To installTo install  - Installing a child restraint system to the lower anchorage (ISOFIX child restraint 
mountings) and tether anchorage - Child restraint - Seat and seat belts - Mitsubishi Lancer Owner's Manual - Mitsubishi Lancer

1. Remove any foreign material in or around the connectors and ensure the vehicle seat belt is in its normal storage position.
2. Push the child restraint system’s connectors (A) into the slit (B) in accordance with the instructions provided by the child restraint system’s manufacturer.

A- Connector

A- Connector
B- Slit
C- Vehicle seatback
D- Vehicle seat cushion
E- Lower anchorage

If your child restraint system requires the use of a tether strap, fasten the tether strap in accordance with steps 3 through 4.

3. Remove the head restraint from the location in which you wish to install a child restraint.
4. Latch the top tether strap hook (F) of the child restraint system to the tether anchorage bar (G) and tighten the top tether anchorage strap so it is securely fastened.

5. Push and pull the child restraint system in all directions to be sure it is

5. Push and pull the child restraint system in all directions to be sure it is firmly secured.

    See also:

    Chassis number
    The chassis number is stamped on the bulkhead as shown in the illustration. ...

    SRS warning lamp/display
    Warning lamp The warning lamp/display illuminates when there is a fault with the system. In addition, the warning display will be displayed on the information screen in the multi-information di ...

    Vehicle identification number plate (RHD vehicles only)
    The vehicle identification number is stamped on the plate riveted to the left front corner of the vehicle body. It is visible from outside of the vehicle through the windscreen. ...