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- 1). Purchase a new headlight bulb. When purchasing a new bulb, give the store clerk your VIN (vehicle identification number) to make sure the bulb will fit your Mazda 3.
- 2
Disconnect the vehicle's battery (see Resources). The battery box on the Mazda 3 can be found on the driver's side of the engine bay, close to the windshield. The battery should be disconnected every time you work with electrical components. - 3
Locate the headlight bulb module, located behind the headlight assembly. The Mazda 3 has ample room to access it without removing any other components. Turn the module counterclockwise to release it. - 4
Remove the bulb by turning it counterclockwise and lifting. Discard the old bulb. Place the new bulb in the slot and turn it clockwise to lock it. - 5). Place the module back into the rear of the headlight assembly and turn it clockwise to lock it back in place. Reconnect the vehicle's battery.
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