Rear side seat belt remove in the following order.
1. Remove the rear seat cushion (see "Removing and installing the rear seat").

2. Pry it up with a screwdriver…

3. …and remove the plug from the lower belt mounting bolt.

4. Remove the lower seat belt mounting bolt.

5. Pry it up with a screwdriver…

6. …and remove the decorative trim from the upper mounting loop.

7. Unscrew the hinge mounting bolt and remove the hinge together with the bolt and spacer washers.

8. Remove the belt reel mounting bolt.

9. Pry up the belt guide.

10. Pass the belt with the guide and the upper loop through the hole in the rear pillar trim…

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11. …and remove the rear side seat belt.

Note: This is what the rear side seat belt looks like.
Rear seat belt buckles and rear center seat belt shoot in the following order.
12. Remove the rear seat back (see "Removing and installing the rear seat").

13. Unscrew the mounting bolts…

14. …and remove the rear seat belt buckles and the rear center seat belt.
15. Install the seat belts in the reverse order of removal.
