Understanding Your BMW 3 Series Key Fob
Replacing the key fob battery for your BMW 3 Series is a straightforward process. This guide covers the E90 model, used from 2006 to 2012.
Models like the 316i, 330i, and 328i use this key fob. First, determine if you have a comfort access key or a non-comfort access key.
Comfort access allows unlocking the vehicle by grabbing the handle and starting the car with a push button. Non-comfort access requires inserting the key physically. Let’s dive into the steps to identify and replace the battery.
Identifying Comfort Access Key Fobs
To identify if you have a comfort access key, look at the back of your key. If there’s a square outline, it means you have a comfort access key.
This type of key has a non-rechargeable, replaceable battery. On the other hand, non-comfort access keys require more effort to access the battery and may need soldering. This guide focuses on the comfort access key fob.
Steps to Replace the Battery
Follow these steps to replace the battery in your BMW 3 Series key fob:
- Press the valet key to pop it out.
- Locate the small slot in the middle of the fob.
- Use a small flat-head screwdriver or nail clippers to pry the back off.
- Remove the old battery.
- Insert the new CR2032 battery, ensuring the positive side faces up.
- Snap the back cover back on.
- Reinsert the valet key.
It’s essential to ensure the positive side, which has the text, is facing you when inserting the new battery.
Common Models and Years
This key fob model applies to various BMW 3 Series models from 2006 to 2012, including:
- 316i
- 318i
- 320i
- 323i
- 325i
- 328i
- 330i
- 335i
- M3
- 316d
- 318d
- 320d
- 325d
- 330d
- 335d
These models use the same key fob and battery replacement process.
Tips for a Successful Battery Replacement
Here are some tips to ensure a smooth battery replacement:
- Use a quality CR2032 battery.
- Keep a small flat-head screwdriver handy.
- Be gentle when prying the back cover off.
- Double-check the battery orientation.
Why Replace the Battery?
Replacing the battery ensures your key fob functions correctly. A dead battery can leave you stranded, unable to unlock or start your vehicle.
Regularly check your key fob’s battery status and replace it as needed. It’s a simple process that can save you from potential inconvenience.
Signs Your Key Fob Battery Needs Replacement
Watch for these signs indicating your key fob battery needs replacement:
- Reduced range
- Intermittent function
- No response when pressing buttons
If you notice any of these issues, it’s time to replace the battery.
Maintaining Your Key Fob
Proper maintenance can extend the life of your key fob. Here are some tips:
- Avoid dropping it
- Keep it away from water
- Replace the battery promptly
By following these tips, you can ensure your key fob remains in good working condition.
FAQ
What type of battery does the BMW 3 Series key fob use?
The key fob uses a CR2032 coin battery.
How often should I replace the key fob battery?
Replace the battery every 1-2 years or when you notice reduced functionality.
Can I use any CR2032 battery?
Yes, but it’s best to use a quality brand for longevity.
What if my key fob still doesn’t work after replacing the battery?
Check the battery orientation and ensure it’s properly seated. If it still doesn’t work, consult a professional.
Is the replacement process the same for non-comfort access keys?
No, non-comfort access keys require more effort and may need soldering. This guide focuses on comfort access keys.
Can I replace the battery myself?
Yes, the process is simple and can be done at home with minimal tools.
Where can I buy a CR2032 battery?
You can purchase CR2032 batteries online or at most electronics stores.
How do I know if my key fob has comfort access?
Look for a square outline on the back of the key. If present, you have a comfort access key.
Conclusion
Replacing the battery in your BMW 3 Series key fob is a simple task. By following this guide, you can ensure your key fob remains functional and reliable.
Regularly check and replace the battery to avoid inconvenience. With minimal tools and effort, you can keep your key fob in excellent working condition.
Remember, using a quality CR2032 battery and proper maintenance can extend the life of your key fob. Happy driving!