Okay, I decided to do a little write up.
Firstly, I would recommend u to get the manual for the NSX, so u get the diagram how the steering wheels actually come off. For the records, I did about 5 airbags total for various car. Only 2 cars I did disconnect the battery. It doesn't make sense that the airbag will deploy unless there is a short or surge of power. But precautions are always good.
Procedures:
1. Disconnect both negative and positive battery cable and wait for 30 min. I didn't do this, but better be safe than sorry.
2. Remove the dashboard lower cover, knee bolster pad, and knee bolster.
3. Remove steering column coves.
4. Disconnect SRS main harness to cable reel (yellow color). All SRS related wiring are covered with yellow insulation.
5. Remove the access panel cover located behind the steering wheel on the left side (if you are sitting on the car), and disconnect the airbag connector and use the short connector.
6. Remove the 2 torx bolt.
7. Remove the access panel on the right (behind cruise control buttons) and remove the torx bolt.
8. Remove the airbag assembly.
9. Remove the center steering wheel nut.
10. Remove the wiring reel. Depending on the model of the hub, you might not need to do this. As far as I know all momo hub require removal of this.
To create a connection for the horn, find the wire lead to horn ground. And connect them to the back of the hub. U can use copper or other metal that u can find from battery places of remote controls or other items. Be creative. Sorry I can not help u finding the exact wire as I don't have the manual. I borrowed it last time when I need to do find it and can't remember now. U need the Electronic Manual, not the service manual to find this.
Good Luck,
Andrie
Oya, Do this at your own risk!!! I am not responsible for any discrepancies or mistake. Please check and recheck.