Mazda CX-3: Owner Maintenance / Key Battery Replacement

Mazda CX-3 (2015-2024) 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.

CAUTION

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

Press the knob and pull out the auxiliary key.
Twist a tape-wrapped flathead screwdriver in the direction of the arrow and open the cover slightly.
Insert the tape-wrapped flathead screwdriver into the gap and slide it in the direction of the arrow.
Twist the flathead screwdriver in the direction of the arrow and remove the cover.
Remove the battery cap, then remove the battery.

CAUTION

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.
Insert a new battery with the positive pole facing up, and then cover the battery with the battery cap.
Close the cover.
Reinsert the auxiliary key.

Battery

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...

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Other information:

Mazda CX-3 (2015-2024) Owner's Manual: Operational Range

The system operates only when the driver is in the vehicle or within operational range while the key is being carried. NOTE When the battery power is low, or in places where there are high-intensity radio waves or noise, the operational range may become narrower or the system may not operate...

Mazda CX-3 (2015-2024) Owner's Manual: Inspecting Engine Oil Level

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