S12. Written instructions. The vehicle must provide written instructions, in English, for using the tether anchorages and the child restraint anchorage system in the vehicle. If the vehicle has an owner's manual, the instructions must be in that manual. The instructions shall:
(a) Indicate which seating positions in the vehicle are equipped with tether anchorages and child restraint anchorage systems;
(b) In the case of vehicles required to be marked as specified in paragraphs S4.1, S9.5(a), or S15.4, explain the meaning of markings provided to locate the lower anchorages of child restraint anchorage systems; and
(c) Include instructions that provide a step-by-step procedure, including diagrams, for properly attaching a child restraint system's tether strap to the tether anchorages.