LI91.10-P-049799 Service Bulletin/Repair Instructions

}{ENT R. Y

Quiescent current in seat control unit

Topic number
Ll91.1 O-P-049799
Version
2
Design group
91.10 Front seats
Date
07-10-2014
Validity
Model series 203, 209, 210, 211
Reason for change
WIS reference added
Reason for block
Complaint:

Quiescent current in seat control unit.

Cause:

The presence of a quiescent current can have several causes.

These are not always recognized and lead to an increased number of OK components being removed.

Possible Hall sensor faults or normalization faults can exist which can be eliminated without replacing the control unit.

Remedy:

Work through the following test procedure:

1. Power consumption:

Power consumption must be tested using a multimeter.

Quiescent current (CAN not active, the following voltages must be measured (10 V UBatt 15 V):

No-load current (CAN not active, backrest not folded, no seat adjustment): 300 µA

No-load current (CAN not active, backrest folded, no seat adjustment): 20 mA

Operating current (CAN active, no seat adjustment): 200 mA

Should the currents be outside the values described above, the following connectors should be removed in sequence.

Connector 11 (violet): Dynamic seat (FDS) if installed

Connector 8 (transparent): Height release switch (HES)

Connector 7 (pink): Backrest release switch (LES)

Connector 6 (orange): Backrest/head restraint motor (UK)

Connector 5 (brown): Inclination adjustment (height at front) (HV)

Connector 4 (black): Fore/aft adjustment (LV)

Connector 3 (green): Height adjustment (height at rear) (HH)

Connector 1 (black): CAN and steering column (CAN, LS)

If after disconnecting all the above listed connectors the current is outside the defined values, the seat control unit

must be replaced.

2. Normalization faults

If a normalization fault is stored without the corresponding Hall sensor fault, an adjustment for this adjustment shaft

must be performed in both directions. This ensures that after an inadvertent erasure of the Hall sensor fault this is set

again.

If the Hall sensor fault is not stored following adjustment in both directions, it is sufficient to carry out a new normalization.
If a Hall sensor fault is stored, see chapter "Hall sensor faults".

3. Hall sensor faults

If Hall sensor faults are stored, the current status of the seat control unit is recorded first. The following information is

read out for this purpose:

Normalizing position of all shafts (except steering column, is not normalized}

07-10-2014 3:28 PM

©Copyright Daimler AG
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Actual position of all shafts

fault

Read the switch status for the release switch (note: seat adjustment is not possible if the backrest has been released)

The following test must be carried for all shafts with Hall sensor faults:

Read status (see "Read status")

Erase fault

Move adjustment shaft for> 2 sec

Read status (see "Read status")

Move adjustment shaft for > 2 sec in opposite direction

Read status (see "Read status")

If Hall sensor faults are present after the test sequence, for these adjustment shafts the contacting must be checked

for loose contact and the lines for short circuits.

Hall sensor signal line: check for short circuit to UBatt and ground

Hall sensor ground line: check for short circuit to UBatt

Motor lines: check for short circuit lo UBatt

All resistance measurements must be > 1 Mohm

If the wiring harnesses and connections were found to be OK, the seat control unit must be replaced.
Symptoms

Body I Seal I Seat adjustment I Function error

Overall vehicle I Power supply I Battery/On-board electrical system I Battery function I Battery discharges
Control unit/fault code

Control unit
Fault code
Fault text
ESA passenger-Electric seat adjustment front passenger

(with memory) (ESVB1) (CLK

(209),C (203),E (211))
-
-
Parts

Part number
ES1 ES2
EPC Other

make

part
Designation
Quantity Note
A2118704626
Control unit
1
Left seat control unit
A2118704726
Control unit
1
Right seat control unit
x

x
Work units

Op. no.
Operation text
Time
Damage

code
Note
82475 54
Seat adjustment control unit
WIS-References

Document number
Title
ar54.1 O-p-1030-03p
Check no-load current
07-10-2014 3:28 PM

©Copyright Daimler AG
Note
Allocation

Remedy
PLUBONS

Page 2118
HE NT RY

Validity

Vehicle
Engine
Transmission
203.004
•
203.006

203.007

203.008

203.016
•
•

•

•

•
203.018

203.020

203.035

203.040

203.042

203.043

203.045

203.046

203.052

203.054

203.056

203.061

203.064

203.065

203.076

203.081

203.084

203.087

203.092

203.204

203.206

203.207

203.208

203.216

203.218

203.220

203.235

203.240

203.242

203.243

203.245

203.246

203.252

203.254

203.256

07-10-2014 3:28 PM

© Copyright Daimler AG
rn
•

•
.

•

•

•

•

•
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•

•

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•

•

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•

•

•

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•

•

•

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•

•

•

•

•

•
.
.
•

•

•

•

•

•

•

•

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•

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•
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•
PLUBONS

Page
3/18
. lC ENTRY

•
203.261

203.264
.
203.265

203.276
•

•

•

•

•
203.281

203.284

203.287

203.292

203.706

203.707

203.708

203.718

203.735

203.740

203.741

203.742

203.743

203.745
.

•

•
•

•

•

•

•
•

•

•
203.746
•
203.747

203.752
•

•

•

•
•

•

•

•

•

•

•

•

•

•

•

•

•
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•

•

•

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•

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•
•
•
•
Vehicle
Engine
Transmission
203.004

203.004

203.004

203.004

203.004
611.962
716.601

716.603

716.604

722.619

722.699

716.640

716.647
203.756

203.764

CLK (209)

E (210)

E (211)
Full model designation breakdown
203.006

203.006

203.006

203.006

203.007
611.962

611.962

611.962

611.962

611.962

611.962

611.962

611.962

646.962
203.007
646.962
203.007
646.962

646.963
203.007
07-10-2014 3:28 PM

©Copyright Daimler AG
716.651

722.699

716.604

716.606

722.699

716.604
PLUBONS
Page 4/18
· lC ENT RY

203.007

203.007
646.963

646.963
716.606

722.699
203.008

203.008

203.008

203.016

203.016

203.016
646.963

646.963

646.963

612.962

612.962
716.649

716.654

722.699

716.641

716.648

716.649
203.016
612.962

612.962
716.654
203.016

203.016
612.962

612.962
722.634

722.640
203.018

203.020

203.020
722.642

716.653

722.902
203.035

203.035

203.035
612.990

642.910

642.910

111.951

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