I left my headlights on for a few hours and I needed a jump start. I drove for a few hours and the car ran perfectly fine. The next day I drove the car twice and everything seemed normal. The third time I started the car, the battery light stayed on and then the brake light turned on. I drove around for a while, and the ABS light turned on, and then the air bag light started flashing. I just parked the car, turned off the ignition. The headlights seem to work, but now I can't start the car. The battery "may" be weak, but will it cause all these dummy lights to turn on at once? Maybe an ecu problem?

I really hope its only a battery problem.................
its late at night and raining hard so I can't investigate further at this moment.

 

Replace your battery, it's no longer holding enough current to support your cars electrical system. If a cell is shorted within the battery, it could be putting a large draw on the alternator, bringing down the cars voltage level enough to upset the electronics.

Get a new battery and have to alternator tested to make sure it's putting out the correct voltage and amperage to support the cars electrical system.

 

Check alternator voltage, on Nissans usually if all the dummy lights tun on its saying the alternator is shot.