Parking brake warning message in instrument cluster - Moisture ingress in Electronic Stability Program (ESP) connection
Topic number

LI42.20-P-063685

Version

2

Design group

42.20 Parking brake

Date

06-08-2016

Validity

Model 205 LHD/RHD with code 805.
Model 205 LHD with code 806.
Model 253 LHD/RHD with code 806.

Reason for change

Part number A 002 545 01 41 is incorrect.
A 002 546 01 41

Reason for block

Complaint:

- Parking brake warning message in instrument cluster.
- Parking brake cannot be released.
If there is any moisture in the immediate vicinity before the connector is opened, this must be removed, e.g. using a
heat gun, air gun or a dry rag. Otherwise erroneous conclusions may be drawn in the subsequent assessment of the
complaint.
Workshop findings (area around connector dry):
Corrosion/moisture ingress in the connection (pins, female contacts) to the "Electronic Stability Program (ESP)" control unit.
Please always create a PTSS case with title "ESP Connector - Moisture Entry" and record any corrosion, verdigris and/or moisture ingress with photos, at the pins on the ESP control unit and at the female contacts in the ESP
connector, and follow the instructions in this LI document.

Cause:

Water/moisture in connector for the "Electronic Stability Program (ESP)" control unit.

Attachments
File

Description

Wasserableiter - Water baffle.pdf

Water baffle

Remedy:

1st option - Repair of the wiring harness
Requirements:
- No more than 10 female contacts in the connector are corroded or damp.
- The copper strands of the electrical lines are not corroded or damp after the firewall grommet (distance from connector to firewall grommet approx. 220mm).
The up to 10 (affected) female contacts must be removed from the connector using the release tool.
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Then work your way along the line with a wire stripper until bare and uncorroded copper is visible (exception: female
contacts 1, 14 and 30 [for M177 (AMG) see note]).
Never strip the female contacts 1, 14 and 30 [for M177 (AMG) see note] because these are lines with a cross section
of 6mm² (not repairable).
If the requirements are met, repairs can be performed at the ESP connector as necessary using the following components:
- Line (sold by the meter)
- Female contacts
- Single-wire seals
- Terminal solder connectors
Pay attention to the additional operation at F32/3 - C3!
2nd option - Replacement of the frame floor system (FFS) main wiring harness
- If the requirements for the 1st option are not satisfied, the frame floor system harness must be replaced.
Pay attention to the additional operation at F32/3 - C3 to help avoid a reoccurrence of the complaint!
Hydraulic unit (N30/4)
If the pins at the ESP control unit are corroded, the hydraulic unit must be replaced. If the pins (up to 10) are merely
damp, they can be dried using a heat gun.
Additional operation at F32/3 - C3:
- If the 1st option is used or
- If the new frame floor system main wiring harness of the 2nd option with single-wire seals at connector C3 (F32/3) is
supplied,
the following work must be performed (see photos in attachment "F32.3 - C3"):
1. Production configuration: Connector C3 closed.
2. Open connector C3 by pressing the primary catch down.
3. Open the secondary catch of connector C3 (1st position "closed", 2nd position "open") by pressing the catch towards the outside of the housing using a screwdriver.
4. Use blade W 220 589 01 99 56 and blade holder W 220 589 01 99 50 to remove one female contact from the housing.
5. Take the female contact(s) out of the housing.
6. Pull back the single-wire seal(s). (This will allow water to drain out out of the bottom of the connector.)
7. Use side cutting pliers to remove (snip off) the insulation crimp.
8. Remove the insulation crimp (stretch and remove) with pliers carefully so as not to damage the line.
9. Cut the heat-shrinkable tubing A 004 546 84 30 in the middle (supplied in lengths of 65mm) because heat-shrinkable tubing is required for both lines (32.5mm per line).
10. Pull the heat-shrinkable tubing over the female contact. Position the heat-shrinkable tube 1.5 to 2mm below the
edge of the female contact (pull the single-wire seal further down if necessary; the single-wire seal must not touch the
heat-shrinkable tubing).
11. Use a heat gun to heat the heat-shrinkable tubing until it lies evenly and snugly over the repair point (see also
AR00.19-P-0100-08A).
12. The adhesive must protrude at both ends.
13. Put the female contact back in the housing. Important: The single-wire seal should no longer be in contact with the
housing; the heat-shrinkable tubing prevents this.
14. Repeat all the steps from 4 to 13 for the second female contact. Then close the secondary catch.
15. Final state (single-wire seals not in contact with housing).
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Note on ESP connector in M177 (AMG):
In the M177 (AMG) this is a 38-pin connector to which no lines with a cross section of 6mm² are connected.
The only difference is pin 1 and the ground point pin, both MCP6.3 - 4mm² female contacts.

