Head restraintsHead restraints - Seat and seat belts - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

► Driving without the head restraints in place can cause you and your passengers Warning

► Driving without the head restraints in place can cause you and your passengers serious injury or death in an accident. To reduce the risk of injury in an accident, always make sure the head restraints are installed and properly positioned when the seat is occupied.
► Never place a cushion or similar device on the seatback. This can adversely affect head restraint performance by increasing the distance between your head and the restraint.

See also:

Other specifications
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Adjusting head restraint forward or backward (Front seat only)
Tilt the head restraint forward to adjust it forward. To adjust it backward, tilt the head restraint backward. ...

To lock without using the key
Set the inside lock knob (1) to the locked position, and close the door (2). Note ► The driver’s door cannot be locked using the inside lock knob while the driver’s door is opened. ...