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Before you just scrap the whole airbag system, try reading the error code. Put it into diagnostic mode by doing this slightly different procedure:
1. Open the driver door and leave it open.
2. Turn the ignition switch to the on position but do not start the car.
3. Within 7 seconds, press the "door ajar" switch in door frame 5+ times.
4. After 7 seconds, press the "door ajar" switch one more time.
The SRS light will do one long (3 second) blink, followed by a series of fast (half second) blinks. Count the fast blinks.
2 = bad driver's airbag
7 = bad airbag module
8 = bad passenger's airbag
9 = multiple faults
If the fault is 2 or 8 try just unplugging the indicated bag and cleaning the contacts. If the driver's airbag is the problem it could also be a busted clockspring - does your horn work? If your clockspring is bad... then you are kind of boned and might as well tear it out, it's a 240SX specific part and apparently they are still available but over $1000. Same if the control module is bad and just cleaning the contacts doesn't fix it.
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