The rear armrest in the center of the rear seatback can be used (no occupant in the center seat) or placed upright.

WARNING
Never put your hands and fingers around the moving parts of the seat and armrest:
Putting your hands and fingers around the moving parts of the seat and armrest is dangerous as they could get injured.
Split Folding
Head RestraintsMazda 6 Owners Manual: Rear seat removal/installation
4SD
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
5HB
1. Remove in the order indicated in the table.
2. Install in the reverse order of removal.
Remote wire removal note
1. Turn over the trunk floor mat.
2. Remove the case.
3. Remove the ...
Mazda 6 Owners Manual: Dtc clearing procedure
1. Start the on-board diagnostic test mode.
2. First press the POWER button, then simultaneously press AUDIO CONT button
for 2 seconds or more.
Caution
Before clearing the DTCs, be sure to enter all of them displayed
in the on-board diagnostic test mode in the Audio Repair Order Form. ...