How can I reset the security system of a 2005 Nissan Altima?

To reset the system security on your 2005 Nissan Altima, it's important to ensure that your car battery is fully charged. This precaution is necessary as the reset process may drain the battery, and the last thing you want is to end up with a dead battery. Assuming your battery is ready, start by getting into your Altima and turning the ignition key to the on position. After a few seconds, attempt to start the engine (crank it over), knowing that it probably won't start at this point. Keep the key in the run position for 10 minutes while monitoring the security light, which should blink and then turn off. Switch the key to the off position and wait for about 10 seconds before attempting to crank your Altima again. If the engine still does not start, you can repeat this process up to three times. If the issue persists after three attempts, your next step would likely be to seek assistance from your dealership.