A car alarm can help deter thieves, increase the resale value of your vehicle, and lower your insurance premiums. However, it’s important to install a high-quality system from a professional installer.
The control module stands like a sentinel, diligently processing signals from door sensors, motion detectors, and other inputs. When it detects tampering, the system emits either a warning or a full siren blast.
1. Installation
A car alarm is an electronic device that, when triggered by one or more sensors, emits a high-volume sound (typically a siren, klaxon, pre-recorded warning, or your vehicle’s own horn) to discourage theft of the car itself or its contents. It also usually activates the headlights and/or parking lights to flash, may send a signal to a remote monitoring company and/or your cell phone to notify the owner of a triggered event, and often cuts the ignition circuit so that the vehicle can’t be started.
Some models come with a sensor that reacts to the sudden change in air pressure when a window is smashed (which is actually triggered by a large dog barking too, so be sure to adjust it if you have pets). Most cars also include vibration and/or motion sensors. Some systems will even detect when the hood or trunk is opened and will alert the owner or police if there is movement.
Most of these sensors are connected to a small alarm “brain” that should be located near the center of your car and out of sight. Depending on the system, it may be possible to connect many of these sensors through an interface module that plugs into your car’s database. This will eliminate the need to run wires from each of the sensors to the brain.
2. Testing
Whether they keep cars from being stolen or just scare away potential thieves, car alarms are an essential safety feature. They also help to reduce the cost of a car insurance policy, and many insurers offer premium discounts to customers who have installed alarm systems.
A car alarm system has a number of sensors that are designed to detect suspicious activity. When the alarm is triggered, it triggers a loud siren and flashes lights to alert passersby of possible break-in. Modern car alarms are also able to send the owner a notification on their smartphone, keeping them in the loop wherever they are.
The control unit is the brain of a car alarm, processing signals from the sensors and deciding when to activate the alarm. Sensors include vibration sensors that detect bumping or movement of the vehicle, door sensors that detect when doors are opened, and glass-break sensors that can sense when a window has been broken.
While these are great security features, they can be prone to false activations. Some common causes of these false alarms are weather or local factors, such as strong winds or heavy traffic that can cause vibrations. Other issues can include a malfunctioning sensor or wire, or interference from other electronic devices. To avoid these problems, a digital multimeter can be very helpful when installing a car alarm or remote start system. The digital multimeter can be used to test the polarity of wires before they are connected to prevent any electrical faults.
3. Recommendations
Car alarms are designed to scare away thieves and vandals. They can also help to prevent your vehicle from being stolen, and can even lower your insurance premiums. However, they should not be used as a replacement for other security measures such as parking in well-lit areas and locking your doors and windows.
Basic car alarms typically consist of a control unit, shock sensors and motion detectors that monitor movement inside and around your vehicle. If the shock sensor detects any impact or vibration, it will send a signal to the motion sensors and they will activate the siren to warn off thieves. Some systems will also have a backup battery that keeps the system active if the alarm is triggered.
Other add-ons may include a remote start feature that comes built into the system or can be added later with a separate module. Some systems can also connect to a smartphone app, allowing you to receive alerts and to lock or unlock your vehicle remotely.
Some alarms will come with a trunk release feature that allows you to open your trunk with the key fob without having to unlock all of the doors. You can also get an alarm with tilt sensors that will alert you if someone is attempting to jack your car to remove the tires.
4. Installation of an Immobilizer
Car alarms can be combined with electrical immobilizers, which prevent the vehicle engine from being started. These are usually built into the alarm module or external to it, depending on the make and model. These typically work by monitoring the voltage on the starter line (the wire that goes from the ignition switch to the starter motor). They can detect when the battery is disconnected, or the ignition is switched off and back on again, and so will not allow the vehicle to be started once they are activated.
Many systems also have motion or proximity sensors that can detect movement around the car and warn people to keep away. This feature can come in handy, especially if you need to leave your vehicle unattended for a long time.
Another option is to have a tilt sensor fitted. These can help to deter thieves from towing your vehicle away in order to strip it for parts. They use mercury, which conducts electricity to monitor the angle of the vehicle and can trigger the alarm when this changes.
Car theft has been on the rise, and a well-fitting alarm can be a great way to prevent this from happening to your vehicle. It is important to ensure that you get an alarm that is Thatcham-approved and fitted by a professional.