Installation Procedure

Install the rear seat center retractor on to the cross car beam. Ensure the retainer tab engages the notch in the beam.
From the rear compartment, feed the rear seat center belt anchor plate and belt through opening in the rear shelf panel. See Figure.
From inside the vehicle, install the rear seat center shoulder retractor fastener.
Tighten:

Tighten the rear seat center shoulder retractor fastener to 30 N.m (22 ft lbs)

Fig 1: Rear Seat Center Shoulder Retractor Fastener
Courtesy of GENERAL MOTORS CORP.
Install the rear seat center belt escutcheon to the rear shelf opening.

Fig 2: Rear Seat Center Belt Escutcheon
Courtesy of GENERAL MOTORS CORP.

NOTE: Ensure that the fastener threads and fastener hole are free of any sealer patch material, and that the belt is not twisted.
Install the rear seat center belt lower fastener. Ensure the belt anchor is facing forward.
Tighten:

Tighten the rear seat center belt lower fastener to 41 N.m (30 ft lbs)

Fig 3: Rear Seat Center Belt Lower Fastener
Courtesy of GENERAL MOTORS CORP.
Install the rear shelf trim panel. Refer to TRIM PANEL REPLACEMENT-REAR WINDOW SHELF in Exterior/Interior Trim .
Ensure the seat belt buckles are stowed in the seat back pockets and install the rear seat cushion. Refer to SEAT CUSHION REPLACEMENT - REAR in SEATS .