Owner's of other Honda or Acura vehicles such as the Odyssey, Insight, Ridgeline, CR-V, Fit, Civic, CR-Z, Crosstour, Accord, MDX, RDX, RLX, TL, TSX and ILX may also find these DIY instructions to be helpful.

A replacement coin cell (A.K.A. "button" or "watch") battery is part number CR1616 which is available from various manufacturers such as Panasonic, Sony, GE, Duracell, Energizer and Maxell.

The only tool needed to access and replace the battery is a small #0 Phillips head screwdriver.

So make sure you use a small #0 screwdriver such as from a jeweler's screwdriver set or a computer repair kit.

Carefully loosen the screw in the counterclockwise direction while applying downward pressure to prevent from having it strip.

Set the screw aside in a safe place.

Swing open the back cover of the fob at the edge closest to the metal ignition key.

Gently remove the plastic hook and set the back cover aside in a safe place.

Lift the remote control unit out of the front cover of the key fob.

Open the remote control unit to access the old battery.

Gently pry out the old battery from the socket with your finger nail or a small flathead screwdriver.

Try to avoid bending or damaging the metal electrical contacts.

Re-insert the plastic hook at the bottom of the key fob cover back in to place.

Re-insert the Phillips head screw and tighten it in the clockwise direction until it is snug.

Try to avoid over tightening the screw to prevent from stripping it or cracking the plastic key fob housing.

To test the new battery, stand near your Pilot and press the "Unlock" and "Lock" buttons.

If the new battery is working properly, you should see the parking lights flash and hear the door locks open or close.

Be sure to record the battery change in your vehicle's service records.

For more, please check out my other 2009-2015 Honda Pilot DIY Repair & Maintenance Guides.