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3-Series (E21, E30) Chat relating to the BMW 3-Series from 1975-1983 and 1984-1991 line. Specific models: BMW 315, BMW 316, BMW 318, BMW 318i, BMW 320/4, BMW 320i, BMW 320/6, BMW 323i, BMW 320i. E30 Family models include: BMW 325e, BMW 325i, BMW 325is, BMW 325ix.

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Old 03-19-2006, 02:32 PM   #1 (permalink)
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OBC Display Dimmed, why?!?!

My display on the OBC in my 1988 325iS has little to no light so that I can barely read it during the day time and cannot see it at all at night. Does anyone know why it would do this or how to fix it?
-James
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Old 03-19-2006, 03:50 PM   #2 (permalink)
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Also, if anyone can answer this, the temperature on the display is at -30 degrees C. So how do I get it to display the correct temperature?
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Old 03-19-2006, 05:59 PM   #3 (permalink)
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hmmmm...I've had both these problems, but not at the same time.

It sounds like the backlight to the OBC is blown. I'll look around for the "how to"---if you can find it before me just google "replacing OBC backlight"--or similar searches....i posted the fix just a few months ago. The backlight is a "light bar" that holds two lights, I've heard of people getting some from radio shack and then soldering them in, but I just bought a new light bar for like $30 (kinda pricey for a couple of small lights!)

MY temp guage went screwy there for a while too...but mine was reading 130 F .... not likely in northern Utah. But I was lucky and after a few weeks the problem fixed itself and it started to display the right temp. I would imagine the ambient temp sensor has gone back (at least thats what every one told me) the sensor is located on the drivers side, very front end of the car. Mine is right under a screw, so it almost looks like two screws. You could try replacing that...I think new sensors run for around $50....

I'll look around for that post about replacing the OBC back light...
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Old 03-19-2006, 06:11 PM   #4 (permalink)
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ok here's a thread that tells how to replace the OBC backlight...I tried a few methods before this one, and I like this one the best...

http://www.bimmerwerkz.com/forum/3-s...tml#post382749


hope that works!
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Old 03-19-2006, 06:46 PM   #5 (permalink)
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thanks a lot. Condition are a little rainy in texas right now but once i can get some clear skies and the piece ill take a look at it. Once again thanks a lot and i hope my thermostat fixes itself.
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