CrimeStopper CS-2015.FM.RevB Installation Instructions Manual page 10

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. Positive systems require external relays or a pulse inverter.
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.