Owners of other Acura or Honda vehicles such as the RDX, ILX, TLX, RLX, TL, CL, RSX, RL, TSX, ZDX, NSX, Integra, Pilot, Accord, Civic, Fit, Clarity, CR-V, CR-Z, HR-V, Odyssey, Element  and Ridgeline may also find these DIY instructions to be helpful.

The OEM part number for the complete rear window wiper arm and wiper blade assembly is Acura 76740-S3V-A04.

The tools needed to remove the old wiper arm include a 10mm socket and a 1/4" drive ratchet.

You may also need some penetrating oil spray and a rubber mallet to loosen the old wiper arm from a rusted mounting bolt.

Set the base cap aside in a safe place.

Loosen the single nut on the base of the wiper arm by turning it counterclockwise with a 10mm socket and a 1/4" drive ratchet.

It will most likely be stuck to the mounting bolt by some corrosion (rust) from years of being exposed to rain and snow.

Spray some penetrating oil such as PB Blaster, Liquid Wrench, Kano Kroil or WD-40 on to the exposed bolt end.

Hold a paper towel under the base of the wiper arm to protect the paint and glass from the spray.

Allow the penetrating oil to work its way into the threads for at least five to ten minutes.

You may also choose to gently tap on the bolt with a rubber mallet to help loosen the wiper arm from the corroded threads.

If necessary, you could also gently move the wiper arm up (towards the top of the window) and slightly down (towards the license plate) to loosen it from the threads.

If you have a wire brush, gently clean off any rust or debris from the splines on the mount or the threads on the bolt end.

Carefully push the base of the new wiper arm over the threaded bolt and on to the splines.

If the wiper blade holder does not look parallel (lined up with) the bottom of the window, pull it off and try to push it on again.

The wiper arm should not be touching the painted metal tailgate panel or rest more than about an inch above the bottom edge of the glass.

Spin on the 10mm nut a few turns by hand in the clockwise direction to prevent it from becoming cross threaded.

Tighten the 10mm nut with the socket and 1/4" drive ratchet until it is snug.

Avoid over tightening the nut to prevent from stripping the threads or damaging the base of the metal wiper arm.

Gently snap the base cap back into place.

For the best wiper performance, thoroughly clean off the back window and apply a glass treatment product that will repel water such as Rain-X.

If you would like to just replace the insert, here is the Acura MDX Rear Wiper Blade Rubber Refill Installation Guide.

For more, please check out all of my 2001-2006 Acura MDX DIY Repair & Maintenance Guides.