Subaru 2001 Legacy Owner's Manual page 325

Driving tips
8. Connect the hitch wire harness's black four–pin wire connector to
the towing trailer's wire harness
HB8021BB
9. Confirm proper function of the hitch wire harness by individually
activating the brake, right turn signal, left turn signal, stop, and park-
ing lights on the trailer.
NOTE
Always disconnect the trailer wire harness before launching or
retrieving a watercraft.
B When you do not tow a trailer
D Remove the ball mount from the hitch receiver tube and insert the
receiver cover onto the hitch receiver tube.
D Place the dust cap over the four–pin connector of the hitch wire
harness to protect against possible damage.
D Occasionally lubricate terminals of the four–pin connector using
the terminal grease.
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