Taken from supraforums:
1. Connect a couple of wires to the terminal Tc and AB on the check connector. Don't jump them together!!
2) Turn IGN to ON or ACC and wait approx. 6 seconds.
3) Starting with Tc, connect other end of wire to ground alternately to Tc and AB and hold for 1 plus or minus .5 secs each. Do this so that each terminal is connected to grd twice. At the end of cycle, keep applying ground to Tc (third time for it, but keep it grounded.)
TIP. (Make sure you connect the next wire to ground within .2 secs after disconnecting the other one. Basically, you do it fast.)
4) After several secs, when the airbag warning light starts to blink in a 64 ms cycle, procedure is done. Just keep trying if you don't clear the first time. I had to try it 3 times.
HTH.