2008 Mazda 3-5-Door Key Fob Programming

You can program a remote on this Mazda yourself from the driver's seat — no tools needed.

1. 1Get in, close all doors, then open the driver's door and leave it open.
2. 2Within 24 seconds: insert the key and cycle the ignition ON then OFF three times, leaving the key in. Then close and open the driver's door three times.
3. 3Done right, the doors lock then unlock on their own — you're now in programming mode. If the locks don't cycle, start over.
4. 4Press Unlock twice on the first remote; the locks cycle to confirm. (If this is your only remote, press any button twice again, wait for the locks, then press any button twice once more on the same remote.)
5. 5To add more remotes, press any button twice on the next remote and wait for the locks to cycle; repeat for a third.
6. 6Close the door and test each remote.

Your 2008 Mazda 3-5-Door key fob uses a CR2025 3V lithium coin cell. A fresh one typically lasts 3–5 years.

How to replace the battery

1. 1 Find the seam or small slot on the edge of the remote.
2. 2 Twist a coin or small flathead in the slot to split the case open.
3. 3 Remove the old coin cell and note the + side.
4. 4 Fit the new battery with the + side matching, then close the case.
5. 5 Press a button to confirm the LED lights, then test at the car.