The airbag light is on. I went to the shop 6 months ago I they told me the clockspring wire is broken. Yesterday I soldered it and went to the shop to clear the error code. They told me the computer can't read because of the aftermarket radio. The radio is the same like before. I checked online to see what does it mean. I found this article http://www.ross-tech.com/vag-com/aftermarket-radio.html
But regarding it the models before 1997 don't have this problem. I checked the voltage between the pins 4 and 7 and it is zero. Any suggestions what could be the problem?