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Nissan Maxima Key Fob Battery Replacement Guide
How to change a dead battery in the intelligent key fob for an 8th generation 2016, 2017 & 2018 Nissan Maxima.

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2016 Maxima Key Fob
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Back Side of Key Fob
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Slide Release Switch
This automotive maintenance tutorial was specifically written to assist owners of the eighth generation (2016, 2017, 2018 and probably also the 2019 & 2020 model years) Nissan Maxima sports sedan in changing a dead battery in the intelligent or "smart" proximity key fob remote control for the keyless entry system.

Owners of other Nissan or Infiniti vehicles such as the Versa, Altima, Juke, Rogue, Rogue Sport, Murano, Xterra, Pathfinder, Sentra, Cube, Armada, Leaf, Quest, Frontier, 370Z, GT-R, Titan, Kicks, NV, NV200, G25, G37, M35 and M37 may also find these DIY instructions to be helpful.

The compatible replacement "coin" (also known as a "watch" or "button") type battery is part number CR2032 which are available at Walmart, Target, CVS, Walgreens or online at Amazon.

The only tool needed to access and replace the old battery is a small flathead screwdriver.



 
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Release Metal Ignition Key
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Backup Key Removed
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Pry Apart Two Halves
The first step is to turn over the key fob and locate the small black plastic switch or "button" located close to the key ring loop.

Slide the switch to release the emergency / backup metal ignition key that can be used to open the car door or start the engine just in case your key fob battery is too weak.

Set the metal ignition key aside in a safe place.

Carefully Insert a small flathead screwdriver into one of the two small notches between the two halves of the fob near where the metal ignition key used to reside.

Very gently pry apart the two halves.

Try to avoid using excessive force. The front and rear halves of the fob should "pop" apart relatively easily.

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Circuit Board & Battery Holder
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Pry Out Old Battery
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Old Battery Removed
Turn over the two halves of the fob.

You'll see the green plastic circuit board attached to the front half and the battery socket on the back half.

Use your fingernail or the small flathead screwdriver to gently pry out the old battery.



 

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Panasonic CR 2032 3V
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Install New Battery
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New Battery In Socket
The OEM battery was a Panasonic CR2032 3 Volt.

Push a new CR2032 battery into the battery compartment with the "+" positive side facing down and the blank "-" negative side facing up towards you.

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Line Up Front & Back
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Push Together Two Halves
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Snap Together Key Fob
Line up the two halves of the fob.

Gently pop together the two halves of the fob.

Double check to make sure that both halves of the fob are flush together at every edge.

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Slide In Emergency Key
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Key Fob Re-Assembled
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Test New Key Fob Battery
Slide the emergency / backup metal ignition key back into the slot on the back side of the fob.

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

If the new battery is working properly, you should see the parking lights flash, hear the door locks opening or closing and possibly also hear the horn honk depending on your settings.

Please check out all of my 2016-2018 Nissan Maxima DIY Repair & Maintenance Guides.
 

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