The side air bag sensor is attached to the lower part of the B-pillar. When working around the B-pillar, disconnect the negative battery cable or work carefully, avoiding excessive impact to the lower part of the B-pillar.
1. Remove the following parts:
a. Front scuff plate.
b. Rear scuff plate.
c. B-pillar lower trim.
d. Front seat belt upper anchor installation bolt.
e. B-pillar upper trim.
2. Remove the bolt.
3. Remove the adjuster anchor.
4. Install in the reverse order of removal.
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Test yourself
A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.