Dodge 2012 Challenger SRT8 Owner's Manual page 52

50 THINGS TO KNOW BEFORE STARTING YOUR VEHICLE
5. Position the shoulder belt on your chest so that it is
comfortable and not resting on your neck. The retractor
will withdraw any slack in the belt.
Removing Slack From Belt
6. To release the belt, push the red button on the buckle.
The belt will automatically retract to its stowed position.
If necessary, slide the latch plate down the webbing to
allow the belt to retract fully.
WARNING!
A frayed or torn belt could rip apart in a collision and
leave you with no protection. Inspect the belt system
periodically, checking for cuts, frays, or loose parts.
Damaged parts must be replaced immediately. Do
not disassemble or modify the system. Seat belt
assemblies must be replaced after a collision if they
have been damaged (bent retractor, torn webbing,
etc.).