Starter Interlock Switch Removal/Installation

Disconnect the negative battery cable. (See NEGATIVE BATTERY CABLE DISCONNECTION/CONNECTION [SKYACTIV-G 2.0, SKYACTIV-G 2.5] .)
Disconnect the starter interlock switch connector.
Remove the starter interlock switch using the following procedure:
1. Detach hook A in the direction of the arrow shown in the figure.
  
  Fig 1: Identifying Starter Interlock Switch
  Courtesy of MAZDA MOTORS CORP.
2. Slide the starter interlock switch in the direction of the arrow shown in the figure.
  
  Fig 2: Sliding Starter Interlock Switch
  Courtesy of MAZDA MOTORS CORP.
3. Remove the starter interlock switch from the clutch pedal.
  
  Fig 3: Removing Starter Interlock Switch From Clutch Pedal
  Courtesy of MAZDA MOTORS CORP.
Install the starter interlock switch using the following procedure:
1. Insert hook B of a new starter interlock switch into the clutch pedal hole.
  
  Fig 4: Identifying Starter Interlock Switch, Clutch Pedal And Hole
  Courtesy of MAZDA MOTORS CORP.
2. While pressing the starter interlock switch against the clutch pedal, slide the starter interlock switch until hook A is locked in the direction of the arrow shown in the figure.
  
  Fig 5: Sliding Starter Interlock Switch
  Courtesy of MAZDA MOTORS CORP.
Fully depress the clutch pedal in the direction of arrow, and verify that a click sound from the starter interlock switch is heard.
Install in the reverse order of removal.
Fully depress the clutch pedal, and verify that the engine starts.

Fig 6: Pressing Clutch Pedal
Courtesy of MAZDA MOTORS CORP.