Front Door Key Cylinder 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 door speaker.
d. Front door glass.
e. Front door module panel.
4. Remove the service hole cover.

5. Remove the tab, then remove the door lock-link bracket.

6. Remove the service hole cover.

7. Remove the screw from the service hole.
NOTE:The screw cannot be removed because of the stopper.

8. Lift the clip in the direction of the arrow (1), and pull out the key rod in the direction of the arrow (2).

9. Press the tab on the front outer handle bracket in the direction of the arrow.

10. Maintaining the condition in Step 9, remove the front key cylinder.

11. Using a tape-wrapped fastener remover, press up the collar cap in the direction of the arrow shown in the arrow, press aside the front door key cylinder tabs (1), and remove the collar cover from the front door key cylinder.

12. 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.