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[Zich]

Are the triggers on separate circuits for each door? If so, the installer accidentally just tapped into the driver door's circuit without realizing it wasn't for all the doors.

If there's a separate trigger for each door, you have to run wire for each trigger, and run them into the alarm's trigger input with diodes on each wire.

My gen3 only has one trigger input for all the doors though, I'm not sure about gen 4.. back when I had a '98 cavalier, it had separate inputs.