
The vehicle has a shoulder belt height adjuster for the driver and right front passenger seating positions.
Adjust the height so the shoulder portion of the belt is on the shoulder and not falling off of it. The belt should be close to, but not contacting, the neck. Improper shoulder belt height adjustment could reduce the effectiveness of the safety belt in a crash. See How to Wear Safety Belts Properly.

To move it down, press the release button and move the height adjuster to the desired position.
After the adjuster is set to the desired position, try to move it down without pressing the release button to make sure it has locked into position.
Chevrolet Sonic. Additional Factors Affecting System Operation
Safety belts help keep the passenger in position on the seat during vehicle maneuvers
and braking, which helps the passenger sensing system maintain the passenger airbag
status. See “Safety Belt ...
Chevrolet Sonic. Compact Spare Tire
Warning
Driving with more than one compact spare tire at a time could result in loss
of braking and handling. This could lead to a crash and you or others could be injured.
Use only one compact s ...
Chevrolet Sonic. Safety Belts
This section of the manual describes how to use safety belts properly. It also
describes some things not to do with safety belts.
Warning
Do not let anyone ride where a safety belt cannot be worn ...