The Mazda Protege Door Lock is a lock that protects the cabin, as all the doors are locked until the driver decides to unlock them, which provides security against theft, and the doors do not swing open when the vehicle is in motion. The first versions were based on a simple key-operated lock cylinder connected by rods to the latch, thus disabling the outside handle when the interior knob was turned or the key was flipped. With the development of the car line, Mazda also introduced power locking, and small electric actuators are placed on each of the latches; the driver could send current through a relay or control module to snap all the latches locked or unlocked with one switch on the dash or armrest. Subsequent generations also added remote keyless entry, which places a radio transmitter into the key fob transmitting a coded signal to a receiver located inside the car, allowing one-button operation as well as audible or light feedback when the lock button is pressed twice. A large number of units also connect to an automatic mode, which closes the doors when drive is chosen or the vehicle attains some preset speed, and opens them when park is chosen. During production, Mazda did not change the underlying latch, thus all Door Lock models continue relying on the robust mechanical connective clasp that holds the striker. Frequent lubrication of cylinders and latches will prevent hard-working, crooked rods or burned actuators, and the Protege Door Lock will continue to work with a simple click on any Mazda in this line.
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