I have a Nissan Xterra 04 with the same problem, and here's a link with the procedure and it work for me, also work on the Nissan Frontier,the Nissan Armada and I think this will work on more Nissan Models, I hope this will help more people since this is a common failure of Nissan.
I found more links.
http://www.nissanforums.com/966228-post7.html
http://www.automotivehelper.com/topic33863.htm
http://www.nissanforums.com/frontier/127195-reset-air-bag-light.html
The Process is :
If your Airbag Light is flashing on your Nissan it will not go off until it is reset. You can take it to your dealer, but most likely they will reset it (and probably charge you) and tell you if it comes back on there might be a problem and then they will do further diagnostics or replace the wiring harness (this is very expensive). For some reason this sensor trips quite frequently and we used this procedure a lot at the a Nissan Dealership I worked for. This works for most if not all Nissan models. Follow these directions-
1. Turn the key from off to on.
2. Watch the airbag light closely. It will stay on for a few secs. and then as soon as it blinks off (the start of the flashing), turn the key off instantly.
3. Count to 5 (1 Mississippi, 2 Mississippi . . . .) Don't rush this or it will not work.
4. Repeat steps 1-3 two more times until you have done the cycle three times.
5. Now turn the key on and watch the light. It will start blinking in a different, slower manner. This is diagnostic mode. You can watch this for a little while, no hurry.
6. Now turn the key off again, Count to 5 like in step 3 again, and turn back on. If the procedure worked, the airbag light will not be flashing.
If it does not work the first time, just repeat the steps again.
This must be taking to a qualified person to have checked out.
= How do you reset the Airbag light on a 2001 Nissan Maxima SE ? =
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No, there is not a reset button on the Nissan Xterra. However, there is a reset button on the clock in the Nissan Xterra to change the time. To reset the car, a technician would have to use their computer.
lookup on youtube and follow altima airbag reset it's the same
How do you reset the security system on a 2003 nissan xterra?
1996 nissan sentra air bag flashing how to reset
A flashing SRS light means there is a problem. It is a 2005 and the SRS is still under warranty. Take it to the dealer for repair.
To reset your airbag light, in a Nissan Altima, you should turn the car on. From there, as soon as the airbag light stops flashing, turn the car off instantly. Repeat this three times to reset the airbag light.
How to reset airbag light
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how to reset nissan 350Z airbag air bag light and infiniti G35 air bag ...www.youtube.com/watch?v=g5UQIF3Euu0