Looking for 2012 5.3 liter E38 Connector Pin Out

[pmkls1]

Dave,

I BELIEVE that you are correct about how the ECM controls the fans and that is why your wiring and test results support your theory. That was how I understood the system to work going by the schematic and my memory. I did have a concern about you being able to find diodes that were rated to support the current that the system carries, but your initial test results indicate that the diodes you are using are adequate. Congrats on your success so far and the pics of your wiring look good ! Those diodes in your pics look like the ones I recall seeing more prominently than the A/C system diodes I dug out of my toolbox. Notice that on top of the diodes you have they have the symbol for a diode on them and the pics I posted earlier had a 1.0 on the top of them. I have a drawer dedicated to relays and fuses that I stripped from fuse blocks that I replaced (which happens quite often) and was sure that I had one. But, I could only find the A/C diodes.