Uploaded May 2020 | Updated September 2026, 8 hours ago
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. Ever have those situations where you're trying to lock/unlock/start your vehicle with your key fob and it doesn't respond? More often than not your key fob has a dead 3 volt lithium coin-cell battery causing the problem. Wireless key fobs use RF (radio frequency) for communication with the vehicle and require a source of power hence the 3 volt battery. When it goes bad it can no longer produce the RF signals your vehicle listens for.
Here I use a Nissan key fob for my LEAF that needs a new battery. First thing is splitting the key fob case open. If your fob has an integrated spare key like this one remove that first. Most fobs have a similar setup where there's a small notch for something like a small flat-bladed screwdriver or spudger to go and help get the case open. Don't be surprised if you mar your key fob in the process; nothing is perfect.
When open, you'll find (most commonly) a CR2032 battery. This is what most key fobs use but yours may be different. Simply remove the coin cell and replace it with a new CR2032 and double-check to ensure the correct polarity. The flat side of a CR2032 is always positive (+) and a marking on your key fob indicates what orientation it needs to be installed in. Simply reassemble the key fob after installing the battery and you're ready to test.
Take the refurbished key fob back yo your vehicle and try out the unlock/lock (and if you have it, start) functions. If they work you've solved the problem. If not then you have two potentially expensive scenarios:
1 - Your key fob is defective possibly due to a bad component on the key fob itself.
2 - The wireless system of your vehicle has issue(s). bad antenna, faulty component(s), no power, etc.
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Like the Facebook page: facebook.com/brian.mausolf
Follow me on Twitter: twitter.com/mausolfb
Visit my Linktree to access my socials and other channels: https://linktr.ee/mausolfb
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. Ever have those situations where you're trying to lock/unlock/start your vehicle with your key fob and it doesn't respond? More often than not your key fob has a dead 3 volt lithium coin-cell battery causing the problem. Wireless key fobs use RF (radio frequency) for communication with the vehicle and require a source of power hence the 3 volt battery. When it goes bad it can no longer produce the RF signals your vehicle listens for.
Here I use a Nissan key fob for my LEAF that needs a new battery. First thing is splitting the key fob case open. If your fob has an integrated spare key like this one remove that first. Most fobs have a similar setup where there's a small notch for something like a small flat-bladed screwdriver or spudger to go and help get the case open. Don't be surprised if you mar your key fob in the process; nothing is perfect.
When open, you'll find (most commonly) a CR2032 battery. This is what most key fobs use but yours may be different. Simply remove the coin cell and replace it with a new CR2032 and double-check to ensure the correct polarity. The flat side of a CR2032 is always positive (+) and a marking on your key fob indicates what orientation it needs to be installed in. Simply reassemble the key fob after installing the battery and you're ready to test.
Take the refurbished key fob back yo your vehicle and try out the unlock/lock (and if you have it, start) functions. If they work you've solved the problem. If not then you have two potentially expensive scenarios:
1 - Your key fob is defective possibly due to a bad component on the key fob itself.
2 - The wireless system of your vehicle has issue(s). bad antenna, faulty component(s), no power, etc.
------------------------
Like the Facebook page: facebook.com/brian.mausolf
Follow me on Twitter: twitter.com/mausolfb
