Acura MDX Owner's Manual page 317

uuTowing a TraileruTowing Preparation
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Trailer brakes
Recommended for any trailer with a total weight of 1,000 lbs (450 kg) or more:
There are two common types of trailer brakes: surge and electric. Surge brakes are
common for boat trailers, since the brakes will get wet.
If you choose electric brakes, be sure they are electronically actuated. Do not
attempt to attach trailer brakes to your vehicle's hydraulic system, as it will lower
braking effectiveness and create a potential hazard.
The 4-pin gray connector installed in your vehicle has all of the circuits required to
install most electric trailer brake controllers.
Trailer brake controller
connector's terminals:
Electric Brake
(Light Green) (20A)
Ground Stop
(Brown) (Violet)
316
Have a qualified mechanic install your trailer
brake controller following the trailer brake
controller manufacturer's instructions. Failure
Brake
to properly install the trailer brake controller
(Green)
may increase the distance it takes for you to
stop your vehicle when towing a trailer.
1Trailer brakes
The 4-pin gray connector is located under the
instrument panel near the top of the parking brake
pedal.