OK, just to update. Apologies for not doing so until now. I basically put in a push to make switch on the Pin 3 of the connector A that wasn't giving the expected reference earth, to a good known ground and fitted it to the dash beside the headlight raise and lower buttons. Works a treat, just have to press the button a couple of times to spray the screen and as my wipe cycle works anyway that solves works around the problem.
Cheers again for your assistance
Cheers again for your assistance
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