In Automotive terms a deadlock prevents a car door from being opened from the inside when activated. From a security point of view this prevents a scum bag from opening a door from the inside after smashing a window.
Some vehicles will Automatically deadlock with a single press of the factory remote, where as others require you to press the lock button a second time to active the system. This method is also known as double locking and is supported by some alarms (Listed at the end of this post).
All Holden Commodores from the 1997 VT model onwards use the double lock method as shown in this video:
The Holden Commodore can also support an OEM upgrade alarm such as the Cobra AB3868 which be programmed to only arm the alarm when the dead locks are activated.
There are also a large number of European vehicles that have electronic deadlocking as standard.
This includes most modern vehicles from BMW, Audi, VW, Ford, GM (Europe) along with others. If in doubt if your car has this you could always read the owners manual!
Alarms that support double lock deadlocking:
- Autowatch 446RLi Premium
- Autowatch 279RL
- Autowatch 458RL
- Autowatch 555CLAM
- Autowatch 695CAN
- Steal Shield SS450
- Viper 2102V (Passive Keyless Entry System)
- Viper 211HV (Keyless Entry System)
- Viper 3100
- Viper 3102V
- Viper 3105V
- Viper 3305V
- Viper 3606V
- All Viper Remote Engine Start Alarms
- Cobra AK4198 * Not listed feature but can be made to work with some vehicles