Cadillac 2007 SRX Owner's Manual page 40

Here is how to install the comfort guide to the
shoulder belt.
1. Slide the guide off of its storage clip located
on the seatback.
2. Slide the guide under and past the belt. The
elastic cord must be under the belt. Then,
place the guide over the belt and insert
the two edges of the belt into the slots of
the guide.
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3. Be sure that the belt is not twisted and it lies
flat. The elastic cord must be under the belt
and the guide on top.