How to Replace the Battery in Your BMW 7 Series Non-Comfort Access Key Fob

Introduction

Replacing the battery in your BMW 7 Series key fob may seem like a daunting task, especially if you have a non-comfort access key. However, with the right tools and a bit of patience, you can easily do it yourself. This guide will walk you through the steps to replace the VL2020 battery in your 2001-2008 BMW 7 Series non-comfort access key fob.

Tools You Will Need

Before you begin, gather the following tools:

• Box cutter
• Phillips screwdriver
• Soldering iron
• Solder pump
• Small flathead screwdriver
• Super glue (optional)

Step-by-Step Guide

Step 1: Disassemble the Key Fob

Start by removing the valet key from the fob. This will allow you to access the edges of the key fob more easily. Use your box cutter to score around the edges of the key fob, paying special attention to the top part. This process may take 5-10 minutes, so be patient.

Once you have scored all the way around, use a small flathead screwdriver to gently pry apart the sides of the key fob. Continue until you can pull the two pieces apart and access the internals of the key fob.

Step 2: Locate the Battery

Inside the key fob, you will see the battery, which is a VL2020. This battery is rechargeable and usually recharges when the key is inserted or near the car. However, if it needs to be replaced, you will need to desolder it from the circuit board.

Step 3: Desolder the Old Battery

Using your soldering iron, melt the solder on the two points where the VL2020 battery is attached to the circuit board. Use a solder pump to suck up the melted solder. This process may take a few attempts, so don’t rush.

Once the solder is removed, gently pry the battery’s legs away from the circuit board. Be careful not to break anything. Remove the old battery completely.

Step 4: Prepare the New Battery

Before you install the new battery, make sure it has legs that are offset by 90 degrees, similar to the old one. If the legs are offset by 180 degrees, it will not fit properly.

Step 5: Solder the New Battery

Insert the legs of the new VL2020 battery into the slots on the circuit board. Ensure they are aligned correctly. Use your soldering iron to apply a small amount of solder to secure the battery to the board. Make sure the connections are solid.

Step 6: Reassemble the Key Fob

Once the new battery is soldered in place, reassemble the key fob by snapping the two pieces back together. If the key fob does not snap back together securely, you can use a little bit of super glue around the edges to hold it in place.

FAQs

What is a non-comfort access key?

A non-comfort access key does not have the feature that allows you to unlock and start your car without physically using the key. It requires you to insert the key into the ignition to start the car.

How do I know if I have a non-comfort access key?

If your key does not have a way to easily pop the back off, it is likely a non-comfort access key. Comfort access keys have a removable back cover for easy battery replacement.

What type of battery does my key fob need?

The non-comfort access key fob for the BMW 7 Series 2001-2008 models uses a VL2020 rechargeable battery.

Do I need to reprogram my key fob after replacing the battery?

No, replacing the battery does not require reprogramming the key fob. It should work as usual once the new battery is installed.

Is it safe to use super glue to reassemble the key fob?

Yes, using a small amount of super glue around the edges can help secure the key fob if it does not snap back together properly. Just be cautious not to use too much.

What if I have never soldered before?

Don’t worry; this task is straightforward even for beginners. Take your time, and follow the steps carefully. There are also plenty of online tutorials to help you get started with soldering.

Where can I buy a replacement battery?

You can purchase a VL2020 battery online from retailers like Amazon. Ensure you buy one with the correct leg orientation (90 degrees).

Conclusion

Replacing the battery in your BMW 7 Series non-comfort access key fob is a manageable task with the right tools and a bit of patience. By following this guide, you can save time and money by doing it yourself. Just remember to take your time and be careful with the delicate components inside the key fob.

Good luck, and happy driving!