carfobbattery

Toyota FJ Cruiser key fob battery

5 of the 8 model years listed for the Toyota FJ Cruiser have a proven battery. The most common answer is CR2016. Rows below run oldest to newest; a year can appear twice when the car came with more than one kind of key.

  1. 2007Remote (wireless remote control transmitter)

    CR2016

    Owner's manual: manua.ls (checked Nov 1, 2026)

    Manual text: “For replacement, use a CR2016 lithium battery or equivalent.”

    Find CR2016 on Amazon
  2. 2008-2009Key-head remote

    Not confirmed yet

  3. 2010Key-head remote

    Not confirmed yet

  4. 2011-2012Key-head remote

    CR2016

    FCC ID HYQ12BBT

    Two sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 1, 2026)

    Find CR2016 on Amazon
  5. 2013Key-head remote (wireless remote control key)

    CR2016

    FCC ID HYQ12BBT

    Two sites agree: manua.ls and uhs-hardware.com (checked Nov 1, 2026)

    Find CR2016 on Amazon
  6. 2014Key-head remote

    CR2016

    FCC ID HYQ12BBT

    Two sites agree: uhs-hardware.com and bestkeysupply.com (checked Nov 1, 2026)

    Find CR2016 on Amazon

Changing the battery

Separate remote fob

  1. The remote is a small standalone unit. You will not need to touch the ignition key at all.
  2. Look for a screw on the back or a notch on the edge. Remove the screw if present, then twist a coin in the notch to split the case.
  3. Swap the cell or cells, keeping the same side up as the old ones.
  4. Reassemble and test from a short distance.

A CR2016 is 20 mm across and 1.6 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.

Key with remote in the head

  1. The remote electronics sit in the plastic head of the key itself, so there is no separate fob to open.
  2. Find the seam around the head. Twist a coin or small flat screwdriver in the notch at the blade end or side until the halves part.
  3. Inside you may find a small circuit board in a tray. Lift the board out if the cell is underneath, swap the cell with the same side up, and refit the board.
  4. Close the head, check there is no gap, and try the buttons.

A CR2016 is 20 mm across and 1.6 mm thick. CR2032, CR2025 and CR2016 share the same width but not the same thickness, so a swap between them can leave a loose contact or a case that will not close.

If a child might have swallowed a coin cell, treat it as an emergency and get to a hospital right away.

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