CrimeStopper CS-2015.FM.RevB Installation Instructions Manual page 11

DOOR LOCKING SYSTEMS
NOTE: This door lock information is provided as a guide. Your particular vehicle may differ.
Negative Trigger (-): Many Imports; Late model Ford & General Motors
Negative trigger door lock systems send a negative (Ground) pulse to existing factory relays to lock and unlock the vehicle
doors. Testing with a Volt/Ohm meter or Digital Volt/Ohm Meter (DVM): Attach the red lead to a +12Volt constant power
source. Use the Black lead as your testing probe and find the wires that cause the meter to show +12.0 Volts when the lock
and unlock buttons on the door panel are pressed. The Negative lock/unlock outputs of this alarm system can be directly
interfaced to the lock/unlock wires for most vehicles with Negative type systems.
Positive Trigger (+): Many General Motors; Chrysler / Dodge / Plymouth
Positive trigger door lock systems send a Positive (12V) pulse to existing factory relays to lock and unlock the vehicle doors.
Testing with a Volt/Ohm meter or Digital Volt/Ohm Meter (DVM): Attach the Black lead to Chassis ground (Vehicle body
metal). Use the Red lead as your testing probe and find the wire that causes the meter to show +12 Volts when the lock
button on the door panel is pressed.
Reverse Polarity: Many Ford/Lincoln/Mercury/Dodge/Chrysler/Plymouth and GM Trucks
Reverse Polarity systems use no relays, but instead the door lock/unlock motors are controlled directly from the lock and
unlock switches in the door. The lock and unlock wires rest at Negative Ground when not in use. When the lock or unlock
button is pressed, one of the circuits is "Lifted" and replaced with +12V causing a lock or unlock to happen. Reverse Polarity
system require external relays or a relay module.
Single Wire (Dual Volt): Ford Probe 1990-97, 1995-UP Chrysler Minivans/Stratus/Cirrus, some 2000-UP GM
Dual voltage systems have lock/unlock switches that send varying amounts of Positive voltage OR Negative ground current
through resistors to SAME wire for both lock and unlock. When the vehicle's Body Computer Module (BCM) or door lock
module senses different voltages on this wire, the system will either lock or unlock. Single wire door lock systems require
external relays or a relay module and resistors.
Semi Automatic: European makes and some Imports Saab, Volvo, Isuzu, Hyundai
Semi Automatic systems use a power lock control for all doors EXCEPT the Driver's door. The only way to control
lock/unlock on this type of system is to lock or unlock the Driver's door. There are also NO Lock/Unlock buttons or switches
present in this type of system. The only way to gain control of a Semi Automatic system is to install a door lock Actuator
(motor) in the Driver's door. The Actuator will electronically control the drivers for lock and unlock which will cause all doors
to now lock and unlock with the alarm. Actuators are available from Crimestopper (Part # CS-610S1) at a low cost. Installing
actuators can be difficult and time-consuming. (Varies from vehicle to vehicle.)
Electric Vacuum Pump: Mid 1980's through Mid 1990's European Makes (Mercedes, Audi)
These systems use vacuum-operated mechanisms to lock/unlock the doors from a central pump usually located in the trunk.
This system can be controlled via the vacuum pump control wire and 2 relays. In some cases, you can also control vacuum
systems by adding and actuator to the driver's door as in Semi-Automatic Systems.