I figured out the wiring which should apply to other w126 climate controls:

1. black/violet
2. brown
3. black/white
4. black/yellow/blue
5. black/green
6. black/yellow/red
7. brown/blue
8. yellow
9. brown/black
10. black/red/violet
11. blue/violet
12. black/red (double wire)

I sincerely hope this never happens to anyone else as this is a seriously tedious troubleshooting proccess. Then again, it is the climate control--I shouldn't expect any different.

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1999 E320 4matic really nice Wagon 135k
1981 300TD loud, rattling family car 180k (TGI sold!)
1985 500SEL gas guzzler 220k (sold)
1978 300D my first Turtlediesel (sold)437k