What is a Passive Car Alarm? (All You Need To Know)

As a car owner, you need to safeguard your vehicle from vandalism and theft, and the best way to protect your vehicle is to install a car alarm.

Therefore, you need to know the different types of alarms available in the market to choose the best design, such as a passive alarm. But what is a passive alarm? If you’d like to find out, keep reading!

What is a Passive Car Alarm?

Passive alarms are the most common types of alarm systems in the market. This system turns off automatically after the driver removes the key from the ignition and closes the doors. A driver doesn’t have to activate it manually, therefore, it’s more convenient. However, you can choose between the active and passive because they cost the same.

To learn more about a passive car alarm, how it works and how it differs from an active alarm, keep reading for more useful facts and tips!

What’s the Difference Between Active and Passive Car Alarms?

While passive car alarms automatically arm themselves, active car alarms require physical action from the driver. After parking the car, you have to turn on the alarm system by pressing a button on a remote.

Compared to the passive alarm system, the active alternative doesn’t come with accidental “set-offs.” Since the driver is in control, they can open the door with the remote key fob as many times as possible.

This active car alarm system is riskier, however, because you could forget to arm it after parking your car, which exposes your vehicle to theft and vandalism. However, car owners can toggle between the active and passive systems if your alarm system allows it.

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How Do You Know if Your Car Has a Passive Alarm?

How Do You Know if Your Car Has a Passive Alarm?

If your vehicle has a passive alarm system, you’ll notice that the alarm activates automatically without using the remote control.

If your car has another alarm system like an immobilizer, your vehicle will become immobilized if someone uses a different device than a key on your keyhole. This immobilizer also switches on emergency lights and locks the steering wheel.

What are the Advantages of a Passive Car Alarm?

If you’re looking to install a passive car alarm, here are some of the advantages you should expect:

1. It’s Automatic

As soon as you turn off the engine and lock the doors, the alarm arms itself, meaning you don’t have to do it manually.

2. It’s Safer

You won’t forget to switch on the alarm with passive car alarms because the device sets itself automatically, which is important if you park in public places where your car is vulnerable.

Overall, installing a high-quality alarm system such as a passive alarm deters thieves from tampering with your car due to the loud alert.

3. Reduced Insurance Costs

3. Reduced Insurance Costs

An alarm system, whether active or passive, lowers your insurance premiums. Therefore, if you have installed this alarm, you’ll pay lower premiums than a car owner who has no security system installed.

Insurance companies use factors such as vehicle safety when calculating the total cost you need to pay. Therefore, if your car theft risk is reduced, the firm will lower your insurance cost.

4. Car Resale Value

If you plan to sell your vehicle in the future, you’ll fetch a higher price if you have a high-quality passive car alarm system.

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Alarm systems are necessary, meaning your buyer won’t need to pay extra to install the system if you have one, and will be comfortable paying you more for the extra features that keeps the car safe.

5. Less Worry

Having a passive alarm gives you peace of mind, so you don’t have to think about leaving your car in a public parking space.

What are the Factors to Consider When Installing a Passive Car Alarm?

What are the Factors to Consider When Installing a Passive Car Alarm?

After identifying the benefits of having this type of alarm system in your car, there are some  other factors you should consider, including the following:

1. Compare Prices and Brands

There are various types of aftermarket passive car alarm systems to choose from, so when purchasing a system, ensure that it’s from a reputable company and that the price is reasonable.

If you buy an alarm system from a fake brand, it will not work when you need it too, which is risky for your vehicle.

2. Use A Professional Mechanic

Car alarms are an essential safety feature; therefore, they need to be installed correctly by a professional, so to keep your car safe, ensure that you receive the best services.

To find out more, you can also see our posts on the Avital car alarm reset, how much is a car alarm, and what triggers a car alarm.


For your car to be safe, you need to have a well-functioning alarm system, and passive alarms are the most common types of alarm systems on the market.

If your car has this passive system, the alarm automatically turns off after the driver removes the key from the ignition and closes the doors. Therefore, the driver doesn’t have to manually activate it, which is more convenient.

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