When testing for lock / unlock / trunk wires, closely follow the instructions and when checking electrical connections, use a volt meter (multi-meter, voltage meter, etc.), DO NOT use a test light. It is easy to accidentally damage the circuitry in modern vehicles testing for wires with a test light.
Reverse polarity systems are
more complicated than many
other types of door lock systems.
The door lock system sends +12
volts in one direction while
holding chassis ground in the
other direction. This is true for
both lock and unlock. Testing for
this system, you will check for
continuity to chassis on the lock
and unlock wires at rest (nothing
being presed) as well as a +12
volt pulse on the lock and unlock
wires when pressing the door
switch.
Just like a positive triggered
system, the lock wire will register
+12 volts when you press the lock
switch, and the unlock wire will
register +12 volts when you press
the unlock switch.With reverse
polarity, when neither switch is
being pressed, these wires will
show continuity to ground on
your meter-. On a positive
system, the wires will show a high
resistance to ground rather than
a dead short.When you have
located the correct wires cut
them in half. Without pressing
the lock/unlock switches---The
side of the wires that continue to
show continuity to ground are
switch side and the motor side will
be open.
Connect the switch side and
motor side of each wire per the
diagrams on the right. Note that
improper connection may
damage your vehicle or module.
