Cars can be fitted with an electronic locking system which is connected to the car’s alarm system. To lock the car from the inside, the driver uses the key to lock one of the front doors and all the doors lock automatically. The driver can lock or unlock all doors by locking or unlocking the driver’s side door lock manually or by pressing the lock and unlock buttons on the key fob or dashboard.
Other than being a hugely convenient system, it is a very important safety feature. Every key has a unique code which is matched with the code in the alarm system. Once the key is used to lock the car, an immobiliser goes off in the engine. Only when the onboard computer detects the same code from the car key will it unlock the immobiliser in the engine. When the immobiliser is on the engine of the car will not start.
Central locking systems evolved to systems that could be operated with a remote. That had buttons on a remote attached to the key. The car can be locked or unlocked with the remote. Some remotes have a button to set off the car alarm. Car remotes are extremely useful for locating your car in a car park. People lock and unlock their cars with the remote and the sound and blinking lights help you locate your car. These remote locking systems work on the principle of radio waves.
Central locking security systems are available in the aftermarket from Rs. 2,500 onwards. Autocop and Nippon are reputed brands for automobile security systems, with prices of Autocop central locking systems starting from Rs. 3,000.
The latest trend in remote locking is keyless entry. The car does not come with anything in the shape of a key. There are electronic key cards that never have to be taken out of your pocket. The car detects the key which can be in your pocket, hand, bag, etc. Once the key is in certain proximity of the car, the car automatically unlocks itself. The start button can be used to start the car. As long the key is in the vehicle the car will keep going.