1. Remove the screws.
2. Remove the rear flap.

3. Install in the reverse order of removal.
Front flap removal/installation
Rear door garnish removalMazda 6 Service Manual: Air bag module and pre-tensioner seat belt disposal procedures
Warning
Before scrapping a vehicle with a live (undeployed) air bag module
and pre-tensioner seat belt, deploy the air bag module and pre-tensioner
seat belt. Never dispose of a live (undeployed) air bag module and pre-tensioner
seat belt.
The air bag module and the pre-tensioner seat ...
Mazda 6 Service Manual: Control valve body removal
On-Vehicle Removal
Warning
Using compressed air can cause dirt and other particles to fly
out, causing injury to the eyes. Wear protective eyes whenever using
compressed air.
Caution
Clean the transaxle exterior throughout with a steam cleaner or
cleaning solvents before removal ...