The 2003 CTS's do not have a passenger sensor. The air bag is always activated.tv7son said:That light should not have to be reset.
I had the light intermittantly a while back, it turned out to
be the seat bottom on the passenger side. there is a pressure switch
under the seat indicating whether or not there is someone in the seat.
One way to tell is look at the rear view mirror and see if the passenger air bag is off when someone is in the seat. it the switch is bad you will get a light on the dash and the passenger airbag will be off with someone in the seat.
The dealer couldn't find the problem until the seat bottom failed perminantly.
I have an 05 and they should be close to the same.
I hope this will help you troubleshoot your problem.