Bobzilla, thanks so much for this info. I am new at reading schematics so I'm a little slow. This will help me track this down. With a splice such as S127 is it a matter of following the wire to the splice? I'm assuming the splice could be anywhere along the harness, correct? Also, do you think the center pin is grounded through the harness, pdc, or pcm independent of the outside pins? Thanks a bunch!