How to Replace a Lexus Key Battery

Written by si kingston
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Lexus have been producing battery-charged keys for their vehicles since the early 1990s. The company has since developed remote control smart keys. To replace the battery in one of the original Lexus integrated keys, unscrew the two covers of the key from one another. To replace a battery in a smart key, you must first remove the battery compartment.

Skill level:

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Things you need

  • Miniature Phillips screwdriver
  • Miniature flathead screwdriver
  • Replacement battery

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  1. 1

    Unscrew the screw in the middle of the key.

  2. 2

    Pry the front cover of the key away from the rear cover with a flathead screwdriver or with your fingernail.

  3. 3

    Remove the black rubber ring from around the top of the battery.

  4. 4

    Pull the old battery out.

  5. 5

    Insert the new battery and replace the rubber ring. Replace the cover and screw it together tightly.

  1. 1

    Pull back the lever on the back of the key with your finger where the mechanical spare key is stored.

  2. 2

    Insert a flathead screwdriver into the opening. Pull the remote transmitter from the casing.

  3. 3

    Remove the battery compartment from the remote transmitter.

  4. 4

    Replace the old battery inside the compartment with a new one. The "+" (plus) side of the battery should be facing up.

  5. 5

    Reinsert the battery into the compartment, then replace the compartment inside the remote transmitter. Put the transmitter back inside the smart key.

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