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Aug 5, 2013 | 08:40 AM

#11 (permalink)

onehundred80

Senior Member

Joined: Apr 2006

Posts: 25,432

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From: Ontario

Re: HVAC Fan Regulator Replacement

Quote:

Originally Posted by MMZ_TimeLord

Actually, I have the unit un-potted and found two MOSFETs, a single IC and quite a few SMD discrete components. It could be a PWM, but so far I can not find a datasheet on the component. I also found several BMW forums that had un-potted their failed fan controllers as well. Same component IC and part number. They are clueless as to it's specifics as well and have not been able to create a proper schematic.

I will be tracing all the components and reverse engineering a schematic during the week. More to come... stay tuned!

I did a quick study of the parts you mention, Googled them and now know that I am out of my depth. I did solve my door relay problem and found the SMD that was shot. That is about my limit, I'll leave this to the Time Lord.

For the record can you explain the workings, and include the dash mounted fan speed selector, I'm guessing, again, that this has the resistors in it, true or not?

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