Changing the Battery in Your Mazda 3 Key Fob
It is frustrating to get in your car at the conclusion of a long and tiring day and discover that the key fob is dead. This is a simple fix that can be done at a big box retailer or hardware store.
A spare key fob for your Mazda 3 is an inexpensive method to avoid having to be towed to a dealership to have them reprogram the keys.
Battery Replacement
You can replace the battery on your Mazda 3 keyfob at home. You should only replace it when the battery goes out or if you get a message that reads "Low keyfob battery" on the multi-information display. Replace battery."
You'll need to use a flathead screwdriver with tape and patience to open the case. Find a gap or notch in the bottom portion of the metal of your Mazda 3's key fob, and insert the head of the screwdriver to cut off the lower half. Repeat this procedure for the top portion of the metal, but be careful not to damage the rubber ring that is at the bottom of the key fob's case.
When the fob case is open, you'll see the slots on either side of the case that houses the battery. Make use of the tape-wrapped flathead screwdriver to gently pry the case open, starting at one end and shifting to the other. Remove the old battery and then put in a new CR2025, making sure that it's in the right orientation for proper polarity. Finally, place the cap of the battery back on and reattach both sides of the key fob's case. Continue pressing until you can hear them click.
Once you've replaced your battery check the fob to ensure it is working by locking and unlocking your doors. If everything is in order you're good to go. Mazda 3 remote features can be used again.
Pairing Issues
This could mean that the transmitter inside your car is damaged. This is usually a matter for a professional and you will require a brand new key fob.
If you've tried replacing the battery and reprogramme the key fob, but it hasn't worked then the chip in the key fob might be defective. mazda 3 lost key could happen if the keyfob was dropped, exposed to saltwater, or handled by dirty fingers.
To determine the cause To determine the cause, you must find a small "key" built into the fob's seam which allows you to open it and take out the circuit board. Then, you will be able to examine for any corrosion or damage on the chip. It is recommended to use a clean towel to ensure that the chip is not damaged.
You may also examine the battery connector's terminals and see if they are cracked or broken. If this is the case, then carefully soldering them back in place will usually restore the function of the key fob. Also, you can check the buttons to determine whether they are worn out or damaged. If they are loose, they can be resoldered into position, unless they've physically snapped.
Interference Signals
There are few things more difficult than trying to start your car and then seeing the message "No Fob Detected". It happens at the worst situations, like when you're late for work or you're trying to collect your children from school/daycare. There are several things you can do to find out the root of the issue.
Interference signals can interfere with the remote key fob signal from the vehicle making it unable to function properly. It can be caused by things like weather conditions, buildings, and transmitters using the same frequency. Interference can also occur if you have equipment from an aftermarket manufacturer installed in your vehicle that transmits at the same frequency as the key fob.
In addition, if the key fob is exposed to salt or water waters, it could be damaged. The rubber seals on the electronic chip may be shattered by water, especially in the event that it is submerged for long periods of time such as in a swimming pool or at the beach. The chip may cease to function and require replacement of the keyfob. If you have a programmeable key you can clean the chip with isopropyl Alcohol or an electronic cleaner to aid in its return to functionality. If this doesn't help the chip, it's likely to be damaged and will need to be replaced.
Locking and Unlocking the Doors
The buttons on the key fob transmit electronic signals to a solenoid in the car that then transforms the signal into a mechanical action that locks and unlocks the doors. If the door lock is not working, the issue could be a solenoid malfunction that requires investigation with the assistance of an expert auto repair shop.
A dead 12 volt battery could also prevent the fob from functioning effectively. This could happen if your battery loses its charge or if the contacts become corroded. The good news is that a new battery can resolve this issue in a matter of minutes.
If the key fob isn't working after you have changed the battery or program it again the problem could be related to the receiver module. The device interprets radio frequency signals sent by the key fob to control the vehicle. It can be expensive to repair if it becomes faulty.
To verify if this is true, put your spare key into the key slot. Then, turn the ignition on. Press the key fob button twice within 10 seconds without removing it. The Mazda 3 system will now connect the key to the car and allow you to use it as your primary remote for driving. This allows you to program up three keys.