Well, I somehow managed to bugger this "plug and play" CC install. Any assistance veterans of this procedure can provide will be very much appreciated. Ordered the parts and everything went swimmingly with two exceptions:
1) The clock spring popped right out in spite of my best efforts to leave it undisturbed. Nothing broke, but I had a dickens of a time reinstalling it. More on that in a minute.
2) A curious neighbor interrupted me right as I was slipping the steering wheel back onto the spindle. I didn't mind getting out of the car and patiently explaining to him what I was up to (his repeated comments about how ill-advised my DIY job was did get annoying however. "I would have just taken it to the dealer".) Yadda, yadda, yadda.
When my curious neighbor moved on, I finished the job, reconnected the battery and fired it up. This next part is key: the green cruise dash light came on when I activated CC, and the trip computer worked; I could tab through all of the functions. The only thing that remained was to take it for a test spin and confirm the CC functioned properly.
I got maybe 30 seconds down the road when I realized two things: my steering wheel was misaligned by a single spline but more importantly: it was loose! I had been about to install the nut when my neighbor distracted me. When I returned to the project, I completely forgot. Yes I know, that was monumentally stupid of me. But I safely pulled over and with the needed tools still in my car, I disconnected the battery a second time, popped off and disconnected the airbag/horn assembly, realigned the steering wheel and installed the vital steering wheel nut.
Back on the road, I get up to speed and push the cruise control button ... nothing happens. Worse, I see that my airbag light in on. And to top it all off, my trip computer is stuck on trip odometer A. It's registering mileage, but it wouldn't change modes (distance to empty, mpg, etc,) Now I cannot say with 100% certainty that the airbag light was not on when I first reconnected everything, but I think I would have noticed that if it were. The cruise control at least activated at first, and the trip odometer was definitely working in all modes. In case anyone wants to know, the Bluetooth and radio controls still work just fine.
I've now disassembled and reassembled the steering wheel a half a dozen more times, all with the same disappointing result. The only thing I can think of is it somehow has something to do with the clock spring. Those ribbon cables look fine, I didn't disconnect anything except for the plug for the steering wheel harness and in any case if I did somehow damage the clock spring, why do the radio and Bluetooth controls still work? But the fact remains that clock spring was really hard to reinstall and honestly, I'm still not confident I did it correctly.
I've read through all 20 pages of this thread twice now. Soul15 posted about difficulties with the clock spring back when he did this mod back in 2016 (page 16 of this thread). His written description is very detailed, but without pictures it's really hard to follow. And I'm still struggling with why some, but not all of my steering wheel functions are working if I've damaged the clock spring.
Anyone as boneheaded as I have similar troubles with this mod? I obviously am still keen on having cruise control but at this point I'd settle for a fully functioning trip computer and especially a working driver's side airbag. Thanks very much in advance.