Petrol or Deisel, Plastic or Metal Fuel Tank so that the coding plug has the correct calculation's for your engine, eg. MPG,etc.
You then take the coding plug apart so your left with a mini PCB. You then open your OBC and solder the mini PCB onto the back of your OBC. It's only 6 pins and is super easy to do.

Does this mean that if you take a computer from an older car that you need the code plug...or that I need one for my car.... I dont know maybe I am just not understanding how it is written