LI72.20-P-055301 Service Bulletin/Repair Instructions

Automatic liftgate occasionally fails to open

Topic number
Ll72.20-P-055301
Version
3
Design group
72.20 Rear door, tailgate
Date
09-13-2013
Validity
MODEL 166
Reason for change
Remedy: Wire color corrected (GY=>GN)
Reason for block
Complaint:

- When the liftgate is already closed, although the liftgate lock

is unlocked, the liftgate occasionally fails to open automatically.

- The opening sequence of the liftgate control is sometimes aborted.
Cause:

Implausible position sensor signal
Remedy:

Remove pins from Hall sensor for drive unit on liftgate control (HKS) on plug connector 2 of control unit for liftgate

control,

as follows:

1. Remove liftgate control (HKS) control unit as per WIS documentation (see WIS references).

=> In model series X166 the trunk covering must not be removed!

2. Detach plug connector 2 (blue connector) from liftgate control (HKS) control unit (Figure 1).

3. Remove pins 1 (GN), 2 (YE) and 5 (BN) on plug connector 2 (Figure 2).

4. Insulate individual pins using insulation tape (Figure 3).

5. Strap down removed lines on wiring harness (Figure 4).

6. Connect plug connector 2 (blue plug connector) to liftgate control (HKS) control unit (Figure 5).

7. Install liftgate control (HKS) control unit as per WIS documentation (see WIS references).
09-13-2013 4:22 PM

©Copyright Daimler AG
BRABENS
Page 1/6
If the liftgate control (HKS) fails to function after removing the pins, then an additional

initial startup and erasure of the fault memory for the liftgate control (HKS) control unit are necessary!
Attachments

File
Designation
Bild 1.JPG
Figure 1
Bild 2.JPG
Figure 2
Bild 3.JPG
Figure 3
Bild 4.JPG
Figure4
Bild 5.JPG
Figure 5
Symptoms

Body I Door/Flap I Hood/flap I Trunk lid/liftgate I Does not open

Body I Door/Flap I Hood/flap I Trunk lid/liftgate I Does not close
Control unit/fault code

Control unit
Fault code
Faulttext
HKS - Tailgate control (N121/

1) (PTCM166)
B188229
Position sensor 'Trunk lid/tailgate' has a malfunction. There is an

invalid signal.
Work units

Dp. no.
Operation text
80-2925
80-2925
Damage

code
Note
REPLACE CONTROL UNIT FOR

AUTOMATIC REAR DOOR (AFTER

CHECK)
8210B 73
W166
REPLACE CONTROL UNIT FOR

AUTOMATIC REAR DOOR (AFTER

CHECK)
8210B 73
X164
Time
WIS-References

Document number
Title
AR72.20-P-7551GQ
Remove/install rear-end

door closing control unit
Note
Allocation

Remedy
Validity

Vehicle
Engine
Transmission
166.003
•
•
166.004
•
•
166.023
•
•
166.024
•

•
•
166.055

09-13-2013 4:22 PM

©Copyright Daimler AG
•
BRABENS
Page 216
.

}{ENTRY

•

•
166.057
•
166.058
•
166.073

166.074
•

•
•
Vehicle
Engine
Transmiss ion
166.003

166.004

166.023

166.023

166.024

166.024
651.960

651.960

642.826

642.826

642.826

642.826
722.903

725.031
166.055
276.955
722.90 6
166.057

166.058

166.073
276.955

276.955
____,

722.90 6

------I

722.90 6
278.928

278.928
722.909

725.031
278.928

157.982
725.032
•
Full model designation breakdown
166.073

166.073

166.074

166.074
157.982
.
________,

________,
722.908

722.908

722.903

725.031
____
-------1
722.905

722.931
IAttachments
09-13-2013 4:22 PM

© Copyright Daimler AG
BRABENS

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Bild 1.JPG:
Bild 2.JPG:
09-13-2013 4:22 PM

©Copyright Daimler AG
BRABENS

Page 4/6
Bild 3.JPG:
Bild4.JPG:
09-13-2013 4:22 PM

©Copyright Daimler AG
BRABENS

Page 5/6
HE NT RY

Bild 5.JPG:
09-13-2013 4:22 PM

©Copyright Daimler AG
BRABENS

Page 616

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