GMC 2017 Canyon Owner's Manual page 278

Safety Chains
Always attach chains between the
vehicle and the trailer. Cross the
safety chains under the tongue of
the trailer to help prevent the tongue
from contacting the road if it
becomes separated from the hitch.
Instructions about safety chains
may be provided by the hitch
manufacturer or by the trailer
manufacturer. Always leave just
enough slack so the combination
can turn. Never allow safety chains
to drag on the ground.
Trailer Brakes
A loaded trailer that weighs more
than 900 kg (2,000 lb) needs to have
its own brake system that is
adequate for the weight of the
trailer. Be sure to read and follow
the instructions for the trailer brakes
so they are installed, adjusted, and
maintained properly.
Trailer Wiring Harness
For vehicles not equipped with
heavy-duty trailering, a harness is
secured underneath the left side of
the vehicle, next to the spare tire.
The harness requires the installation
of a trailer connector, which is
available through your dealer. The
seven-wire harness contains the
following trailer circuits:
Yellow: Left stop/turn signal
Green: Right stop/turn signal
Brown: Taillamps/parking lamps
Black: Ground
Gray: Back-up lamps
Orange: Battery feed
Blue: Trailer brake
To help charge a remote
(non-vehicle) battery, press the Tow/
Haul Mode button on the center
stack. If the trailer is too light for
Tow/Haul Mode, turn on the
headlamps to help charge the
battery.
Driving and Operating
Trailer Brake Control Wiring
Harness
A four-wire harness, without
connector, is secured behind the left
side kick panel. The harness
contains the following circuits:
Red/Green: Battery feed
Black: Ground
White/Blue: Brake signal to
controller
Blue: Trailer Brake power to
trailer connector
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