2002 maxima alarm trouble

What dealer/company installed the alarm? It may have a current sensing circuit on it and when the computers shut down then it falses the alarm.Certified Security Specialist

Always check info with a digital multimeter.

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You probably don't have the owner's manual for the alarm, do you? Next time the alarm falses, go out to your car and disarm it, then open the door. BEFORE you start the engine, look at the alarm's LED; count how many times it flashes. These flashes tell you which "zone" of the alarm was violated...door, trunk, shock sensor, etcetera. If you can get hold of the manual, knowing which zone is falsing can be a valuable troubleshooting tool. Barring that, I would disconnect one zone at a time until the problem goes away. Your car has several trigger wires, all at the SECU (Smart Entrance Control Unit), which is a module to the right of the steering column. Pull the dash down and see how the alarm was wired up there. At the SECU, there's going to be a driver's door wire, an all-three-passenger-doors wire, a hood wire, and a trunk wire. A good installer would connect the alarm to all of these wires....but some installers will leave the hood and/or trunk unprotected, to save installation time. Also, your alarm surely doesn't have four separate trigger inputs (it probably has only two), so the installer would need to use diodes to protect all of those zones. Anyway, get to the SECU, and figure out which things the installer did (or didn't) hook up. Disconnect one thing at a time until the alarm stops falsing, and you've narrowed down your problem. Alternately, you could disconnect ALL zones at once, and then hook them back up one at a time until the alarm falses again. Also, if the alarm still falses with ALL zones disconnected, it is probably bad. I've never heard of a shock sensor that would false after 30 minutes, but it could never hurt to try disconnecting that too.