Start at
Sheet 8, C-3 in the
Body, 12 Volt Wiring Diagram. There you'll see the Bedroom Lavatory Rope Lamp which gets it ground from
NE and power from
PK. These wires go back to a plug in the dresser overhead which takes you to
Sheet 4, B-6. From there they go to another plug in the base of the dresser cabinet which takes us to
Sheet 2, A-16. From there follow
PK to
Sheet 2, A-17, which is the
Rope Lamp Switch you identified, connecting
PK to
JE for power.
If you switch to
Sheet 5, D-2 in the
Body, 12 Volt Wiring Installation diagram you'll see in
Detail EN (note the little oval with
43W in it with signifies the
CABINET-LAVATORY option, according to the key at the lower right) that
PK and
JE are switched together by the center switch of three, labelled
ACCENT. Going back to
Sheet 4, C-4 you'll see that that set of three switches should on the wall next to the sink.
Btw, it looks like there's another rope light which is on the same circuit as the overhead puck lights in the bedroom and is controlled by the lefthand switch in the same set labelled
VALANCE. This rope light may only be present with the
43V CABINET-CHEST OF DRAWERS option, however, since it appears to be along the base of the cabinet (see
Sheet 4, A-3).
You may find it helpful to refer to the
Wiring Identification Guide and the
Wiring Diagram Help as well.