GM Service Manual Online
For 1990-2009 cars only

Installation Procedure

Caution: To help avoid personal injury from unrepaired crash damage to a restraint system, perform the seat belt check for each seat belt system. Replace the seat belt system if there is any doubt about the condition of system components.

  1. Remove the seat. Refer to Front Seat Replacement - Bucket in Seats.
  2. Remove the trim panel off the sheet metal below the rear window.
  3. Remove the carpet off the rear panel.

  4. Object Number: 156689  Size: SH
  5. Locate the position where the hole will be drilled from inside the cab. Locate the hole either 109 mm (4.3 in) or 545 mm (21.4 in) outboard from the center line of the back panel and 42 mm (1.65 in) below the horizontal sheet metal panel.
  6. Drill a 9 mm (3/8 in) hole through the sheet metal from inside the cab. Use a drill stop to prevent damage to the pickup box.
  7. Place the washer on the bolts.
  8. Apply a bead sealer around the hole in the washer.
  9. Using a clamping tool, feed the bolts through the hole from the outside of the cab.

  10. Object Number: 156687  Size: SH

    Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  11. Thread the nut on the bolts. Hold the bolt head with an extended length wrench.
  12. Tighten
    Tighten the nut to 30 N·m (22 lb ft).

  13. In the extended cab, if the length of the bolts interferes with the rear seat in the folded position, saw off the end of the bolts. Leave at least 2 threads visible from the end of the nut.
  14. If the child seat anchorage is removed, properly reseal the 9 mm (3/8 in) diameter hole.
  15. Install the seat. Refer to Front Seat Replacement - Bucket in Seats.