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Before you do anything, get the codes read.
For voltage readings, you click the dropbox link that shows you a picture of the BCM connector. You measure the 10 voltages between the 10 pin pairs and record them to XX.XX accuracy. You don't unplug it. The picture is the back of the plug.
Again, here are the pins:
14-6
6-13
13-4
4-12
1-7
7-2
2-8
8-3
3-9
9-10
As you can see, in all but one case, the 1st pin is the 2nd pin of the group above. You can take measurements by moving the probe from the first pin of the top line to the second pin of the next line... this is what I meant by "walking the probe". Your polarity will flip flop between readings, but that doesn't matter.
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