Warning
Sitting in a reclined position when the vehicle is in motion can be dangerous. Even when buckled up, the safety belts cannot do their job.
The shoulder belt 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 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.

Do not have a seatback reclined if the vehicle is moving.
Manual Reclining Seatbacks
Warning
If either seatback is not locked, it could move forward in a sudden stop or crash. That could cause injury to the person sitting there.
Always push and pull on the seatbacks to be sure they are locked.

To recline the seatback:
To return the seatback to the upright position:
Power Reclining Seatbacks

To adjust a power seatback, if equipped:
Seat Adjustment, Power Seat Adjustment, Lumbar Adjustment
Heated Front SeatsChevrolet Captiva Owners Manual > Vehicle Checks: Starter Switch Check, Automatic Transmission Shift Lock Control Function Check
Starter Switch Check
Warning
When you are doing this
inspection, the vehicle could
move suddenly. If the vehicle
moves, you or others could be
injured.
Before starting this check, be
sure there is enough room
around the vehicle.
Apply both the parking brake
and the regular brake.
...