Experiencing issues with your 2010 Bmw 328i Key Fob after a battery replacement? You’re not alone. Many BMW owners encounter problems when attempting this seemingly simple DIY task. While a low key fob battery is a common warning sign on your dashboard, the fix isn’t always straightforward. Sometimes, after replacing the battery, your key fob might start the car but fail to lock or unlock the doors remotely. This can be frustrating, especially when you thought you were taking a proactive step to maintain your vehicle’s keyless entry system.
One common scenario is that owners successfully replace the VL2020 battery, often with a compatible ML2020, only to find the remote functions dead. You might be in a situation where your 2010 BMW 328i key fob starts the ignition without a hitch, confirming the chip is still functional for immobilizer purposes, yet the convenience of remote locking and unlocking is lost. You might even try putting the old battery back in, hoping to revert to the previous functionality, but find yourself in the same predicament – a key that starts the car but doesn’t remotely control the doors or trunk.
If you’ve recently replaced your 2010 BMW 328i key fob battery and are facing this issue, let’s explore some potential causes and troubleshooting steps. It’s crucial to ensure you haven’t inadvertently disrupted the key fob’s internal components during the battery replacement process. Sometimes, even if the new battery is outputting the correct voltage, a minor misstep in the delicate electronics can lead to these symptoms.
Potential Issues and Troubleshooting for your BMW 328i Key Fob After Battery Change:
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Battery Polarity: Double-check that the new battery is installed with the correct polarity. Even though it seems simple, reversing the polarity can prevent the key fob from functioning correctly for remote operations. Ensure the positive (+) and negative (-) terminals of the battery align with the markings in the key fob case.
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Soldering Issues: If you opted for soldering in a new VL2020 or ML2020 battery, inspect your solder joints. Cold solder joints or insufficient solder can lead to poor electrical contact. Ensure a clean and solid connection for both terminals of the battery. If unsure, reflow the solder carefully.
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Battery Compatibility: While VL2020 and ML2020 batteries are often cited as compatible, verify the specifications of the battery you installed. Ensure it matches the voltage and type required for your 2010 BMW 328i key fob. Inconsistent battery types might cause unexpected behavior.
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Key Fob Circuit Board Damage: During the opening or battery replacement process, it’s possible to inadvertently damage the circuit board within the key fob. Carefully inspect the board for any visible cracks, scratches, or dislodged components. Even static discharge can sometimes harm sensitive electronics.
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Key Fob Reprogramming: In some cases, after a battery change, the key fob might require resynchronization or reprogramming with the vehicle. While less common with simple battery swaps, it’s worth investigating the resynchronization procedure for your 2010 BMW 328i. Consult your owner’s manual for specific steps, which may involve a sequence of button presses and ignition key turns.
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Case Interference: Though less likely, a new key fob shell, if used, could potentially be pressing on internal components incorrectly. Try using the key fob without the new shell temporarily to rule out any mechanical interference.
If you’ve meticulously checked these points and your 2010 BMW 328i key fob still only starts the car but doesn’t remotely lock/unlock, it may indicate a more complex issue within the key fob’s electronics or the car’s receiver system. In such situations, seeking assistance from a qualified automotive locksmith specializing in BMW keys or a BMW dealership service center is advisable. They possess specialized diagnostic tools and expertise to pinpoint the exact problem and offer solutions, ranging from key fob reprogramming to potential replacement.
Remember, while DIY battery replacement can be successful, dealing with car key fobs involves delicate electronics. When in doubt, professional help ensures the issue is resolved correctly without risking further complications.
