The method proposed by profor will put the seat into an ‘occupied’ status, so the airbag will go off in the event of a crash. The method with the 2 100ohm resistors puts it into an unoccupied status.
Yesterday I had my car at the indy for an unrelated issue and I asked him to check on the computer whether or not the seat was coming up as occupied. I had the 2 100 ohm resistor bypass in place and the seat came up as ‘unoccupied’. I changed it last night to the profor's version (although I used a 47k resistor and a 1n4001 diode), and it was showing as ‘occupied’.
So, if you want your airbags to go off, you should use the 47k resistor and diode combo that profor explained.
Disclaimer: I’m not liable for anything you do or any damages you incur on yourself, your car, or other people….