How to Start the Mazda 3 When the Key Fob Battery is Dead?
2 Answers
Eject the mechanical key and enter the vehicle. Place the back of the smart key near the start button and press it. For vehicles with a push-button start, there is usually an induction zone inside the car where the smart key can be placed nearby, and the car can still be started. Relevant details are as follows: 1. After the Mazda 3 key fob battery dies, it should be replaced as soon as possible. The Mazda 3 comes with a remote key + mechanical key, where the mechanical key can be inserted into the remote key. All models are equipped with a keyless start system and remote start function. It is recommended that drivers avoid long-distance remote operations during daily use to conserve battery power. 2. Method for replacing the Mazda 3 key fob battery: First, pull out the mechanical key, insert a screwdriver into the groove, and slightly pry open the cover with the screwdriver. Insert the screwdriver into the gap between the cover and the transmitter, then pry it open and remove the back cover of the key. Remove the battery cover and then the battery. Install the new battery and cover the battery cover, ensuring the positive side of the battery faces upward. Finally, replace the key back cover and reset the mechanical key.
I've encountered the issue of a dead key fob battery several times while driving my Mazda3 Axela, and I must say it's quite common. The solution is to first use the mechanical key to open the door—it's hidden inside the smart key fob case, just insert it directly into the door lock cylinder. Once inside, sit in the driver's seat, press and hold the brake pedal, then bring the smart key close to the start button—the Mazda3 Axela is thoughtfully designed to allow keyless start even with a dead battery, just keep it firmly pressed until you hear a beep confirming signal reception, then press the button to start the engine. If it doesn't start, the key might be completely dead or there could be signal interference—try changing positions or using the spare key. I recommend buying some CR2032 button cell batteries for DIY replacement; it only costs a few bucks. If you're unsure, have it checked at the dealership. For daily prevention, regularly check the battery life to avoid mid-drive failures that could compromise driving safety.
