When the key is turned in the driver’s door lock, all the other doors on the
vehicle should also lock. Motors or solenoids in each door achieve this. If the
system can only be operated from the driver’s door key, then an actuator is not
required in this door. If the system can be operated from either front door or by
remote control, then all the doors need an actuator. Vehicles with sophisticated
alarm systems often lock all the doors as the alarm is set.
Figure 15.10 shows a basic door locking circuit. The main control unit contains
two change-over relays ...
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