Alarm goes off installing battery in Nissan 350Z

Disconnect the negative cable first and then the positive cable and remove the battery. The lights/alarm will go out when battery is disconnected and may come back on when reconnected. Use door lock key fob to shut alarm/lights off if they come back on when battery is reconnected

if you have the key fob with you when you install the battery just hit unlock when you connect the battery it should stay off.

Here are a few ideas to check out: is your key fob working? If not, it could be the battery in your key. Unfortunately, after you put in a new tiny battery, it will have to be reprogramed. Could your car battery have worn itself down from frequent alarms?

will the alarm stop by itself after a period of time?

I had a car once that sometimes the alarm would go off while I was driving and id have to get out, shut door, put key in door and lock and unlock the car and it would turn the alarm off, and sometimes by just starting the car will turn them off... If you cant even start the car, or anything, you will probably have to call someone....... But first I would pop the hood and disconnect the battery for.. idk 10 minutes?(certain systems in the car can actually store a temporary charge) then reconnect the battery cable and see if alarm goes off? Leave the door open and such and unlocked while doing this and possibly when you re connect the battery cable it wont be activated

I couldn't turn off the security alarm on my 1999 Pathfinder as I replaced the battery,
Solution: I read the solution here to disconnect the positive cable, open the driver's door, insert the key, then reconnected the positive cable, while honking, I turn the key to the left, to the right and to the left again while the door is still open. The honking stopped. Then I started the truck without a problem. Thank you for the hint.

I have a 2000 Altima GXE. My alarm goes off intermittently and sometimes will not stop until battery lead is pulled. Have removed fuse and relay. Please help :)

Take the fuse out of the alarm until you get the car started and the battery is recharged.

This looks like you have a alarm problem,take the keys out and replace battery,if it starts honking press alarm off.If this don't work you have to find a Nissan workshop to calibrate the alarm and computer.It might be so bad that the car wont start at all after a battery change and that,s because the car was powerless for a short while and the computer thinks its been stolen and hotwired.God luck

do you have alarm???? any thing running ????
if not, you have a short.

yes
u have to reset it get a new controler