Remove/Install Front Seat Lumbar Support Control Unit - AR91.25-P-1910S

Model 223 

with code U22 (Lumbar support adjustment) 

Fig 1: Front Seat Lumbar Support Control Unit Components Location - Model 223 With Code U22

Courtesy of MERCEDES-BENZ USA

Topical note	Information on preventing damage to electronic components due to electrostatic discharge		AH54.00-P-0001-01A
	Remove/install
1	Remove seat backrest trim.	Model 223 with code U22 (Lumbar support adjustment) except code 735 (Additional scope of trim elements)	AR91.10-P-1912SA
		Model 223 with code 735 (Additional scope of trim elements) with code U22 (Lumbar support adjustment)	AR91.10-P-1912S
2	Remove rear airbag.	Model 223 with code 302 (Tubular structure airbag for rear occupants) with code U22 (Lumbar support adjustment)
			AR91.60-P-0704S
3	Disconnect electrical connector (2) from lumbar support electropneumatic controller unit (N32/23, N32/24).
4	Disconnect pneumatic lines (1).	The pneumatic lines (1) are color coded.
5	Remove lumbar support electropneumatic controller unit (N32/23, N32/24).
6	Install in the reverse order