Multicontour/dynamic seat, malfunctions
Topic number

LI91.25-P-059392

Version

2

Design group

91.25 Multicontour seat (MKS), dynamic seat

Date

01-10-2017

Validity

Model series W/V 221 with SA code 406 or 409 or 432 as
of VIN 221...106647 up to VIN 221...134746
Model series 216 with SA code 409 or 432 as of VIN 216.
..002723 up to VIN 216...006715

Reason for change

Damage code deleted

Reason for block

Complaint:

No inflation of one or more air cushions on the massage/multicontour/dynamic seat modules (driver, front passenger
and rear).
Bubble formation in one or more seats with massage/multicontour/dynamic seat modules (driver, front passenger and
rear).

Cause:

Valves (Figure 9) in the cushion/backrest pads can operate by themselves.
Depending on the switch position of the valve, this can result in either non-inflation or over-inflation of air cushions without any action by the driver.

Attachments
File

Description

Ventile_MKS_FDS_Einlage.JPG

(9) Ventile der Multikontur/ Fahrdynamik-Einlagen - Valves of multicontour / dynamic seat pads

Remedy:

General note prior to commencing the remedial action:
The comfort functions control units in the backrest and the pneumatic pump may only be replaced when all the checks
described below have been performed without success and the malfunctions continue to exist.
The control unit under the seat cushion is not integrated in the comfort system and must not under any circumstances
be replaced in connection with these complaints.
The malfunctions to which this document refers (within the specified VIN range) are caused by the faulty transistors in
the valves and not by the control units or the pneumatic pump.
The control unit programming described at the end must be performed in all cases.
The fault memory of the vehicle must first be read out via the DAS quick test and analyzed as follows for all seats.
For the front multicontour/dynamic seat pads in the backrest (Figures 4 and 7) and cushions (Figures 5 and 8) and for
the multicontour pads in the rear (Figure 2):
The faulty valves can cause fault codes in the following control units:
* Left front dynamic seat (present in 221 and 216)
* Right front dynamic seat (present in 221 and 216)
* Left rear multicontour backrest (present in 221 only)
* Right rear multicontour backrest (present in 221 only)
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* Dynamic seat pump (present in 221 and 216)
If there are faulty valves in a pad (also referred to as a module carrier), the following fault codes may be stored in the
relevant control units (left and right front dynamic seat, left and right rear multicontour backrest):
* 9210 "System failure of backrest module carrier" in the case of a defective multicontour/dynamic seat pad (module
carrier) in the backrest
* 9211 "System failure of cushion module carrier" in the case of a defective multicontour/dynamic seat pad (module
carrier) in the cushion
If these fault codes are found, the corresponding multicontour/dynamic seat pads (module carriers) in the relevant
seats must be replaced.
Please note: On the front seats, the pads (module carriers) in the backrest (pictures 4 and 7) and cushion (pictures 5
and 8) for the multicontour/dynamic seat function can be replaced separately. On the rear seat, however, the entire
backrest pad (Figure 2) must be replaced because in this case the corresponding modules are permanently integrated.
The following fault codes may be stored in the control units even for seats that are not affected:
* 9306 "Pump error"
* 9307 "Pump inactive".
These fault codes are caused by the automatic shutoff of the pneumatic pump. In these cases, therefore, do not replace any components on the associated seats.
For the massage pads at the front (only with SA code 432, Figures 3 and 6) and at the rear (only with SA code 406,
Figure 2):
1)
Faulty valves in the massage pads may cause the fault code 9202 "The module carrier for the massage function is
defective" in the following control units:
* Left front dynamic seat (present in 221 and 216)
* Right front dynamic seat (present in 221 and 216)
* Left rear multicontour backrest (present in 221 only)
* Right rear multicontour backrest (present in 221 only)
If these fault codes are found, the corresponding massage pads in the relevant seats must be replaced.
Please note: The massage pad in the front seats is permanently integrated in the backrest pad, so the entire backrest
pad must be replaced (cf. picture 1 and 3). As mentioned above, the same applies for the massage pads in the rear
seats (cf. picture 2).
2)
Furthermore, faulty valves in the massage pads may cause the following fault codes in the dynamic seat pump control
unit:
* 9251 "Pressure loss detected due to a leak"
* 9250 "Pressure buildup not possible due to a leak"
If these fault codes occur in one of the dynamic seat/multicontour seat control units in the seats without the above
fault code 9202, it is not possible to immediately identify the defective massage pad.
In this case, therefore, the test steps described below must be followed until the faulty massage pad is found (it is best
to begin with the front seats):
2.1) The fault memory of the pump control unit (dynamic seat pump) must first be erased.
2.2) Each seat with massage function must then be isolated from the pneumatic system. Each seat has a separable
connector which must be used for this purpose. On the front seats the separable connectors are accessed by removing the rear seat lining. On the rear seats these connectors are located behind the backrests. The separation point
leading to the pump must be sealed with a blind plug (A 124 805 02 44). The system must then be pressurized for at
least 5 minutes (during this time do not operate any pneumatic functions otherwise the pump control unit will not register the random air consumption).
2.3) If the seat with faulty massage function is isolated from the system, no fault is stored in the pump because no
random air loss is detected. This identifies the faulty massage pad.
Then replace the appropriate backrest pad (with integrated massage pads) of the seat identified as faulty.
Important additional note:
The following fault codes may also be stored in the control unit of the pneumatic pump (dynamic seat pump):
* 9180 "Pressure supply shut off via CAN signal from MCMS_FL"
* 9181 "Pressure supply shut off via CAN signal from MCMS_FR"
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* 9182 "Pressure supply shut off via CAN signal from MCMS_RL"
* 9183 "Pressure supply shut off via CAN signal from MCMS_RR"
If one or more of these faults is stored in the pump control unit and if the faulty parts cannot be replaced immediately, the entire pneumatic system must be decommissioned by deactivating the pump via DAS (menu item "Commissioning"). Under no circumstances should be fault memory be erased and the system recommissioned without first replacing the faulty parts or deactivating the pump.
The same applies in the case of significant overinflation of one or more air cushions (bubble formation).
After replacing the faulty module carrier for the massage/multicontour/dynamic seat function, control unit programming
must be performed using DAS on the left/right front dynamic seat, left/right rear multicontour backrest and dynamic
seat pump control units.

