Mitsubishi 2010 RVR Owner's Manual page 67

Seat and restraint systems
3. To activate the ALR child restraint installation function,
slowly pull the shoulder part of the belt all the way out of
the retractor until it stops. Then let the belt feed back into
the retractor.
2
4. After the belt has retracted, tug on it.
If the belt is in the ALR function, you will not be able to
pull it out. If the webbing can be pulled out from retractor,
the ALR function has not been activated and you will
need to repeat steps 3 and 4.
2-40
5. After confirming that the belt is locked, grab the shoulder
part of the belt near the buckle and pull up to remove any
slack from the lap part of the belt allowing the slack to
feed into the retractor. Remember, if the lap belt portion is
not tight, the child restraint system will not be secure. It
may help to put your weight on the child restraint system
and/or push on its seatback while pulling up on the belt
(See illustration).