1998 GMC Sonoma Owner's Manual - Page 57

5. Pull the rest of the shoulder beltall the way out of the retractor to set the lock. 6. To tighten the belt, feed the shoulder belt back into the retractor while you push down on the child restraint. If you're using a forward-facingchild restraint, you may find it helpful to use your knee to push down on the child restraint as you tighten the belt. 1-43