Summary table for ISOFIX child seat installation
In accordance with European legislation, the table below shows the ISOFIX child seat installation options in the vehicle on seats equipped with ISOFIX anchorages.
For universal and semi-universal ISOFIX child seats, the ISOFIX size class of the child seat, marked with a letter from A to G, is shown on the child seat next to the ISOFIX logo.

IUF: seat suitable for installing universal ISOFIX child seats (F) 'facing forward', secured with the TOP TETHER top tether strap.
IL-SU: seat suitable for installing ISOFIX semi-universal child seats (S):
- 'facing rearward', equipped with a top tether or support leg,
- 'facing forward', equipped with a support leg,
- carrycot equipped with a top tether or support leg.
To attach the top tether, see the section 'ISOFIX anchorages'.
X: position not suitable for installing an ISOFIX child seat or carrycot in the given weight group
Remove and store the head restraint before installing a child seat with a backrest on the passenger seat. Refit the head restraint after removing the child seat.Test yourself
A quick Citroen DS3 quiz: every answer comes with an explanation and a link to the manual page.