How to splice in additional sensors to your alarm
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Joined: Jan 2004
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From: Locash
How to splice in additional sensors to your alarm
I keep getting these questions in my email so here it is.
Top Right: DEI alarm, Bottom Left: top to bottom: tilt sensor, motion sensor, shock sensor. Y shaped things are 1N4001 diodes twisted together.
To splice in sensors, you need 1N4001 diodes (approx 15 cents each) for the trigger and warn wires. Powered sensors have 3 or 4 wires. Red is power, black or orange is ground-when-armed, blue is instant trigger, and green (optional) is warn. On the alarm, the wire colors we are concerned with are Red power, Green door trigger, Blue trunk trigger, and Orange ground-when-armed. Notice that green and blue on the alarm are not the same as green and blue on the sensors. On the alarm, they are both full triggers. Also notice that the orange ground-when-armed wire is different than the black chassis ground. It's preferable to have the sensors powered up only when the alarm is armed.
In the diagram, I have the tilt sensor spliced into the door trigger wire. You could also splice it into the blue trunk trigger wire. If you aren't using this wire, then it's a good choice because you wont have to mess with diodes. Tapping into the alarm wires is preferable since the 18 gauge wires are easier to work with. You can splice a 4 wire sensor in the same way. If it's a DEI sensor on a DEI alarm, you just loop the sensors green and blue wires together. If it's a different brand, your mileage may vary.
Your other option is to branch the trigger wires off an existing external sensor using diodes. I don't recommend taking power or ground off the little sensor wires. Tap them into the alarm wires instead. Note that you don't use diodes on the power and ground wires.
The stripe on the diode always faces the sensor. To connect wires to the diodes, just wrap the wire around the "bar" of the diode, then solder them together. Heat shrink is best but electric tape does the job.
Corrections, constructive criticisms are welcomed.
Top Right: DEI alarm, Bottom Left: top to bottom: tilt sensor, motion sensor, shock sensor. Y shaped things are 1N4001 diodes twisted together.
To splice in sensors, you need 1N4001 diodes (approx 15 cents each) for the trigger and warn wires. Powered sensors have 3 or 4 wires. Red is power, black or orange is ground-when-armed, blue is instant trigger, and green (optional) is warn. On the alarm, the wire colors we are concerned with are Red power, Green door trigger, Blue trunk trigger, and Orange ground-when-armed. Notice that green and blue on the alarm are not the same as green and blue on the sensors. On the alarm, they are both full triggers. Also notice that the orange ground-when-armed wire is different than the black chassis ground. It's preferable to have the sensors powered up only when the alarm is armed.
In the diagram, I have the tilt sensor spliced into the door trigger wire. You could also splice it into the blue trunk trigger wire. If you aren't using this wire, then it's a good choice because you wont have to mess with diodes. Tapping into the alarm wires is preferable since the 18 gauge wires are easier to work with. You can splice a 4 wire sensor in the same way. If it's a DEI sensor on a DEI alarm, you just loop the sensors green and blue wires together. If it's a different brand, your mileage may vary.
Your other option is to branch the trigger wires off an existing external sensor using diodes. I don't recommend taking power or ground off the little sensor wires. Tap them into the alarm wires instead. Note that you don't use diodes on the power and ground wires.
The stripe on the diode always faces the sensor. To connect wires to the diodes, just wrap the wire around the "bar" of the diode, then solder them together. Heat shrink is best but electric tape does the job.
Corrections, constructive criticisms are welcomed.
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