Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Card Key Battery Replacement [Advanced Keyless System]
2009 Mazda CX-9 FWD V6-3.7LSECTION Card Key Battery Replacement [Advanced Keyless System]
CARD KEY BATTERY REPLACEMENT [ADVANCED KEYLESS SYSTEM]
1. Pull out the auxiliary key.
2. Replace the cap using a flathead screwdriver, then rotate and remove the cap.
CAUTION:
- Do not turn the cap excessively. The cap may be damaged.
3. Insert a flathead screwdriver into the crack and press the battery out.
4. Insert the new battery (CR2025) with the positive pole (+) facing the (+) mark on the cap.
Battery specification
- Lithium CR2025 x 1
NOTE:
- The batteries will last about 1 years when used10 times a day.
5. Rotate and close the cap.
6. Reinsert the auxiliary key.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.