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How to Change the Battery in a Lexus Key Fob

Key Fob

If your Lexus key fob isn’t functioning like it used to, it may be time for a Lexus key battery replacement. These batteries can last for 1-2 years, and a low-battery alert will sound in the cabin when the engine is stopped. Other signs that your key battery might be low include:

  1. The proximity detection area for the key becomes smaller
  2. The LED indicator light on the key doesn’t turn on
  3. Smart Access system and/or the push button start doesn’t work

Find out how to change the battery in a Lexus key fob below, and contact Rallye Lexus near Port Washington if you have any questions!



Steps for Lexus Key Battery Replacement

First, you’ll need a flathead screwdriver and a CR2032 lithium battery. Look for the flat round batteries and check that the number matches before purchasing. You can get the correct battery at your local authorized Lexus parts center, or at most hardware stores and electronics stores.

  1. Make sure your hands are completely dry to reduce the risk of battery rust caused by moisture in the keyfob.
  2. Remove the mechanical key that is stored inside the keyfob by pushing the release button on the side of the fob.
  3. Pop open the key fob cover with a flathead screwdriver. If you want to avoid getting scratches on the fob, you can wrap the tip of the screwdriver with tape first.
  4. If there is an electronic key module covering the battery, remove that first, and then pop out the dead battery with the screwdriver.
  5. Place the new battery in with the “+” side facing up. Put the electronic key model back on and snap the key fob cover back in place.

Test the key fob to make sure all buttons are functioning. If it still doesn’t work, bring your key and your vehicle in to the Rallye Lexus service center for additional assistance.

Ways to Reduce Lexus Key Battery Depletion

Did you know there is a battery-saving mode on Lexus key fobs? Here’s how to set it to stop the key from receiving radio waves and therefore draining the battery:

  1. While holding down the LOCK button, press the UNLOCK button twice.
  2. The electronic key indicator will flash four times to confirm that the battery-saving mode is set.
  3. In order to use the smart access system and push-button start again, press any of the key fob buttons.

You can also prolong the life of your key battery by avoiding placing the fob within 3 feet of electrical appliances that produce a magnetic field, including TVs, laptops, cell phones and battery chargers, induction cookers, and table lamps.

Rely on Rallye Lexus for Your Service Needs

If you have any more issues with your key fob or need any other Lexus maintenance, schedule service near Manhasset at the Rallye Lexus service center!

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