Oh, forgot to mention - to answer your Q2 - the rear door "woofer" speakers are on the first connector on your list (the 15-pin - X18771) and are labelled "Touring" (dunno why).

X18771, Pin 3 & 11 - Left rear low-range speaker

X18771, Pin 12 & 5 - Right rear low-range speaker

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Wayne
2005 BMW X5 3.0d (b 02/05)
2001 BMW F650GS Dakar (b 06/01)