To remove

Fold down the backrest.
Remove the backrest lock plastic covers as follows:
1. 2.a. Undo the front inner cover clip using a screwdriver.
  
  Fig 1: Removing Front Inner Cover Clip
  Courtesy of SAAB-SCANIA OF AMERICA, INC.
2. 2.b. Undo the front outer cover clip using a screwdriver.
  
  Fig 2: Removing Front Outer Cover Clip
  Courtesy of SAAB-SCANIA OF AMERICA, INC.
3. 2.c. Remove the side covers.
  
  Fig 3: Removing Side Covers
  Courtesy of SAAB-SCANIA OF AMERICA, INC.
4. 2.d. Undo the upper cover rear clips. Undo the outer clip first.
  
  Fig 4: Removing Upper Cover Rear Clips
  Courtesy of SAAB-SCANIA OF AMERICA, INC.
5. 2.e. Carefully lift up the cover.
  
  Fig 5: Lifting Up Cover
  Courtesy of SAAB-SCANIA OF AMERICA, INC.