I did'nt use a single diode in my install.
I wired the doors to the green, and the trunk to blue. I used the piggyback harness that came with the glass break, plugged it to the brain and the other end to the shock sensor.
I tapped the blue tilt sensor and blue from the backup battery to the blue wire on the main harness.
If the tilt goes off, it shows as the hath being opened, but either way, the keypad and alarm goes off. The way I have it has yet to give me a false trigger or show an open trigger on disarm or arm.
Without using a relay, the alarm can run 2 sirens safely. You may be able to skate by with 3, but in the long run, a $3 relay will preserve the life of the alarm.
To do add a relay to drive multiple sirens, wire it like this:
Pin 87 = +12 volts
Pin 86 = brown siren from alarm
Pin 85 = ground
Pin 30 = multisiren output
Yes. But you had it wrong.
Pin 85 = Ground when armed
Pin 86 = Ignition
Pin 87a = Starter side of starter wire
Pin 30 = Key side of starter wire
Yes it does, but it's best to just kill the whole ecu completely.
I value my cars too much to just "give up"...
I've never had a car towed, I pay very strict attention to where I park. Not only that, but I am fortunate enough to work where I can see my car all day.
This alarm would not cause any problems for a tow company. But, It'd be a VERY VERY loud distraction for them...
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