How do you turn off the security on a 05 Nissan altama

SOURCE: service engine soon

Check for any loose wire harness connection or bad contacts.

SOURCE: My car keeps shutting off

could be cam sensor fault or just even ecu may need remapping

SOURCE: CRANK SHAFT POSITION SENSOR 20002 NISSAN ALTIMA

1st, Nissan had a recall on Crank position sensors for 2002-2006 Altima's. Check with you dealer before you go doing any repairs. You may discover you can get your car repaired at no charge.
NHTSA Campaign ID number :O7V527000
Symptom: Erratic behavior. Stalling and no starts and very difficult to diagnose due to the time frame in which the component actually malfunctions. The warranty should not be limited to the original owner.
I would also need more specifics as to which engine you have so I might assist you in where the location of the sensor is. The Altima had a 4 and a 6 cyl engine offered that year.

SOURCE: need to change the stop light for 05 nissan maxima.

Open the trunk, from the inside remove the side trunk liner (by removing the plastic tabs the liner can be pulled back). Once the liner is pulled back you will need to remove two nuts which secure the tail light in place. Once the two nuts are removed you can start pulling the whole tail light assembly out. There are two other tabs that secure the tail light in place which may give you some resistance but the light should come out without too much force once the two nuts are removed.
Once the tail light is out you can change whatever bulbs you need to.

SOURCE: MY NISSAN ALTIMA 2006 2.5

did you check the sensors and if you are getting fuel and spark