How to Replace the Key Fob Battery in a Chevrolet Aveo

1. Remove the screw from the back of the cover and open the transmitter cover.
2. Pull the transmitter out of the cover and carefully turn the circle cover of the transmitter unit toward open.
3. Remove the old battery.
4. Insert the new battery with the positive side facing up.
5. Turn the circle cover toward close and put the transmitter unit back in the cover.
6. Put the two halves together, replace the screw, and make sure the cover is on tightly.
7. Test the transmitter operation.

• Replace the battery if the LED on the transmitter does not flash when you press the buttons.
• Use one three-volt, CR1620, or equivalent, type battery.
• Do not touch the circuitry on the transmitter, since static from your body could damage it.

Source: 2011 Chevrolet Aveo owner's manual, PDF page 36. 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.