Campaign No. 2020080012 August, 2020

TO:

ALL MERCEDES-BENZ CENTERS

SUBJECT:

Model 907 Model Year 2019-2020
Clean SRS CU Contacts

Mercedes-Benz AG (“MBAG”), the manufacturer of both Mercedes-Benz and Freightliner vans, has
determined that on certain Sprinter vehicles (platform 907), an intermittent connection may occur between
the connector block of the electronic control unit and the connector pins for the Supplemental Restraint
System wiring harness (SRS wiring harness). The SRS control unit might detect increased resistance in
various ignition circuits (e.g. driver/front passenger airbag, seat belt tensioner) which could lead to
illumination of a warning message (yellow) and warning lamp (red) in the instrument cluster. The function
of the SRS is not impaired.

Prior to performing this Service Campaign:


Please check VMI to determine if the vehicle is involved in the Campaign and if it has been previously
repaired.



Please review the entire Service Campaign bulletin and follow the repair procedure exactly as
described.

Approximately 53,590 vehicles are affected.

Order No. V-SC-2020080012
This bulletin has been created and maintained in accordance with MBUSA-SLP S423QH001, Document and Data
Control, and MBUSA-SLP S424HH001, Control of Quality Records.

Model

907
with code ZU8 (National version for USA)

Operation no. of the operation texts or standard texts and flat rates
Category Op. no.
Operation text
Time
L
02 1857
Operation: Clean pins on SRS control unit, acc. no.: 1.3 hr
54 904 59, code: VS3ZKUSRS
L
02 2726
Operations: Disconnect/connect ground line of on- 0.2 hr
board electrical system battery (when working on
veh.)
L
02 2727
Operations: Disconnect/connect ground line of on- 0.1 hr
board electrical system battery (when working on
veh.) with code E30
1
2
3
A
B

Damage Code Code
54 904 59
VS3ZKUSR
S
54 904 59
VS3ZKUSR
S
54 904 59

VS3ZKUSR
S

Supplemental restraint system
(SRS) control unit
Testing tool
Testing tool
Range
Range

D91.60-A012-76

Topical note
Topical note

Notes on carrying out repair work
in the vehicle interior
Information on preventing damage
to electronic components due to
electrostatic discharge

V-SC-2020080012

AH68.00-N-0001-01S
AH54.00-P-0001-01A

1

g
1

2.1

Check
Check whether vehicle is affected
by measure.

Preparation
Prepare testing tools (2, 3).

i
Only the entry in the "Extended
VEGA Application" (EVA) system
in the "Current" tab is decisive for
authorized Mercedes-Benz service
partners. An additional test of the
affected vehicles in the workshop
information system (WIS) or
vehicle list is thereby not
necessary.
If testing tools (2, 3) have not yet
been prepared.
Page 5

2.2

Check testing tools (2, 3) for
condition and damage.

If testing tools (2, 3) are already
present.
p
Testing tools (2, 3) must be clean
and intact.
Otherwise, the SRS control unit (1)
will be damaged.
If one or both testing tools (2, 3)
are soiled or damaged:
↓
Prepare corresponding testing tool
(2, 3) again.
Page 5

e
3
f
4

m
5

Remove
Remove SRS control unit (1).

AR91.60-D-0622TSR

Put down SRS control unit (1) and l ESD kit
prepare as per instructions on
potential equalization.
Clean

Page 7

Clean pins on SRS control unit (1).
l ESD kit

2

000 589 52 98 00

V-SC-2020080012

000 589 52 98 00

Check

g
6

Check pins on SRS control unit (1) p
for damage.
The pins on the SRS control unit
(1) must not be damaged or bent.
Otherwise, the SRS control unit (1)
is defective.
i
Without any force, attach 104-pin
testing tool (2) and 20-pin testing
tool (3) in corresponding plug
housing of SRS control unit (1) up
to end stop and detach again.
The aim is to determine, using this
empty coupling housing, whether
the pins are OK and unbent after
cleaning. If the two testing tools (2,
3) can be inserted up to the end
stop without any force, the pins are
OK.
i
The 104-pin testing tool (2) must
line up with the housing edge of
the SRS control unit (1) in area (A)
during installation.
The 20-pin testing tool (3) must line
up with the housing edge of the
SRS control unit (1) in area (B)
during installation.
Then perform a visual check of the
pins on the SRS control unit (1).

