Perhaps the flasher relay is in the fuse box you've got (they are behind the dash in sierras), in whuch case there shoulkd also be another wire to it (from stalk terminal 49).

The loom diagrams are all completely self contained - they show where the circuits get their powerwhether a permanent feed or switched through the ignition, and there are no "Soldered Joint No. 123456 from Diagram XYZ on page 345". The wiper circuit as show includes the parking (as long as it's a sierra wiper motor and you connect it up as shown), and there are no further components needed to make the wipers work other than those shown.

I hope you've gathered by now that the terminal numbers as they are shown in the diagrams are exactly as they appear on, for example, the stalks themselves.

54 = ignition switched stalk feed for the indicators
H(30) = permanent feed for hazards (so they work with the ignition off)