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Clayso, Master Automobile Technician
Category: Mazda
Satisfied Customers: 880
Experience:  ASE Master Certified Automobile Technician. 30 Years Experience.
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Stop lights not working 54 mazda3 have changed switch cant

Customer Question

stop lights not working 54 mazda3 have changed switch cant find afuse
Submitted: 1 year ago.
Category: Mazda
Expert:  Clayso replied 1 year ago.

Hi There, I'm Clay a certified master automobile technician with 30 years of automotive repair and diagnostic experience.

The F21 horn fuse in the underhood fuse box supplies power to the brake lamp switch. Verify the fuse is good and there is power on the circuit. If the horn works there is a problem in the brake lamps circuit between the fuse and the switch. If the horn does not work the problem is with the fuse, fuse box or power from the battery to the fuse box.

I hope this information is helpful. If you have any questions or run into any problems let me know.

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