Many electrical problems in a Mazda 3, such as a horn or interior lights that suddenly go out, are most often the result of a blown fuse. While this problem may seem annoying at first, it is much easier and cheaper to fix than most other car problems. The process you must take to replace a faulty car fuse is almost as simple as unplugging and then plugging in any electronic in your home. Regardless of your prior experience in working with cars, it only takes a few minutes to locate the faulty fuse and replace it.
Look in your owner's manual to determine which fuse box contains the faulty fuse. New Mazda models have one fuse box under the hood and another beneath the dashboard.
Open the fuse box to gain access to the faulty fuse.
Look at the fuse box diagram in the manual to determine the exact location of the faulty fuse. The diagram has the same set-up as the actual fuse box and includes captions of what each fuse is used for.
Pull the faulty fuse out with a fuse removal tool or needle-nose pliers. A fuse removal tool is typically in the fuse box, but this is not always the case.
Put a new fuse of the same size and power in place of the faulty fuse. Close the lid for the fuse box.