Symptoms
Body / Seat / Multicontour seat / Nonfunctional
Body / Seat / Active multicontour seat / Nonfunctional

Control unit/fault code
Control unit

Fault code

Fault text

DS-LF-Left front dynamic seat 9210
(FDSVL2)

The module carrier for the backrest is defective. (((ECU1_DV_
HEX@0100-)))

DS-RF-Right front dynamic se- 9306
at (FDSVR2)

Event:Control unit DSP is switched off due to a fault.

DS-RF-Right front dynamic se- 9307
at (FDSVR2)

Event:Control module DSP is not activated.

DS-RF-Right front dynamic se- 9251
at (FDSVR2)

Leakage at an air cushion-Left air cushion for lateral support
((ECU_FDSVR2_DEF_FDS und Massage@aktiv,(ECU1_DV_
HEX@0002-ECU1_DV_HEX@0005)))

DS-RF-Right front dynamic se- 9251
at (FDSVR2)

Leakage at an air cushion-Inflatable cushion for lateral support
(((ECU1_DV_HEX@0002-ECU1_DV_HEX@0005),not(ECU_
FDSVR2_DEF_FDS und Massage@aktiv)))

DS-RF-Right front dynamic se- 9250
at (FDSVR2)

Leakage at an air cushion-Inflatable cushion in shoulder area
(((ECU1_DV_HEX@0002-ECU1_DV_HEX@0005)))

DS-LF-Left front dynamic seat 9211
(FDSVL2)

The module carrier for the seat cushion is defective. (((ECU1_
DV_HEX@0100-)))

DS-LF-Left front dynamic seat 9306
(FDSVL2)

Event:Control unit DSP is switched off due to a fault.

DS-LF-Left front dynamic seat 9307
(FDSVL2)

Event:Control module DSP is not activated.

DS-LF-Left front dynamic seat 9251
(FDSVL2)

Leakage at an air cushion-Left air cushion for lateral support
((ECU_FDSVL2_DEF_FDS und Massage@aktiv,(ECU1_DV_
HEX@0002-ECU1_DV_HEX@0005)))

DS-LF-Left front dynamic seat 9251
(FDSVL2)

Leakage at an air cushion-Inflatable cushion for lateral support
(((ECU1_DV_HEX@0002-ECU1_DV_HEX@0005),not(ECU_
FDSVL2_DEF_FDS und Massage@aktiv)))

DS-LF-Left front dynamic seat 9250
(FDSVL2)

Leakage at an air cushion-Inflatable cushion in shoulder area
(((ECU1_DV_HEX@0002-ECU1_DV_HEX@0005)))

DS-RF-Right front dynamic se- 9210
at (FDSVR2)

The module carrier for the backrest is defective. (((ECU1_DV_
HEX@0100-)))

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DS-RF-Right front dynamic se- 9211
at (FDSVR2)

The module carrier for the seat cushion is defective. (((ECU1_
DV_HEX@0100-)))

Parts
Part number

ES1 ES2 Designation

Quantity Note

EPC

A 216 910 32 16

Right seat pad

1

X

A 216 910 34 16

Right seat pad

1

X

A 216 910 15 75

Padding in right backrest (SA
code 409)

1

X

A 216 910 16 75

Padding in right backrest

1

X

A 216 910 14 75

Right seat padding

1

X

A 216 910 31 16

Left seat pad

1

X

A 216 910 33 16