Modern cars now usually come with a key fob that’s battery operated for easy access and control over the vehicle. Of course, this also includes BMW models. Key fobs are now a standard in the car making industry but what happens if you replace the battery of your key fob?
The BMW key fob is a convenient and essential accessory for modern BMW owners. However, there are times when the key fob may stop working after a battery change, leaving owners puzzled and frustrated.
In this article, we will cover what BWM owners can do to fix their key fob when it’s not working after changing its batteries. We will also explore the reasons behind what’s causing this issue and provide a step-by-step process to fix why your BMW key fob not working after battery chance.
With this in mind, do note that in some instances, reprogramming your BMW key fob after a battery change may be required.
Why is my BMW key fob not working after a battery change?
In most cases, a key fob that doesn’t work after changing the battery is universal. There are a few common reasons as to why this happens.
But before we get into it, a BMW key fob operates on a small battery, usually a CR2303 battery, that powers its electronic functions, such as locking/unlocking the doors, activating the panic alarm, and starting the engine remotely (depending on the model).
After replacing the key fob’s battery, it’s not uncommon to experience issues with its functionality.
As mentioned earlier, there are several reasons why your BMW key fob might not work after a battery change and those are:
Battery installation: An incorrect installation of the new battery is a common reason for key fob malfunction. It’s easy to get confused when removing and placing the new battery. Especially since the indicators where it states the proper position of the battery when installing is not quite visible.
To fix this problem, ensure that the battery is placed in the right orientation and securely seated in its compartment.
Battery quality: Low-quality or depleted batteries can hinder the key fob to properly function. Always use high-quality, brand-new batteries from reputable manufacturers.
Key fob damage: Like every electronics, if your key fob has been exposed to physical damage or got wet, it might have internal components that are not functioning correctly.
To fix this problem, open the key fob and inspect the electronic components. Check if there are water marks, burnt components, or any form of physical damage. If this is the case, then your only option is to purchase another key fob for your BMW.
Synchronization issues: One of the most common issues that prevents your BMW key fob to function properly is due to syncing issues.
The key fob and the car’s security system might need to be synchronized again, especially if the key fob has been without power for an extended period.
Do I need to reprogram my BMW key fob after changing the battery?
In most cases, you do not need to reprogram your BMW key fob after a battery change. Changing the battery should not affect the key fob’s internal programming or the key’s ability to communicate with your BMW’s security system.
However, if the key fob is not working even after a battery replacement, reprogramming might be necessary to resolve the issue.
For most BMW models, the following steps should let you reprogram the key fob of your BMW;
- Put the key into the ignition.
- Move it to position 1 and back in rapid succession, do this for five times in a row.
- Press and hold down the unlock button.
- Then press the lock button three times.
- Release the unlock button.
- Turn on the ignition.
If successful, your key fob should be working again. Otherwise, you may be driving a BMW model that requires a different reprogramming step.
In that case, we highly recommend reaching out to your local BMW dealership or an experienced BMW maintenance staff. You can also contact BMW by calling their customer service for assistance.
How do you reprogram a BMW key fob after a battery change?
Before attempting to reprogram your BMW key fob, ensure that you have the replacement battery correctly installed. If the key fob still doesn’t work, follow the steps below to reprogram it:
Step 1: Start by getting in the driver’s seat of your BMW with all doors closed and the ignition key out.
Step 2: Insert the key fob into the ignition slot (for keyless start/stop vehicles, keep the key fob nearby).
Step 3: Press and hold the ‘Unlock’ button on the key fob while simultaneously keeping the ‘Lock’ button pressed. Hold both buttons for about five seconds, then release.
Step 4: Repeat Step 3 two more times, pressing and holding the ‘Unlock’ and ‘Lock’ buttons simultaneously for five seconds each time.
Step 5: Remove the key fob from the ignition slot (or move it away from the vehicle for keyless start/stop models).
Step 6: Test the key fob by locking and unlocking the doors and, if applicable, starting the engine remotely.
If the reprogramming was successful, the key fob should function as expected. Otherwise, seek professional assistance from an experience BMW mechanic or from your local BMW dealership.
Furthermore, it is best to note and keep in mind that the reprogramming process may vary depending on the BMW model and year, so it’s essential to refer to your vehicle’s owner’s manual for specific instructions.
Additional Tips:
Having to go all through the steps we have provided and the key fob of your BMW still not working, it’s best to consider consulting a professional to fix the problem for you.
Additionally, it’s also worth to mention that performing proper car maintenance including the key fob of your can will prevent these issues from happening.
We understand that this can really be frustrating but we highly recommend that you do the following to avoid unnecessary issues to come.
Replace the key fob battery promptly: To avoid issues with your BMW key fob, it’s good practice to replace the battery before it completely drains. Low battery power may result in erratic functioning and potential reprogramming needs. At worst, you may need to grab a brand-new key fob.
Use an original or high-quality replacement key fob battery: Rule of the thumb, avoid using cheap unreliable batteries. It may do more harm than good and at worst case scenario, could potentially cause your key fob to malfunction permanently. So, investing in a quality battery from a reputable brand can prevent premature depletion and ensure better performance.
Check for physical damage: Examine your key fob for any visible damage. If you notice cracks, dents, or signs of water damage, consider replacing the key fob or seek professional assistance.
Reprogramming an Extra BMW Key Fob
If you own an extra BMW key fob for your BMW car, here’s how you can reprogram or set it up to have both key fob work with your vehicle:
- Get inside the car with all door and windows closed.
- Make sure you have both the key fobs with you.
- Insert the working key fob into the ignition.
- Set it to position 1(set to accessory mode). Your dash and accessories should all power on.
- Turn the key back and remove it from the ignition.
- Hold the unlock button on your working key down and then depress the lock button three times.
- Release the unlock button afterwards. The doors of your BMW should automatically lock and unlock.
- Use the new key and hold down the unlock button while pressing the BMW logo three times.
- Release the unlock button.
If successful, all doors should lock and then unlock indicating that you’ve successfully programmed the new BMW key fab.
Conclusion
Having to experiencing a non-functional BMW key fob just after a battery change can really be frustrating, but in most cases, it can be resolved without the need for reprogramming.
In most cases, ensuring the correct installation of the replacement battery should fix the problem.
So, it is best to keep using high-quality replacements, to prevent such issues from arising. However, if reprogramming becomes necessary, following the step-by-step guide provided for your specific BMW model should get your key fob back in working condition.
Additionally, do remember to consult your vehicle’s owner’s manual for model-specific instructions. If in for some reason you’re in doubt, then it is best to seek assistance from a certified BMW technician for a seamless resolution.
With these tips in mind, you can continue enjoying the convenience and security offered by your BMW key fob.
Source:
https://getjerry.com/car-repair/why-does-my-key-fob-not-work-after-replacing-the-battery
https://www.pacificbmw.com/manufacturer-information/how-to-program-bmw-key-fob/