A little more on 7073 or document ID 1914921. Addresses three separate issues:
(1) Wiring harness under driver seat. Remove seat,
inspect harness for binding/pinching tie wrap harness
out of harms way. Don't attempt yourself, an airbag
module is nearby. Only applies to vehicles with power/memory
driver's seat.
(2) Open/close rear lift gate 3 times in succession
using the switches on the liftgate. If no problem,
nothing further is required. If problem, replace
switch(s).
(3) Lubricate the I-shaft bearing/boot with GM
Superlube®, or equivalent, to relieve the friction
between the boot and the carrier. This is a simple
procedure to lubricate the intermediate steering shaft
boot/carrier contact points and is done from the
interior of the vehicle.