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If the alarm system in your Nissan Altima is not functioning properly, you may need to reset it to restore its operation. The reset process is straightforward and only requires a few steps. Initially, you should lock the vehicle using the key in the driver's door and then unlock it using the same key. Following this, turn the vehicle on without starting the engine and wait until the antitheft light goes off, which may take around 5 minutes. Once this is completed, you should be able to start the car. If you encounter recurring issues with your alarm system, it is advisable to have Nissan inspect it to ensure there are no significant computer-related faults.
To reprogram the security system on a 2018 Nissan Altima, simply turn the key to the on position and attempt to start the engine. Once the key is in the run position, give it about 10 minutes for the security light to flash. Then, switch the key off and wait for 4 seconds before proceeding.
Perhaps the issue lies with a battery that has run out of power.
I am aware of that.
How to reset the anti-theft system on a 2013 Nissan Rogue model.