Seats and Restraints
Reclining Seatbacks
In this manual: Seats and Restraints
~1min read
The shoulder belt cannot do its job because it will not be against your body. Instead, it will be in front of you. In a crash, you could go into it, receiving neck or other injuries.
The lap belt cannot do its job either. In a crash, the belt could go up over your abdomen. The belt forces would be there, 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 seat and wear the safety belt properly.

Test yourself
A quick GMC Sierra quiz: every answer comes with an explanation and a link to the manual page.
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