Honda PILOT 2021 Owner's Manual page 518

uuTowing a TraileruTowing Preparation
Electric Brake
(Brown)
+B (20A)
(Blue)
Ground
(Black)
Brake Lights
(Sky Blue)
516
The trailer hitch harness is used to install the
controller for the electric trailer brakes.
Insert the trailer brake fuse into the engine
compartment sub fuse box.
2 Engine Compartment Fuse Box Type B
P. 704