If it lit caused by you, it is safe to reset it. If it comes by itself or unknown reason I would take it in for had it check out though. If you wanted to reset it, follow the steps below. The instruction had helped me reset the air bag light that caused by me start up the car with the seat belt SRS connector disconnected.
Here is where I found the instructions from, but the link no long works. I have saved the instructions, see below.
http://www.autotalk.com/how-to-reset-airbag-srs-light-on-2003-2006-infiniti-g35-coupe-2173/
If your airbag light is flashing because something random might have happened while you were working on the car then you can follow the following process to reset the computer. Auto-Talk recommends taking the car to the dealer to avoid any injury. However sometimes you know that airbag light came on because of some random mistake and you do not want to pay $100 for a rest so this is what you can do.
Ignition Key Method:
1) Turn IGNITION on (but don't start car)
2) After the AIR BAG warning lamp lights for 7 seconds, turn IGNITION off within 1 second.
3) Wait 4 seconds
4) Turn IGNITION on (but don't start car)
5) After the AIR BAG warning lamp lights for 7 seconds, turn IGNITION off within 1 second.
6) Wait 4 seconds
7) Turn IGNITION on (but don't start car)
After the AIR BAG warning lamp lights for 7 seconds, turn IGNITION off within 1 second.
9) Wait 4 seconds
10) Turn IGNITION on (but don't start car)
11) Wait 3 seconds
12) Turn IGNITION off
13) Wait 2 seconds
14) START Car (the light may be blinking slower than before)
15) Wait 3 seconds
16) Turn IGNITION off
17) Wait 3 seconds
18) START Car
