Subaru 2003 Impreza - Manual (Page 279)

IMPREZA(NA) A1850BE-A (ENGLISH)
Driving tips
8-26
Hitch harness connector – Wagon
8. Connect the hitch wire harness’s black four–pin
wire connector to the towing trailer’s wire harness
9. Confirm proper function of the hitch wire harness
by individually activating the brake, right turn signal,
left turn signal, stop, and parking lights on the trailer.
NOTE
Always disconnect the trailer wire harness be-
fore launching or retrieving a watercraft.
J 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 re-
ceiver 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 terminal grease.