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Replacing the Remote Key Battery on a Lexus RX

Model: Lexus RX MK 4, Al20 - Years 2016-2022
Part: Key

Today, you will see step-by-step instructions for disassembling and replacing the battery in the key remote for the Lexus RX, from 2016 to 2021. First, take your remote and start by removing the physical key from inside it; then lever on the slot created to open the remote into two parts, thus accessing the circuit board and the battery, as illustrated in the video. At this point, remove and replace the battery with a new one of the correct type (in this case, a CR 2032 3V); insert it the right way round and reassemble the remote!

Updated on 28 May 2026 by ScegliAuto

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