The ELR has a spring that will unwind if the retractor's cover is removed. The spring cannot be rewound by hand. If this occurs, the ELR will not work properly. Therefore, do not disassemble the retractor.
4SD
1. Fold the rear seat back.
2. Remove the rear package trim.
3. Remove the bolt.
4. Remove the rear center seat belt.
5. Install in the reverse order of removal.
5HB
1. Remove the rear scuff plate.
2. Remove the tire house trim.
3. Remove the trunk side upper trim.
4. Remove the C-pillar trims.
5. Remove the bolts.
6. Remove the rear center seat belt.
7. Install in the reverse order of removal.
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Test yourself
A quick Mazda 6 quiz: every answer comes with an explanation and a link to the manual page.