S 550 (221.171) V8-5.5L (273.961) (2007)
2.
Disconnect feed line and close off with stop plug (part # A 124 805 02 44) as shown in Figure 4.
3.
Perform leak test.
^
Follow the DAS menu Pump control unit-> Complete list of guided tests-> Check entire system for leaks."
4.
Perform one of the following, depending on results of leak test in previous step:
^
If no pressure loss is detected: Perform Procedures G and H.
^
If pressure loss is detected: Repeat procedure on right rear seat.
D.
REPLACE BACKREST AIR CUSHION INSERT (FRONT AND REAR SEATS)
1.
Remove cover of affected seat backrest; refer to one of the WIS documents shown above.
2.
Replace air cushion insert in affected multicontour seat backrest.
Note:
^
Rear seats: In the event of malfunctioning parts in the rear backrest, the complete padding of the rear backrest must be replaced.
^
Front seats: Ensure that the air cushion inserts for the massage functions are securely integrated into the front seat backrest padding. The
multicontour/dynamic function is implemented by a separate air cushion insert located under the backrest padding, and can be replaced
separately.
3.
Reinstall backrest cover; refer to appropriate WIS document from step 1.
4.
Proceed to Procedure I.
E.
REPLACE FRONT SEAT CUSHION INSERT
1.
Remove cover of affected front seat cushion; refer to one of the following WIS documents:
^
Front seat cushion cover (Model 216): AR91.18-P-1800SC.
^
Front seat cushion cover (Model 221): AR91.18-P-1800SX.
2.
Replace seat cushion insert in affected multicontour seat.
3.
Reinstall seat cushion cover; refer to appropriate WIS document from step 1.
4.
Proceed to Procedure I.