Mazda CX-3: Owner Maintenance / Key Battery Replacement

Mazda CX-3 (2015-2023) Owner's Manual / Maintenance and Care / Owner Maintenance / Key Battery Replacement

If the buttons on the transmitter are inoperable and the operation indicator light does not flash, the battery may be dead.

Replace with a new battery before the transmitter becomes unusable.


  • Make sure the battery is installed correctly. Battery leakage could occur if it is not installed correctly.
  • When replacing the battery, be careful not to touch any of the internal circuitry and electrical terminals, bend the electrical terminals, or get dirt in the transmitter as the transmitter could be damaged.
  • There is the danger of explosion if the battery is not correctly replaced.
  • Dispose of used batteries according to the following instructions.
    • Insulate the plus and minus terminals of the battery using cellophane or equivalent tape.
    • Never disassemble.
    • Never throw the battery into fire or water.
    • Never deform or crush.
  • Replace only with the same type battery (CR2025 or equivalent).

The following conditions indicate that the battery power is low:

  • The KEY indicator light (green) flashes in the instrument cluster for about 30 seconds after the engine is switched OFF.
  • The system does not operate and the operation indicator light on the transmitter does not flash when the buttons are pressed.
  • The system's operational range is reduced.

Replacing the battery at an Authorized Mazda Dealer, is recommended to prevent damage to the key. If replacing the battery by yourself, follow the instruction.

Replacing the key battery

  1. Press the knob and pull out the auxiliary key.

    Mazda CX-3. Key Battery Replacement

  2.  Twist a tape-wrapped flathead screwdriver in the direction of the arrow and open the cover slightly.

    Mazda CX-3. Key Battery Replacement

  3. Insert the tape-wrapped flathead screwdriver into the gap and slide it in the direction of the arrow.

    Mazda CX-3. Key Battery Replacement

  4. Twist the flathead screwdriver in the direction of the arrow and remove the cover.

    Mazda CX-3. Key Battery Replacement

  5. Remove the battery cap, then remove the battery.

    Mazda CX-3. Key Battery Replacement


    Be careful not to allow the rubber ring shown in the figure to be scratched or damaged.

    If the rubber ring detaches, reattach it before inserting a new battery.

    Mazda CX-3. Key Battery Replacement

  6. Insert a new battery with the positive pole facing up, and then cover the battery with the battery cap.

    Mazda CX-3. Key Battery Replacement

  7. Close the cover.

    Mazda CX-3. Key Battery Replacement

  8. Reinsert the auxiliary key.


    WARNING Wash hands after handling the battery and related accessories: Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm...


    For reasons of proper performance, safety, and better fuel economy, always maintain recommended tire inflation pressures and stay within the recommended load limits and weight distribution...

    Other information:

    Mazda CX-3 (2015-2023) Owner's Manual: Switching to Bluetooth® audio mode

    To listen to music or voice audio recorded to a Bluetooth® audio device, switch to the Bluetooth® audio mode to operate the audio device using the audio system control panel. Any Bluetooth® audio device must be paired to the vehicle's Bluetooth® unit before it can be used...

    Mazda CX-3 (2015-2023) Owner's Manual: Bluetooth® Audio

    Applicable Bluetooth® specification (Recommended) Ver. 2.0 Response profile A2DP (Advanced Audio Distribution Profile) Ver. 1.0 AVRCP (Audio/Video Remote Control Profile) Ver. 1.0/1.3 A2DP is a profile which transmits only audio to the Bluetooth® unit...


    Child-Restraint System Types

    In this owner's manual, explanation of child-restraint systems is provided for the following three types of popular child-restraint systems: infant seat, child seat, booster seat.


    Installation position is determined by the type of child-restraint system. Always read the manufacturer's instructions and this owner's manual carefully. Due to variations in the design of child-restraint systems, vehicle seats and seat belts, all child-restraint systems may not fit all seating positions. Before purchasing a child-restraint system, it should be tested in the specific vehicle seating position (or positions) where it is intended to be used. If a previously purchased child-restraint system does not fit, you may need to purchase a different one that will.

    read more

    Copyright © 2023