1992 245 SRS light no code or reset

Greetings all... long time reader... first time contributor,
I have a very well maintained 92 245, with a SRS light that will not give up any codes when using the SRS port next to the hazard switch. I have also tried disconnecting the battery for 1/2 hr X 3 with no change. I have read that the connections will sometime get corroded, I will try that this weekend, is there any other clues or suggestions while I have the wrenches and cuss words out?
I have read pretty much all the posts on this forum and others, I suspect that the crash sensor may have packed it in...? I will see if there is a used one in a non crashed donor and try that as well if I can find one for a "reasonable" price.