How to Open a Mazda with a Dead Key Fob
- First, if you are already inside, click here.
- Second, you can find some video help here!
- Finally, if you need or want another manufacturer, click here.
Retrieving the mechanical key
Retrieving the mechanical keyFor early Mazda models, slide the release lever on the back of the advanced key (remote control or ‘clicker’) to release the auxiliary (mechanical) key. Pull out the auxiliary key from the advanced key. Use the key to unlock the driver’s door.
In 2020, Mazda introduced a new key fob style. It is distinguished by the lock, unlock etc. buttons being found on one side of the fob. The mechanical or auxiliary key is found inside.
To access it, slide the lever found on the top of the fob towards the side, as the arrow indicates. The back cover can then be slid 
away in the opposite direction and removed. The mechanical key can be seen inside and is simply lifted away, as shown.
If a key hole is visible, simply insert the mechanical key and turn and you’re in.
However, also in 2020, Mazda introduced a new door handle in the the Mazda3 and CX-30 models. In these 
models, the key hole can be seen only when the door handle is pulled to the open position. It may be awkward to reach and drivers with large hands may have difficulty, but the mechanical key must be inserted into the key hole while the door handle is pulled open. See the image to the right.
Once inserted, turn the key to the right. Return the key to the original position and remove it. Release the handle and pull it open again and you’ll be inside the car.
For pre-2020 models, there is video help here.
Continue to Part II, Getting Started …
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Remember that only proper service and repair procedures will ensure the safe and reliable operation of your car. In addition, proper safety procedures and precautions, such as the use of safety goggles, the right tools and the equipment should be followed at all times to eliminate the possibility of personal injury or improper service which could damage the vehicle or compromise its safety.
These posts are for information sharing purposes only, and should not be used in lieu of an OEM service manual or factory authorized service procedure. We are not in the auto repair business nor do we publish automotive service manuals. Nothing we include on these pages and posts has been reviewed, approved or authorized by any vehicle manufacturer.
Technology is always changing and what is current and accurate today may be literally out-of-date and inaccurate tomorrow. And when it comes to the current state of flux in the auto industry, nothing is more true.
The author has 25 years of automotive experience and has assembled the most extensive collection of symbols and warning lights anywhere (over 1,000!) and can help you open and start any keyless start car with a dead key fob battery. BA, St. Joseph’s College, ME: MS, Rensselaer Polytechnic Institute, NY