How to Replace the Key Fob Battery in a Cadillac STS

Steps from the 2011 Cadillac STS owner's manual.

Push a flat, thin object into the slot on the side of the transmitter to separate it.
Take out the old battery without using a metal object.
Insert the new battery with the positive side facing down, using a CR2032 or equivalent.
Snap the transmitter back together.

Do not touch any of the circuitry on the transmitter, because static from your body could damage it.
Change the battery when the DIC displays KEY FOB BATTERY LOW.

Source: 2011 Cadillac STS owner's manual, PDF pages 116, 115. 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.

Confirm with your own manual, dipstick or door-jamb label.
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