Changing the Battery in Your Mazda 3 Key Fob
It can be a bit frustrating to drive off at the end of a long workday and discover that the key fob is dead. This is a simple solution that can be accomplished at a major box retailer or hardware store.
A spare key fob for your Mazda 3 is an inexpensive option to not have to take it to a dealership to have them re-program your keys.
Battery Replacement
You can change the battery on your Mazda 3 keyfob at home. But, you should only replace the battery when it goes out of service, or if the key fob displays a message in the multi-information display that reads, "Low key fob battery. Replace battery."
You'll need a flathead screwdriver and tape and patience to open the case. Find a gap or notch in the bottom portion of the metal of the Mazda 3's key fob and insert the head of the screwdriver to pry off the lower part. Repeat this step for the top portion of the metal but be careful not to scratch the rubber ring that is at the bottom of the key fob's case.
mazda cx-5 replacement key cost 'll find a slot on each side of the case that houses the battery. Start with one side of the case and gently push it open. Take out the old CR2025 and replace it with a brand new one, making sure you place it face-up to ensure proper polarity. Finally, place the cap on the battery and reconnect both sides of the key fob case. Keep pressing until you can hear them click.
Now that you've replaced the battery Check the fob to verify that it functions by locking and unlocking your doors. If everything is in order then you're able to use your Mazda 3's remote features to drive again!
Pairing Issues
If your key fob has stopped functioning suddenly, this could indicate that the transmitter in the car has been damaged. It's usually a task to a professional and you will require a new key fob.
If you've tried to replace the battery and reprogramme the key fob, but it's not working it is possible that the chip inside the key fob may be defective. This could happen if the keyfob has been dropped, exposed to saltwater, or handled by dirty fingers.
To diagnose this issue, you will need to locate a small "key" embedded in the seam of the fob that lets you take it apart and remove the circuit board. You will then be able to look for any corrosion or damage on the electronic chip. To prevent damaging the chip, it is best to use a fresh paper towel.
It is also possible to examine the battery connector's terminals and determine if they're damaged or cracked. If this is the situation you can solder the terminals back into place can usually restore the functionality of the key fob. You can also check the buttons for wear or damage. If the buttons are loose, they can be soldered back into place and also if a button has physically snapped off.
Interference Signals
There's nothing more frustrating than trying to start your car and seeing the message "No Fob Detected". It can happen at the most unfavorable occasions, such as the time you're late to work or when you have to pick up your children from daycare/school. There are several things you can try to figure out what's causing the issue.
Interference signals can cause the remote key fob to stop working properly. This could be caused by objects such as buildings, weather conditions, and transmitters that use the same frequency. Interference may occur if your vehicle has aftermarket equipment that transmits at the same frequency as your key fob.
In addition, if the key fob is exposed to water or salt seawater, it may be damaged. The water can penetrate the rubber seals of the electronic chip especially if the key fob is submerged in water for an extended period of time. This can cause the chip to stop working and will require replacement of the key fob. If you own a programmable key you can clean the chip using isopropyl alcohol or an electronic cleaner to help it get back to its original functionality. If this doesn't work you can be sure that the chip has fried and needs to be replaced.
Locking/unlocking the Doors
The buttons on the key fob transmit electronic signals to the solenoid inside the car, which transforms the signal into a mechanical action that locks and unlocks doors. If the door lock is not working, the problem could be a solenoid malfunction that requires some analysis with the help of an expert auto repair shop.
A dead 12 volt can cause the fob to stop working properly. This can happen if the battery is unable to charge or if the contactors get corroded and stop transferring electricity. 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 replace the battery or program it again the problem could be related to the receiver module. This device receives radio frequency signals from the key fob and interprets them to control the vehicle's functions. If it malfunctions, it can be expensive to fix.
To determine if this is the case, begin by inserting the spare key into the key slot and turning the ignition to ON. Press the key fob button three times within 10 seconds without taking it. The Mazda 3 system synchronizes the key to the vehicle and you can use it as your primary remote for driving. You can program up to three keys in this way.