Hey, your post is deserving of its own thread, enough different things your dealing with from the thread you posted this on.
Anyway, there is a tsb for the clicking, not that it will fix it, there is a cancelor cam replacement that is slightly shorter iirc... I did it on mine, it helped some but didnt fix it, I am thinking when it annoys me enough ill take it apart and get a file involved and shave a little off of it. the part is less than 10 bucks iirc my employee cost was less than 5 bucks for the part.
Your problem is likely not a wheel speed sensor, cosidering the loss of other electronics, the wheel speed sensors are hard inputs directly to the abs module and will have NO effect on other module functions. I have seen a couple things causing the airbag light decently common on the wk, the wiring under the passanger seat likes to get munched up, dont know exactly why, there is not much there, i think typically when I see it people are stuffing crap under the seats. I know when I put my grand cherokee together I had a seat weight calibration error that had the abs lamp on, using the calibration weights and the witech I was able to sort that out quickly
I have seen a problem with the interior junction block where an internal relay is not making good contact causing inop heater and airbag light intermittantly (you wouldnt notice the airbag light that was already on).