Cadillac 2009 CTS - Manual (Page 36)

There is one guide for each outboard passenger
position in the rear seat. Here is how to install a
comfort guide to the safety belt:
1. Pull the elastic cord out from between the edge of
the seatback and the interior body to remove the
guide from its storage clip.
2. Place the guide over the belt and insert the two
edges of the belt into the slots of the guide.
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