How do you turn off the 'air bag' light?

2003 Dodge Dakota Crew Cab
3.9L V6 99000mi
While having a new radio put in my Dakota, they disconnected the passenger air bag turn off switch, which set the 'air bag' light. My local Dodge Dealer wants $75 dollars to put their 'reader' on it to clear it. I have an OBDII reader, but an engine code clearer won't do it. How can I turn it off without a special reader? I've tried the OBDII and took off the neg. Cable overnight. So far, no luck. Any Ideas? Thanks in advance.