How to Replace the Key Fob Battery in a Cadillac XTS

1. Press the button on the side of the RKE transmitter and pull the key out.
2. Pry the two halves of the transmitter apart with a flat tool at the bottom center, not at the key slot.
3. Remove the old battery without using a metal object.
4. Insert the new CR2032 or equivalent battery on the back housing with the positive side facing down.
5. Align the front and back housing and snap the transmitter together.

• Replace the battery when the DIC displays REPLACE BATTERY IN REMOTE KEY.
• Do not touch the transmitter circuitry; static from your body could damage it.
• To start with a weak battery, place the transmitter in the pocket in the center console storage area.

Source: 2019 Cadillac XTS owner's manual, PDF pages 33, 34. Steps are summarized in our own words (AI-assisted, checked against the cited pages 2026-10-18). Other model years can differ; your manual has the final word.