Type H: Negative (-) Multiplex - Clifford Concept 450 Installation Manual

type H: negative (-) multiplex

The door lock switch or door key cylinder may contain either one or two resistors.
When interfacing with this type of door lock system, two relays or a DEI 451M must
be used.
Single-Resistor Type
If one resistor is used in the door lock switch/key cylinder, the wire will pulse ground
in one direction and resistance to ground when operated in the opposite direction.
Two-Resistor Type
If two resistors are used in the factory door lock switch/key cylinder, the door lock
switch/key cylinder will read resistance to ground in both directions.
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