How does an L.E.D. Scanner work with an alarm system?
-Most aftermarket alarm systems have a grounded output when armed. The yellow sense wire of the L.E.D. Scanner can be connected to this output. When the alarm is activated, the output will turn to ground and activate the L.E.D. Scanner. You should refer to the alarm manufacturer installation guide for the color of this output wire.
I'm having difficulty getting the L.E.D. Scanner to work with my alarm system.
-Step 1 Check to see that the black wire on the L.E.D. Scanner is grounded to the vehicle ground. Use a volt meter to test continuity if possible.
-Step 2 Check to see that the red wire on the L.E.D. Scanner is getting positive 12 volts. Use a volt meter to test if possible.
-Step 3 Now take the yellow L.E.D. Scanner wire and touch the vehicle ground or chassis. Does the L.E.D. Scanner turn on? If yes, then go to step 4. If not, go to step 5.
-Step 4 Check to see that the alarm system is providing a grounded output when armed. To do this you can use a volt meter to check continuity. If no ground is detected, then refer to the owner's manual to verify correct that you have selected the correct wire.
-Step 5 Disconnect the red and black wire from the vehicle. Now twist the black and yellow wire together. You can now verify if the L.E.D. Scanner is working by touching the red wire to 12volt positive and black/yellow wire to ground. This test can be performed directly at the L.E.D. Scanner. If it does work, then the wiring inside the vehicle was not correct.