GMC Sierra 2500 HD 2023 Owner's Manual page 91

90 Seats and Restraints
2.1.2. For first time use, remove
and discard the rubber band
from the top tether loop (2).
2.1.3. Route the top tether (3)
through the loop (2).
2.1.4. Attach the top tether (3) to
the driver side of the center
top tether metal anchor (1).
2.1.5. Make sure the child restraint
top tether hook is
completely closed and
secured to the top tether
anchor.
Rear Passenger Side Position
Rear Passenger Side Position
2.2. For a top tether in the rear
passenger side position:
2.2.1. Remove the passenger side
head restraint and center
headrest. See Head
Restraint or Headrest
Removal and Reinstallation
later in this section.
2.2.2. Route the top tether (3)
through the loop (2).
2.2.3. Attach the top tether (3) to
the passenger side of the
center top tether metal
anchor (1).
2.2.4. Make sure the child restraint
top tether hook is
completely closed and
secured to the top tether
anchor.