Door Lock Harness (H2) Wire Connection Guide; Identifying The Door Lock System - GMC VSL 4000 Installation Manual

door lock harness (H2) wire connection guide

H2/A RED/WHITE input to on-board channel 2 (trunk release) relay
This wire is used to supply voltage to the output H1/12. If the trunk release circuit of the vehicle is positive on
H1/12, connect wire H2/A to (+)12V. Always fuse appropriately. If the trunk release circuit of the vehicle is neg-
ative on H1/12, connect wire H2/A to chassis ground.
H2/B BLACK/WHITE input to on-board domelight supervision relay
This wire determines what the output polarity of H1/4 will be. If the door pin circuit is negative, connect to
chassis ground. If the door circuit is positive, connect to a fused 12V source.
H2/C - H2/H power door locks
The system has door lock relays on-board, and can directly interface with most electric power door lock systems
drawing 20 amps or less.

identifying the door lock system

The easiest way to determine which type of door lock system you are working with is to remove the master
locking switch itself, which is usually on the driver's door or on the center console. Once you have determined
which type of factory door lock circuit you are working with, and the color codes of the switch wires to be used,
you can usually simplify the installation by locating the same wires in the vehicle's kick panel.
NOTE: Always retest the kick panel wires to make sure they work the same as the wires on the switch.
There are five different types of common door lock circuits found in GM vehicles (some vehicles use more unusual
systems). The five common systems are:
I Type A: Three-wire (+) pulse controlling factory lock relays. This system is most commonly found in GM four-
door trucks, SUVs and sedans.
I Type B: Three-wire (-) pulse controlling factory lock relays. This system is found in some late model GM vehicles.
I 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. This system is most commonly found in two-door GM cars and trucks.
I Type G: Positive (+) multiplex. A Resistor Interface Module (GM P/N 12496739) may be used for this type
of door locking system. This system is found in the 2001 and newer GM Aztek.
I Type H: Negative (-) multiplex. A Resistor Interface Module (GM P/N 12496739) may be used for this type
of door locking system. This system is found in 1999 and newer Grand Am and Alero models, as well as 2000
and newer Impala and Monte Carlo models.
NVSL4000
15 - English