How to Replace the Key Fob Battery in a Cadillac DTS

1. Push a flat, thin object into the notch above the metal base to separate the transmitter.
2. Take out the old battery without using a metal object.
3. Insert the new CR2032 or equivalent battery with the positive side facing up.
4. Put the transmitter back together.

• Replace the battery when the REPLACE BATTERY IN REMOTE KEY message shows in the DIC.
• Do not touch the circuitry on the transmitter, since static from your body could damage it.

Source: 2011 Cadillac DTS owner's manual, PDF page 108. 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.