In order to replace a Trailer Wire Connector, you must first remove the wheel bearings. You need to remove the wheel bearings because the axle is in between the wheel and the hub. The rear axle bolts are then removed and you slide the bracket out from between it and an adjacent frame cross-member.
The 2003 Acura Mdx Trailer Wire Connector Manual, but is also helpful to people who are new to wiring trailers.
The 2003 Acura Mdx Trailer Wire Connector Manual provides a detailed description of wiring a 17-pin connector on the 2003 Acura Mdx.Download here: PDF ebook