1997 GMC Sonoma Owner's Manual - Page 12
1997 GMC Sonoma Manual
Page 12 highlights
1 A CAUTION: Sitting in a reclined position when your vehicle is if in motion can be dangerous. Evenyou buckle up, your safety belts can't do their job when you're reclined like this. The shoulder belt can't do job because it its won't be against your body. Instead, it will bein front of you. In a crash you could gointo it, receiving neckor other injuries. The lap belt can't do job either. In a crash the its belt couldgo up over your abdomen. The belt forces would bethere, not at your pelvic bones. This could cause serious internal injuries. For proper protection when the vehicle is in motion, have the seatback upright. Then sit well back in the seatand wear your safety belt properly. But don't have a seatback reclined vehicle is moving. if vow 1-4