Replace the Key Fob Battery

Reviewed by the Service Reset editor · Updated September 21, 2026 · How we verify

These instructions apply to the Suzuki SX4 Mk1 (EY) 2006-2014.
For other models, please choose your vehicle here.

A weak key battery is the usual reason a first-generation Suzuki SX4 remote stops locking the doors from a distance. Changing the coin cell takes a couple of minutes with a small screwdriver — but the cell size depends on your market and whether the car has keyless start, so check which remote you have first.

Suzuki SX4 keyless remote opened showing the CR2032 coin cell
This SX4 has the keyless-start remote, which takes a CR2032 coin cell (also marked on the board). Standard European remotes use a CR1620 and US three-button transmitters a CR2025.

Which battery you need

  • European standard remote (flip key or fixed-blade remote): CR1620 lithium coin cell.
  • US/Canada standard transmitter (the LOCK / UNLOCK / PANIC three-button fob): CR2025.
  • Keyless-start remote controller (either market — the fob you keep in your pocket for the push-button start): CR2032.
  1. On a flip key, release the metal emergency blade first. Undo the small screw on the back of the remote if fitted.
  2. Put the tip of a flat-blade screwdriver in the slot and gently prise the two case halves apart. Ease the circuit board out of its holder.
  3. Lift out the old cell. Note which way up it sits before removing it.
  4. Fit the new cell — CR1620 (EU), CR2025 (US/Canada) or CR2032 (keyless-start) — with the + face towards the mark shown inside the case. Keep grease and dirt off the board and battery.
  5. Clip the halves back together, refit the board, cover and screw, and slide the metal blade back in.
  6. Check that the doors lock and unlock with the remote. If they do not, the transmitter code may need re-programming.

Frequently asked questions

What battery does the Suzuki SX4 key fob use?
It depends on the version: the European standard remote uses a CR1620, the US/Canadian three-button transmitter uses a CR2025, and the keyless-start remote controller (both markets) uses a CR2032. Match the cell to the one you remove.

Do I have to reprogram the remote after changing the battery?
No. Replacing the cell does not erase the stored code, so the remote works straight away. Re-programming is only needed if the remote still will not operate the locks or you are adding a new one.

The key still starts the car but won’t lock the doors — is it the battery?
Almost certainly. The metal blade and the immobiliser transponder work without remote power, so the car still starts even when the coin cell is flat. A fresh cell of the correct size usually restores the locking.

If the immobiliser or a security light stays on after the battery change, check the exact dashboard warning against the code list on autodtcs.com.

Independent guide — not affiliated with Suzuki. Always follow your official service manual and safety precautions. Read our full disclaimer.

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