52 16 055 Replacing an air cushion for backrest width adjustment (M3 sport pack) on left or right

Necessary preliminary tasks 

• Remove REAR PANEL ON FRONT SEAT 
• Partially remove BACKREST COVER 

Color coding for air cushion, backrest width adjustment: 

1. Yellow air hose = air supply, left air cushion for backrest width adjustment
2. Brown air hose = air supply, right air cushion for backrest width adjustment

Unlock and detach quick connector from yellow or brown air hose (1) or (2).

Fig 1: Identifying Yellow/Brown Air Hose

Courtesy of BMW OF NORTH AMERICA, INC.

Unclip carrier for backrest width adjustment from backrest frame.

Feed carrier with air hose out of backrest frame.

Installation: 

Make sure the carrier for backrest width adjustment is fitted correctly on the backrest frame.

Install air hoses without kinks.

Fig 2: Feeding Carrier With Air Hose Of Backrest Frame

Courtesy of BMW OF NORTH AMERICA, INC.