Installation guide

© 2006 directed electronics
19
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 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.