Front Door Latch And Lock Actuator Removal/Installation
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2. Disconnect the negative battery cable..
3. Remove the following parts:
a. Inner garnish.
b. Front door trim.
c. Front inner handle.
d. Front door speaker.
e. Front door glass.
f. Front door module panel.
4. Remove the service hole cover (with front door key cylinder).

5. Remove the tab, then remove the door lock-link bracket (with front door key cylinder).

6. Disconnect the key rod from the front outer handle bracket.

7. Remove the screw.

8. Detach the clips.
9. Press down the rod holder of the front door latch and lock actuator in the direction of the arrow.

10. Maintaining the condition in Step 9, remove the front door latch and lock actuator.

11. Install in the reverse order of removal.
Test yourself
A quick Mazda 3 quiz: every answer comes with an explanation and a link to the manual page.