Taken from "The Other" site, because I know where it is, but haven't looked on here.
If you have the airbag light, it will show steady for a few seconds (the manual says 7 secs) after you turn the key from off to on (but not start) and then start to flash. Here is how to reset it:
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 . . . .)
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.
If you have an actual problem with your air bag system, you can count the blinks in diagnostic mode and perhaps narrow down the problem.
I got the below information here: http://www.nagtroc.org/forums/index....=&showentry=31
The SRS airbag light on the driver console can be used to read SRS specific trouble codes on the GT-R without the use of a Consult-III device.
There are 2 modes of operation for the SRS indicator light, the normal every day one called "User Mode", and the more advanced "Diagnosis Mode".
Normally, the car always operates in Normal mode. That is to say, the light goes on for 7 seconds (if it doesn't, that's a fault code as well, or your lamp's burnt out) when the ignition is put to "ON", then one of these things can happen:
The light turns off (indicating all is OK!) and at this point, you cannot go in "Diagnosis Mode" (that advanced mode is only available when there's an actual trouble code)
The indicator stays on. Which means you should take cover because it indicates an airbag has deployed or a serious malfunction is occurring.
or finally, the indicator blinks in 1/2 second pulses, indicating there are SRS fault codes to be read
If you did something like change to aftermarket seats on a Premium (US) or Canadian car, you will lose the side airbags in the seats, and this will trigger an error code.
To read the actual malfunction code while trying to fix the issue (not going to detail that part here), you have to put the vehicle in SRS "Diagnosis Mode". Again, this can ONLY be done if you have condition #3 listed above.
Follow these steps to go from "User Mode" to "Diagnosis Mode".
Using the starter button, put the car to "ON" mode (without starting the car. Do not press the brake pedal).
The SRS Light will light up for 7 seconds. As soon as the SRS light goes off, turn the car off (before the quick 1/2 second error blinks appear)
Wait more than 3 seconds (count to 5!)
Do step #1, #2 and #3 two more times (you must do it three times total)
Put car to "ON"
At this point, if everything went right, you will now be in SRS "Diagnosis Mode". How to tell?
The SRS light will now light up for 7 seconds as usual, but then instead of blinking, it will either light up again for 3 seconds (A series code) or 2x 1.5 seconds (B series code) before flashing a 1/2 second error code and repeating again.
From that point on, your car will stay in SRS "Diagnosis Mode" until you clear all SRS error codes and turn the ignition off.
If there are still SRS error codes present when you shut the car off, it will come back in "Diagnosis Mode" whenever you put ignition to "ON". To get back to the regular "User Mode" without having to fix all the SRS errors, you must simply follow the same above steps #1 to #4 again, and the car will revert back to "User Mode".
Ok, so now you're in "Diagnosis Mode" where you get the initial 7 second SRS light followed by either a 3 second blink or 2x 1.5 second blink, then blink codes. All the codes will repeat sequentially so you should note them down (eg: 3 second light, 2 blinks, 3 second light, 5 blinks, 1.5 second light, 1.5 second light, 6 blinks, etc etc) . If you lose count, just turn the car off and then back to ON as it will stay in "Diagnosis Mode"
Here's the table for the blink codes that come after a 3 second blink:
0 blinks: Self-diagnosis result is not deleted
1. Front LH seat belt pre-tensioner
2. Driver air bag module
3. Front RH seat belt pre-tensioner
5. Occupant Classification System control unit
6. Crash zone sensor
7. Air bag diagnosis sensor unit
8. Front passenger air bag module
11. Front passenger air bag OFF indicator
If you've removed your OE seats with side airbags and need to check if the SRS error code is related to either passenger or driver side module, the following series of blink codes associated with the 2x 1.5 second SRS light are the ones to look for ( #1 and #2):
Here's the table for the blink codes that come after 2x 1.5 second blink:
1. Front RH side air bag module
2. Front LH side air bag module
3. RH satellite sensor
4. LH satellite sensor
5. RH side curtain air bag module
6. LH side curtain air bag module
If you're troubleshooting an error code and think it has gone away, you can turn the ignition off and back to "ON" to reread the diagnosis codes. If you happen to clear all the codes and turn the ignition Off, the car will AUTOMATICALLY go back to "User Mode" since there are no more user codes.
There is also a recall NTB07-009 on a rear KC door wire harness that can result in an air bag light.
VOLUNTARY RECALL CAMPAIGN 2004–2006 NISSAN TITAN REAR DOOR HARNESS
Nissan has determined that on some 2004 – 2006 model year Titan King Cab vehicles, a defect that relates to motor vehicle safety exists.
In some affected vehicles, there is the possibility that the wires in the harness routed through the rear doors and into the body on each side of the vehicle may break due to over bending of the harness as the doors are opened and closed. The wires in the harness control various systems including the seat belt pretensioners, the passenger side seat belt tension sensor, and rear audio speakers.
If the wire for the seat belt pretensioners breaks and makes contact with a wire for the speaker, there is a possibility that the pretensioner may deploy and tighten the seat belt. If this happens when the belt is retracted, it will not be possible to use the seat belt. If one of the wires for the seat belt tension sensor breaks inside the passenger side harness, the passenger side front air bag will not deploy as designed in a frontal crash. Nissan is conducting a Voluntary Recall Campaign to inspect the wire harness cover for damage and, if necessary, a new wiring harness with a new type cover will be installed and
BROKEN SPIRAL CABLE:
If the steering wheel is turned with the steering linkage disconnected, it frequently breaks the spiral electrical cable in the steering wheel. The symptoms include airbag light on, horn & cruise control don't work. This frequently happens during header installation due to turning the steering wheel after disconnection of the steering shaft in the driver side wheel well area. WARNING: ATTEMPTED REPLACEMENT OF THE SPIRAL CABLE MAY DETONATE THE AIR BAG IN YOUR FACE. Make sure you know what you are doing before attempting replacement of the spiral cable.