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Car Security and Convenience / Alarm Modules

Alarm Modules:
2 Wire "all in one" Alarms
Keyless Entry Upgrade to an Alarm
Remote Alarm Modules

top of page 2 Wire "all in one"
Two wire alarm systems
Two wire unit connections:
  • Connect one wire (labeled (-) ground) to a clean & solid vehicle ground.
  • Connect the other to a constant (+) 12 VDC source inside the vehicle, do not connect at the battery.
These may also have internal impact/motion sensors and may work fine on some older vehicles, and some are better than others, but I would recommend that you stay away from them. Two wire & many all in one systems rely on current sensing to trigger them and are prone to false alarms on most of today's vehicles, especially General Motors. Some due have additional connections and can be hard wired. Some offer many features. But the engine compartment isn't the best place for electronics anyway, especially if you can help it. And more times than not, finding an adequate location to mount a small siren can be a small job of it's own. For the small difference in price, if any, it's worth stepping up to a more popular component type system.

top of page Keyless Entry Upgrade to an Alarm
Upgrading a factory Remote Keyless Entry to an alarm system
Upgrading the factory RKE (remote keyless entry) to an alarm system usually consist of 3 more connections, 4 if you plan to inhibit the trunk/hatch pin when opened by remote, than a basic alarm without keyless entry. Some vehicles may require additional connections and parts. If the driver's door unlocks on the first press of unlock on the transmitter, and the others unlock on the second press;
  • First locate the motor leg wire of the driver's door lock actuator that shows (+) 12 VDC while unlocking. Connect this wire to the"disarm #1" wire of the alarm.
  • Next locate the motor leg wire of any other door lock actuator that shows (+) 12 VDC while unlocking during the second press of the button. Connect this wire to the "disarm #2" wire of the alarm.
  • Now locate any motor leg wire that shows (+) 12 VDC when the doors are locking. Conect this to the "arm" wire of the alarm.
  • If you intend to inhibit the trunk/hatch release during remote opening, locate the wire that shows (+) 12 VDC while opening. Connect this to the (+) positive inhibit wire of the alarm.
Note: some alarm upgrade modules may require (-) negative inputs instead of (+) positive. If this is the case you will probably need to add relays since most RKE's do not switch ground to the actuators / motors. Check your installation manual first.

top of page Remote Alarm Modules
Please see Basic Connections
Car Security and Convenience:
Basic Connections (inputs)
Basic Connections (outputs)
Car Alarm Modules
Car Alarm Sensors / Triggers
Door Locks
Light Flash / Illuminated Entry
Starter Interrupts
Accessories & Add-ons
Help and Additional Resources:
Application Guides
Car Security & Convenience Forum
Car Security & Convenience Hot Topics
Car Security & Convenience Manuals
Car Security & Convenience Pictorials
Relay Diagrams (quick reference)
Resistor Color Code Calculator
Vehicle Wiring


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Wednesday, November 22, 2017 • Copyright © 1999-2017 the12volt.com Donate to the12volt.com Advertising Top of Page
Disclaimer: *All information on this site ( the12volt.com ) is provided "as is" without any warranty of any kind, either expressed or implied, including but not limited to fitness for a particular use. Any user assumes the entire risk as to the accuracy and use of this information. Please verify all wire colors and diagrams before applying any information.

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