7

Remove ESD kit.

d
8

Install

If one or more pins on the SRS
control unit (1) are damaged or
bent:
↓
Replace SRS control unit (1).
l ESD kit

Install SRS control unit (1).

000 589 52 98 00

AR91.60-D-0622TSR

f

000 589 52 98 00

ESD kit

V-SC-2020080012

3

Parts ordering note

4

V-SC-2020080012

Model

907
with code ZU8 (National version for USA)

i
The testing tools (104-pin and 20-pin) only has to be
prepared once per workshop. After completing cleaning,
store away the prepared testing tools clean and dry for
further use.
Perform visual check before each use. As soon as soiling
or damage can be detected, this testing tool must be
replaced with a new one. Dispose of old testing tool!

i
The 104-pin testing tool consists of
the coupling housing (1) (A 029 545
90 26) and the contact carriers (3) (A
005 545 53 40, A 005 545 54 40).

D91.60-A013-74

1

Remove mounting frame bow (2) from
coupling housing (1) and dispose of it.

D91.60-A017-74

2

Install both contact carriers (3) into
coupling housing (1).

i
Ensure that retaining lugs (arrows) of
contact carriers (3) engage correctly.

i
Slide both contact carriers (3) into
coupling housing (1) up to end stop with
little force.

V-SC-2020080012

5

i
The 20-pin testing tool consists of
parts of the airbag control unit
coupling housing (4) (A 166 545 04
26) and the contact carrier (5) (A 005
545 23 40).

D91.60-A014-74

3

6

Slide contact carrier (5) into coupling
housing (4) with little force until contact
carrier (5) latches into place.

4

V-SC-2020080012

Remove detent lever (6) and locking clip
(7) from coupling housing (4) and
dispose of them.

SM91.60-D-0069-03SG
Topical note

Model

Clean pins on SRS control unit
(code: VS3ZKUSRS, acc. no.:
54 904 59)
Information on preventing
damage to electronic
components due to
electrostatic discharge

AH54.00-P-0001-01A

907
with code ZU8 (National version for USA)

000 589 52 98 00

ESD kit

i
Use lESD kit throughout entire cleaning process.
The pins of the supplemental restraint system (SRS)
control unit (1) must not be touched.
Apart from the cleaning bushings (2), no other cleaning
agents or the like may be used.
1

Clean all pins in
SRS control unit (1)
with extreme care
using cleaning
bushings (2).
p
Do not tilt!
Adjacent pins could
be damaged or bent
by tilting the cleaning
bushing (2).
i
Perform all
operations on ESD
mat (3).

D91.60-A015-76

V-SC-2020080012

7

i
Ensure scrupulous cleanliness!
Slide cleaning bushings (2) onto pins in insertion direction
up to end stop and remove again.
i
The cleaning bushings (2) must be positioned parallel to
the lower edge of the SRS control unit (1)!
i
Inserting the cleaning bushings (2) offset by 90° to the
lower edge of the SRS control unit (1) can cause damage
to the pins.

i
Perform all movements on the plugs in a straight line so as
not to damage (bend) them!
i
Up to two pins can be cleaned at the same time.
i
No pins may be omitted.

•

Connector rows A and B must be cleaned completely
using a cleaning bushing (2). Repeat this process twice
with a new cleaning bushing (2) each time.

•

Connector rows C and D must be cleaned completely
using a cleaning bushing (2). Repeat this process twice
with a new cleaning bushing (2) each time.

i
This means that each pin is cleaned three times!

i
Perform cleaning in the following sequence:
The SRS control unit (1) has 4 connector rows (A to D).
A total of 6 cleaning bushings (2) are required for the
entire cleaning process.
2

D91.60-A018-80

i
The number of pins can vary.

After completing
cleaning, render
cleaning bushings
(2) unusable and
dispose of them.
i
Cleaning bushings
(2) may not be
reused.
D91.60-A016-74

8

V-SC-2020080012