Well, there is a sensor of sorts (just a switch, actually) in the latch portion of the seat belt. It's what activates the seatbelt
light on the dash. Mine failed a long time ago and just seems to assume the seat belt is always latched. Even when it was
flaky, it never prevented me from driving the vehicle. If yours for some reason did, you could always just close the circuit
and leave it that way. I always use the seat belt, so I didn't need the reminder... Mine has an electrical connector below the
latch portion, where it bolts to the seat hinge area, so it's not too tough to get to.
As far as the other seat belt functions, I'll have to look at the shop manuals to get more details. What I was able to locate
in Mooseman's collection of manuals here on GMTN didn't say anything about more electrical functions associated with the
seatbelts, and there's an entire 374 page pdf on the seats, so go ahead and double check those and see what I missed. I
did, admittedly, skim.
I'll come back in after I find the relevant volume (they've gotten scattered around the house) and get more details, but you
might want to hit Mooseman's manuals and see what you can find out.
EDIT: Found the manual: The replacement of the seat belt assembly is all mechanical, outside of the one electrical connector
on the buckle side. The buckle is just a matter of disconnecting that wiring harness and removing the nut.
The retracting portion takes about 12 steps for removal:
-Remove the seat switch bezel
-remove the seat trim panel
-remove the eat belt anchor nut
-remove the screw from the front seat back belt bezel
-slide the bezel off the seat belt
-remove the seat back cover and pad
-remove the seat back panel from the seat back frame
-remove the seat belt from the retractor bracket by sliding the seat belt through the slot
-remove the lower seat belt retractor retaining bolt and nut
-remove the retractor assembly by pulling the push pin from the seat back frame
-remove the seat belt retractor bolt from the bracket and seat back frame
-remove the seat belt retractor bracket from the seat back frame
Install:
-Position seat belt retractor bracket on seat back frame
-install seat belt retractor bracket bolt to the bracket and seat back frame (40 ft lbs)
-Position seat belt retractor assembly on to seat back frame
-install push pin on the seat back retractor to the seat back frame
-install the lower seat belt retractor bolt (40 ft lbs)
-install the seat belt into the retractor bracket by guiding the seat belt through the slot in the bracket
-install the seat back panel to the seat back frame
-install the seat back pad and cover
-slide the front seat back seat belt bezel on to the seat belt
-install the seat belt bezel to the retractor bracket with the screw (53 in lbs)
-Install seat belt anchor to the seat adjuster assembly with the nut. Ensure webbing is not twisted. (38 ft lbs)
-install seat trim panel
-install seat switch panel
That's a digested version of what the Helm manual has for the replacement. The only item associated with the seat belts
electrically works through the switch in the buckle, which communicates with the SIR system and the dash light. As long
as it's closed, you don't lose any safety features.
Good Luck!
Chris