Remove/install lumbar support air cushion of front seat backrest - AR91.25-P-1445LW

Model 205.0/1/2, 253 with code 221 (Electrically adjustable left driver seat) except code 555 (AMG Performance seats) 

Model 205.0/1/2, 253 with code 222 (Electrically adjustable right front seat) except code 555 (AMG Performance seats) 

Model 205.0/1/2, 253 with code 275 (Driver's seat, electrically adjustable with memory function) except code 555 (AMG Performance seats) 

Model 205.0/2, 253 with code 241 (Memory switch for electrically adjustable driver seat, left) except code 555 (AMG Performance seats) 

Model 205.0/2, 253 with code 242 (Front passenger seat, electrically adjustable with memory function) except code 555 (AMG Performance seats) 

Model 205.0/2, 253 with code P65 (Seat comfort package) except code 555 (AMG Performance seats) 

Fig 1: Identifying Lumbar Support Air Cushion Remove/Install Components - Shown On Removed Front Seat

Courtesy of MERCEDES-BENZ USA

Shown on removed front seat 

	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove cover (1) together with padding (2) from backrest		AR91.18-P-1820LW
		The front seat need not be removed. Do not remove cover (1) from padding (2).
2	Remove cable tie (4)
3	Unhook pneumatic pump for driver seat lumbar support (M25/4) or pneumatic pump for front passenger seat lumbar support (M25/5) with protective sleeve from cable tie on backrest frame	The pneumatic pump for driver seat lumbar support (M25/4) and pneumatic pump for front passenger seat lumbar support (M25/5) may not be removed from their protective sleeve.
4	Disconnect electrical connection for pneumatic pump for driver seat lumbar support (M25/4x1) or the electrical connection for pneumatic pump for front passenger seat lumbar support (M25/5x1)
5	Disconnect electrical connector (6)
6	Unhook driver seat lumbar support adjustment control unit (N32/23) or front passenger seat lumbar support adjustment control unit (N32/24) from spring element (5) and route forward between the backrest frame and spring element (5)
7	Route pneumatic pump for driver seat lumbar support (M25/4) or pneumatic pump for front passenger seat lumbar support (M25/5) forward, between backrest frame and spring element (5)
8	Mark installation position of air cushion unit (3) on the spring element (5)
9	Unhook and remove air cushion unit (3) from spring element (5)	Observe markings.
10	Install in the reverse order