©
2005
Directed Electronics, Inc. all rights reserved
13
Identifying the Door Lock System
There are eight different types of common door lock circuits found in vehicles (some vehicles use
more unusual systems). The eight most common systems are:
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Type A: Three-wire (+) pulse controlling factory lock relays.
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Type B: Three-wire (-) pulse controlling factory lock relays.
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Type C: Direct-wired reversing-polarity switches. The switches are wired directly to the motors.
This type of door lock system has no factory relays.
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Type D: Aftermarket door servo driven systems. These include slave systems without an actuator
in the driver’s door but with factory actuators in all the other doors. These can be controlled
with the installation of an aftermarket motor in the driver’s door.
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Type E: Electronically-activated vacuum systems. This may require special programming of the
system.
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Type F: One-wire system.
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Type G: Positive (+) multiplex resistor-based circuit.
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Type H: Negative (-) multiplex resistor-based circuit.
