CL 550 (216.371) V8-5.5L (273.961) (2008)
Vacuum/Pressure Pump: All Technical Service Bulletins
Interior - Seat Air Cushion Doesn't Inflate
MULTI-CONTOUR/DYNAMIC SEAT AIR CUSHIONS NOT INFLATING OR BUBBLE FORMATION IN ONE OR MORE SEATS
Topic number
LI91.25-P-046797
Version
2
Design group
91.25 Multicontour seat (MCS)
Date
12-08-2009
Validity
Model 216.371/376/377/379/386, As of MY 07, VIN Range A002723 to A006715
Model 221.171/176/177/179/186, As of MY 07, VIN Range A106647 to A134746
Equipped with Option Code 406, 409 or 432 Multi-Contour Seats (MCS)
Reason for change
Left Front Seat Cushion Adapter and Right Front Seat Cushion Adapter part designations switched / Supersedes DTB P-B-91.25/169a
Reason for block
Complaint:
Multi-contour/Dynamic Seat Air Cushions Not Inflating or Bubble Formation in One or More Seats
Cause:
Inoperative transistors in the valve electronics (Figure 1).
Note:
Depending on the switch position of the valve, the air cushions may either over-inflate or not inflate at all even without interaction by the driver. To
remedy, follow the procedures below based on the specified fault code.
Attachments
Remedy:
Note:
Read the notes below very carefully prior to performing any repairs.
^ The comfort functions control units in the backrest of the pnuematic pump may only be replaced when all diagnostic and verification steps below are
performed and the inoperative conditions are present.
^ Do not replace the control unit under the seat cushion. It is not integrated in the comfort system and cannot cause any of the conditions referenced
above.
^ These specific conditions may only be caused by the valve electronics, and not by the pnuematic pump or the control unit.
^ DTC memory read-out and control unit programming must be performed in all cases.
Condition 1:
Check for the following stored DTCs in front left and right dynamic seat and rear left and right Multi-contour Backrest (Figures 2 and 3). Should either
of these codes be present, replace the corresponding unit.
DTC 9210: "System failure of Backrest Module Carrier"