1. Disconnect the negative battery cable..
2. Remove the trunk lid trim..
3. Lift the clip in the direction of the arrow (1), and pull out the key rod in the direction of the arrow (2).

4. Remove the nuts.

5. Remove the trunk lid key cylinder.
6. Install in the reverse order of removal.
Trunk Lid Adjustment
Trunk Lid Latch And Release Actuator InspectionCrankshaft Position (CKP) Sensor Removal/Installation [Mzr 2.0, Mzr 2.5]
Removal
CAUTION:
When foreign material such as an iron chip is on the CKP sensor, it can cause
abnormal output from the sensor because of flux turbulence and adversely affect
the engine control. Be sure there is no foreign material on the CKP sensor when
replacing.
Do not a ...
Contact Authorized Mazda Dealer and Have Vehicle Inspected
If any of the following warning lights or the indicator light turns on/flashes, the system may
have a malfunction. Contact an Authorized Mazda Dealer to have your vehicle
inspected.
...
Blind Spot Monitoring (BSM) System
The Blind Spot Monitoring (BSM) system is designed to assist the driver in
checking the
area to the rear of the vehicle on both sides during lane changes by alerting
the driver to the
presence of vehicles approaching from the rear in an adjacent lane.
The Blind Spot Monitoring (BSM) system ...