Owners of other Mazda vehicles such as the CX-5, CX-3, CX-30, MX-30, CX-8, Mazda8 (MPV), MX-5 Miata, Mazda2 (Demio), Mazda3 (Axela), Mazda6 (Atenza) and Mazda5 (Premacy) may also find these DIY instructions to be helpful.

The compatible replacement festoon style light bulb is part number DE3175 which is available from various manufacturers such as Sylvania, Bosch, Philips and GE.

If you would like to have brighter map lights that will also last much longer before burning out like the traditional incandescent bulbs, install some DE3175 LED units.

The only tool needed to access and replace the map light bulbs is a small flat head screwdriver or a plastic pry bar tool.

To prevent from scratching the plastic surfaces, you can either cover the tip of your screwdriver with a thin micro fiber cloth or instead use a small plastic pry bar tool.

Insert the blade of the screwdriver in between the translucent plastic lens cover and the overhead console near the front edge (closer to the windshield).

Very gently pry out the lens cover to release the "C" shaped retaining clip from the plastic bar mount.

Repeat the process to pry out the retaining clip on the other side of the lens cover.

Do NOT pry near the rear edge of the lens cover (closer to to the back of the SUV). There are two plastic tabs on the rear edge of the lens cover that can be easily broken.

Set the lens cover aside in a safe place.

If the old light bulb was recently turned on, be careful when you remove it. The bulb might still be hot enough to burn your fingers.

Pull out the old light bulb. The OEM (original equipment manufacturer) light bulb was marked as part number KHA 12V8W 48E24G (or KHA12V8W48E24G).

If you'd like to have brighter map light bulbs, install some compatible replacement DE3175 LED units.

Make sure the new light bulb is securely installed in the socket.

Tip - If you installed an LED bulb and it doesn't work, try removing it from the socket, rotate it 180 degrees and push it back into the socket. Some LED bulbs are "polarized" and will only work when the "+" positive and "-" negative electrical contacts are in the correct orientation.

Line up the lens cover with the two plastic tabs inserted into the rear edge of the housing (closer to the back of the vehicle).

Try to avoid using excessive force. The retaining clips should pop in relatively easily.

To test the new light bulbs, press the rear edge of the lens cover to activate the "On / Off" switch.

Be sure to write down the bulb change in your car's service records.

For more, please check out all of the 2016-2021 Mazda CX-9 DIY Repair & Maintenance Guides.