OK to day i got one of my tires fixed and as i left the tire place, i found that my SRS light on and also a 12 21 55 msg on my keydance.  the sucker wouldnt shift out of third, so i checked my wiring( cuz i got an aft. market shifter but after all that and after i restarted the comp. the SRS light is still on.  i don't know what to check for and what to do?

any help wud b nice.