general module repair

For the past few weeks I have lost power door locks, windows, wipers, sunroof, etc. when the ambient temperature has dropped into the 30's. This morning I had a chance to find out why. I followed the procedure written by Javier(?) and all was well with the grounds and power at the fuses, relays and modules under the rear seat.

I took the general module out of its case and warmed the board with a hairdryer. When I reinstalled it everything worked fine. How do I diagnose what solder joints might be cracked in order to repair it?

Thanks,
Chris

oops.......car is a

1991 535i

solder joints indicated in this pic? Thats what your looking for. any small lines like that usually a complete circle constitute a cracked joint, they are most likely on areas where the relay's are joined to the board since a relay actually shakes and vibrates when actuated which tends to make the crappy solder joints crack http://www.bimmernut.com/%7Ebillr/im...cks%20copy.jpg

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Originally Posted by duckloads

For the past few weeks I have lost power door locks, windows, wipers, sunroof, etc. when the ambient temperature has dropped into the 30's. This morning I had a chance to find out why. I followed the procedure written by Javier(?) and all was well with the grounds and power at the fuses, relays and modules under the rear seat.

I took the general module out of its case and warmed the board with a hairdryer. When I reinstalled it everything worked fine. How do I diagnose what solder joints might be cracked in order to repair it?

Thanks,
Chris

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