2005 GMC Canyon, 3.5L I5, 4wd, 4 door. Just had the motor rebuilt and before this the 4wd worked fine but when I got it back, the "service 4wd" indicator was displaying and none of the lights that indicate 2wd, 4 hi/lo, neutral, are not lit up whatsoever & 4wd is not working at all. I'm thinking they forgot to plug something back in... maybe a plug that goes on the control module...? Any help would be GREATLY APPRECIATED!