Type H: Negative (-) Multiplex - Directed Electronics 446 Series Installation Manual

Type G Door Lock System Wiring Diagram:

Type H: Negative (-) Multiplex

NOTE: A GM Resistor Interface Module (GM P/N 12496739) may be used for this type of door
locking system. If using a Resistor Interface Module, use the instruction guide provided with the
Resistor Interface Module for this type of door locking system.
The system is most commonly found in 1999 and newer Grand Am and Alero models, as well as
2000 and newer Impala and Monte Carlo models. The door lock switch or door key cylinder may
contain either one or two resistors.
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.
Determining the Proper Resistor Values
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Directed Electronics, Inc.