(by "service manual" i'm referring to the 2006 manual available here:
http://diysprinter.co.uk/reference/2006-VA-SM.pdf ,
section 8W-35 for the ABS system
J16 is what i've been calling a splice .. in the 2006 service manual it will be a dot with an "S" as the first character
Since your drawing identifies it as "circuit 30", it's always-powered battery +12v.
I think it's Splice S100 on page 8w-35-5 (based upon brake controller pin numbers)
(but if the fuses have power, it's OK) S100 is under the driver's seat.
The "W" numbers are ground points. W27 goes to connector pin 5, so that's G302 in the service manual.
Manual section 8W-91 has *locator maps* for the splices and grounds.
G302 and G100 are near driver's side headlight
--dick