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85 745i OBC issues (archive)
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Posted by Andre on October 27, 2001 at 15:23:19:

Group,
I'm working on getting the backlit LCD display working on the 745i and I'm having some issues. I've replaced the bulbs with Rat Shack 6 volt 25 ma bulbs, the display still does not light up.

I've applied 5 volts to the light board to verify that they do in fact work. I've also check the inputs into the OBC and measured 12 volts. At the light connector inside the OBC, I've read 3.5 volts. Given, that the factory bulbs are 5 volt, 80ma, I've got a large voltage drop, circa 1.5 volts.

Before I start ripping apart the OBC, can someone verify what the voltage should be at the internal light connector?? Are there any common failure modes to the OBC's circuts??
Thanks in advance..

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