Testing Reversing Polarity Systems - GM VSL 4000 Guide D'installation

testing reversing polarity systems

Use these instructions if the power door lock switch has four or five heavy-gauge wires. This type of switch has
two outputs that rest at (-) ground.
IMPORTANT! To interface with these systems, you must cut two switch leads. The relays must dupli-
cate the factory door lock switches' operation. The master switch will have one or two ground
inputs, one (+)12V input, and two switch outputs going directly to the slave switch and through
to the motors. These outputs rest at (-) ground. The lock or unlock wire is switched to (+)12V, while
the other wire is still grounded, thus completing the circuit and powering the motor. This will dis-
connect the switch from the motor before supplying the motor with (+)12V, avoiding sending
(+)12V directly to (-) ground.
It is critical to identify the proper wires and locate the master switch to interface properly. Locate wires that
show voltage when the switch is moved to the lock or unlock position. Cut one of the suspect wires and check
operation of the locks from both switches. If one switch loses all operation in both directions then you have cut
one of the correct wires and the switch that is entirely dead is the master switch. If both switches still operate
in any way and one or more door motors have stopped responding entirely, you have cut a motor lead. Reconnect
it and continue to test for another wire. Once both wires have been located and the master switch identified,
cut both wires and interface as described in the following paragraphs.
WARNING! If these wires are not connected properly, you will send (+)12V directly to (-) ground,
possibly damaging the alarm or the factory switch.
I H2/C WHITE/BLACK: Once both door lock wires are located and cut, connect the white/black wire to the
master switch side of the lock wire. The master switch side will show (+)12V when the master switch is oper-
ated to the lock position and (-) ground when the master switch is in the middle position.
I H2/D GREEN/BLACK: Connect the green/black wire to the other side of the lock wire. This is the motor side
of the lock wire and it goes to the lock motor through the slave switch.
I H2/E VIOLET/BLACK: This wire must be connected to a constant (+)12 volts. The best connection point for
this wire is the constant (+)12V supply for the door lock switch*, or directly to the positive (+) battery post
with a fuse at the battery post.
*NOTE: Except in GM cars with retained accessory power (RAP). In these vehicles, the (+)12V feed
to the door lock switches is turned off if the doors are closed for any length of time.
NOTE: Most direct-wired power lock systems require 20-30 amps of current to operate. Connecting
the violet/black wire to a poor source of voltage will keep the door locks from operating properly.
I H2/F BROWN/BLACK: Connect the brown/black wire to the master switch side of the unlock wire. The master
switch side will show (+)12V when the master switch is in the unlock position and (-) ground when the
master switch is in the middle position.
I H2/G BLUE/BLACK: Connect the blue/black wire to the other side of the unlock wire.
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18 - English
NVSL4000