Battery for immobilizer

As you know, an immobilizer is an anti-theft device for a car. It can block certain modules. It operates using a button cell battery. However, the battery drains periodically, and it's time to replace it. So, what kind of battery is needed for an immobilizer, and how do you choose one? We'll discuss all of this below!

What power source is used in the anti-theft device?

Most often, alarm key fobs are battery operated. CR2032This is a 3-volt power source with a small capacity 225 mAh. It's definitely enough for six months. The diameter is 20 mm, and the height is 3.2 mm. It's a good idea to check if this battery is compatible with your immobilizer.

The main signs of a discharged immobilizer battery

A number of symptoms can indicate that your battery is running low. Below is a list of them:

1. I can't start the car.
2. Unable to open the car door.
3. A light on the dashboard is flashing, indicating that there is no connection with the key in the key fob.
4. The remote control doesn't work from a long distance, you have to get closer.
5. The keys on the key fob do not open the doors.
6. The ignition does not respond to signals from the key.
7. The dashboard displays Replace key battery.

How to replace the battery in the immobilizer?

It's best to entrust this work to a specialist from a trusted or reputable repair shop. For those who want to do the replacement themselves, follow these steps:

• Find out what kind of battery you need from the instructions for your key fob.
• Read how the replacement is performed.
• Using auxiliary tools such as a screwdriver, separate the keychain into two halves.
• Remove the old element.
• Make a replacement.
• Combine the two parts into one.
• Check the functionality on your car.

The rules for replacing the battery are caution, accuracy, and speed. Once you remove the battery, you'll have 3-5 minutes to install a new one. Otherwise, the factory code will be erased, and you'll have to resynchronize the central locking system with the key fob.

Read also the article Replacing the battery in a Volkswagen key.