I was installing a new radio in my 1998 tahoe. I took off the trim around the radio and unplugged the auto tranfee button. When I put it all back together i forgot to plug it back in. I know have a service tran light on after I plugged it back in and the 2l/auto/4lo/4hi button does nothing. Is there a way to reset this again? Or is this a dealer only thing? thanks