Changing the Battery in BMW Comfort Access vs Non-Comfort Access Key Fob Remotes

Understanding BMW Comfort Access and Non-Comfort Access Key Fobs

BMW offers two types of key fobs for their vehicles: Comfort Access and Non-Comfort Access. Each type serves a different purpose and requires specific methods to change the battery. Understanding these differences is crucial for maintaining your key fob’s functionality.

Comfort Access allows you to unlock the car without pressing a button. You can simply grip the handle, and if the key fob is in your pocket, the car will unlock. This feature enhances convenience and ease of use.

Non-Comfort Access requires you to press a button to unlock the car. While it lacks the hands-free convenience, it still provides reliable access to your vehicle.

Identifying Your BMW Key Fob Type

Identifying whether you have a Comfort Access or Non-Comfort Access key fob is essential before attempting to change the battery. Here’s how you can distinguish between the two:

• Comfort Access key fobs have a visible battery slot.
• Non-Comfort Access key fobs do not have a battery slot.

Additionally, Comfort Access key fobs often feature a cutout or round area on the back, while Non-Comfort Access key fobs are typically solid with no visible access points.

Changing the Battery in Comfort Access Key Fobs

Comfort Access key fobs use a CR2032 replaceable battery. Changing the battery is a straightforward process:

1. Remove the valet key.
2. Use a flat-head screwdriver to pop off the backing.
3. Replace the CR2032 battery.

This process applies to various models, including the BMW 7-series (2001-2008), 5-series (2007-2010), and 1-series (2004-2013).

Changing the Battery in Non-Comfort Access Key Fobs

Non-Comfort Access key fobs use a VL2020 rechargeable battery. Replacing this battery is more complex:

1. Score the edges of the key fob using a box cutter.
2. Carefully pry apart the fob to access the internal circuit board.
3. Desolder the two points attaching the battery.
4. Replace with a new VL2020 battery with 90-degree angle legs.

This process is necessary for models such as the BMW 3-series (2006-2012), X6, and X5.

Tools You Will Need

Before starting the battery replacement process, gather the following tools:

• Flat-head screwdriver
• Box cutter
• Soldering iron
• Superglue (optional)

Having these tools on hand will make the process smoother and more efficient.

Step-by-Step Guide for Comfort Access Key Fobs

Removing the Valet Key

Start by removing the valet key from the key fob. This will expose a small opening that you can use to pry off the backing.

Popping Off the Backing

Use a flat-head screwdriver to gently pop off the backing of the key fob. Be careful not to damage the internal components.

Replacing the Battery

Once you have access to the battery compartment, replace the old CR2032 battery with a new one. Ensure it is securely in place before reassembling the key fob.

Step-by-Step Guide for Non-Comfort Access Key Fobs

Scoring the Edges

Use a box cutter to score the edges of the key fob. This will make it easier to pry apart the two halves of the fob.

Prying Apart the Fob

Carefully pry apart the key fob to reveal the internal circuit board. Take your time to avoid damaging the components.

Desoldering the Battery

Using a soldering iron, desolder the two points attaching the VL2020 battery. Remove the old battery and prepare to install the new one.

Installing the New Battery

Place the new VL2020 battery in position, ensuring the 90-degree angle legs align with the solder points. Solder the battery in place and reassemble the key fob.

Common Issues and Troubleshooting

When changing the battery in your BMW key fob, you might encounter some common issues. Here are a few tips to help you troubleshoot:

• If the key fob doesn’t work after replacing the battery, double-check the battery placement.
• Ensure the battery is securely in place and the fob is properly reassembled.
• For Non-Comfort Access fobs, make sure the soldering points are correctly connected.

If you continue to experience issues, consider consulting a professional for assistance.

Maintaining Your BMW Key Fob

Proper maintenance of your key fob can extend its lifespan and ensure reliable performance. Here are some tips:

• Regularly check the battery status.
• Avoid exposing the key fob to extreme temperatures.
• Keep the key fob clean and free from dirt.

By following these simple steps, you can keep your key fob in optimal condition.

FAQ

How often should I change the battery in my Comfort Access key fob?

The CR2032 battery in Comfort Access key fobs typically lasts several years. However, it’s a good idea to check the battery status annually to ensure it remains functional.

Can I replace the VL2020 battery in my Non-Comfort Access key fob myself?

Yes, you can replace the VL2020 battery yourself if you have the necessary tools and skills. However, if you’re not comfortable with soldering, it’s best to seek professional help.

What should I do if my key fob stops working after replacing the battery?

Double-check the battery placement and ensure the fob is properly reassembled. If the problem persists, consult a professional for further assistance.

Is it necessary to use a specific brand of battery for my key fob?

While it’s not mandatory to use a specific brand, it’s recommended to use high-quality batteries to ensure optimal performance and longevity.

How can I tell if my key fob battery is low?

Common signs of a low key fob battery include reduced range, difficulty unlocking the car, and a warning message on the vehicle’s dashboard.

Conclusion

Understanding the differences between BMW Comfort Access and Non-Comfort Access key fobs is crucial for proper maintenance and battery replacement. By following the steps outlined in this guide, you can ensure your key fob remains functional and reliable. Whether you have a Comfort Access or Non-Comfort Access key fob, regular maintenance and timely battery replacement will keep your BMW key fob in top condition.