Attachments
File

Description

F32.3 - C3.pdf

F32.2 - C3

Symptoms
Chassis/suspension / Brake system / Parking brake / Indicator lamp / Parking brake / lit
Chassis/suspension / Brake system / Parking brake / Function / General
Chassis/suspension / Brake system / Parking brake / Function / Does not open/trigger
Chassis/suspension / Brake system / Parking brake / Indicator lamp / Parking brake / Illuminates red
Chassis/suspension / Brake system / Parking brake / Indicator lamp / Parking brake / Illuminates yellow
Chassis/suspension / Brake system / Parking brake / Display message / Parking brake - apply brake
Chassis/suspension / Brake system / Parking brake / Display message / Parking brake - release brake
Chassis/suspension / Brake system / Parking brake / Display message / Parking brake - Parking brake see Owner's
Man.
Chassis/suspension / Brake system / Parking brake / Display message / Parking brake - Parking brake inoperative
Visit workshop
Chassis/suspension / Brake system / Brakes/traction regulation system / Antilock Brake System ABS / Display message / Antilock braking system - visit workshop
Chassis/suspension / Brake system / Brakes/traction regulation system / Electronic Stability Program ESP / Display
message / Display text, yellow/white / Electronic stability program - visit workshop
Chassis/suspension / Brake system / Brakes/traction regulation system / Electronic Stability Program ESP / Indicator
lamp / lit

Control unit/fault code
Control unit

Fault code

Fault text

N30/4 - Electronic stability pro- B23AC64
gram (ESP®) (ESP205) (C
(205))

The switch 'Electric parking brake' has a malfunction. There is an
implausible signal.

N30/4 - Electronic stability pro- C100B77
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. The commanded
position cannot be reached.

N30/4 - Electronic stability pro- B23AA72
gram (ESP®) (ESP205) (C
(205))

The left brake caliper has a malfunction. The actuator does not
close.

N30/4 - Electronic stability pro- B23AA73
gram (ESP®) (ESP205) (C
(205))

The left brake caliper has a malfunction. The actuator does not
open.

N30/4 - Electronic stability pro- B23AB72
gram (ESP®) (ESP205) (C
(205))

The right brake caliper has a malfunction. The actuator does not
close.

N30/4 - Electronic stability pro- B23AB73
gram (ESP®) (ESP205) (C
(205))

The right brake caliper has a malfunction. The actuator does not
open.

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N30/4 - Electronic stability pro- B23AC49
gram (ESP®) (ESP205) (C
(205))

The switch 'Electric parking brake' has a malfunction. There is an
internal electrical fault.

N30/4 - Electronic stability pro- B23AC2F
gram (ESP®) (ESP205) (C
(205))

The switch 'Electric parking brake' has a malfunction. There is an
erratic signal.

N30/4 - Electronic stability pro- B23AC2A
gram (ESP®) (ESP205) (C
(205))

The switch 'Electric parking brake' has a malfunction. There is no
signal change.

N30/4 - Electronic stability pro- C100BFA
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. _

N30/4 - Electronic stability pro- C100BFC
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. _

N30/4 - Electronic stability pro- C100BFD
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. _

N30/4 - Electronic stability pro- C100BFE
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. _

N30/4 - Electronic stability pro- C100BFF
gram (ESP®) (ESP205) (C
(205))

The electric parking brake has a malfunction. _

Parts
Part number

ES1 ES2 Designation

Quantity Note

EPC

Frame floor system main wiring harness

1

The relevant part number must be
found in the EPC: Category 54, Subcategory 545, Item 10.

Hydraulic unit

1

The relevant part number must be
found in the EPC: Category 42, Subcategory 064, Item 10.

W22058901995 6

Blade

1

Release tool F32/3 - C3.
Also for M177 (AMG) ESP connector
for pin 1 and ground point.

A 004 546 84 30

Heat-shrinkable tubing with
pressure-melt element

1

Single-wire seal removed/ fitting of
heat-shrinkable tubing

X

W22058901995 0

Blade holder for release tool

1

A 169 543 02 31

Line 0.5mm²

Also suitable for the 0.35mm² female
contacts.
Sold by the meter (yellow): 100m roll

X

A 169 543 06 31

Line 2.5mm²

Sold by the meter (yellow): 50m roll

X

A 021 545 17 26

Female contact 0.35mm²
MCP1.2 LL

10

Also suitable for the 0.5mm² female
contacts.
Max. quantity 10.
Female contact with catch spring.

X

A 014 545 82 26

Female contact 2.5mm²
MCP2.8

4

Max. quantity 4.
Female contact with catch spring.

X

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A 000 545 68 80

Single-wire seal 0.35mm²

10

Also suitable for the 0.5mm² female
contacts.
Max. quantity 10.

X

A 000 545 29 39

Single-wire seal 2.5mm²

4

Max. quantity 4.

X

A 001 546 99 41

Terminal solder connector 0.
35mm²

10

Raychem cable connector with hotmelt adhesive, immersion-proof.

X

A 002 546 01 41

Terminal solder connector 2.
5mm²

4

Raychem cable connector with hotmelt adhesive, immersion-proof.
Max. quantity 4.

X

W00058913993 0

Blade MCP2.8

1

Release tool

W22058904993 0

Blade MCP1.2

1

Release tool

W22058904991 0

Crimping set MCP1.2 ELA

1

In combination with hand crimper
W220589019910.

W22058901998 1

Crimping set MCP2.8 ELA

1

In combination with hand crimper
W220589019910.

A 000 982 72 26

Female contact 4mm² MCP6.3 2

M177 (AMG) only.
ESP connector pin 1 and ground
point.

X

A 002 545 34 80

Single-wire seal

2

M177 (AMG) only.
ESP connector pin 1 and ground
point.

X

W93058900990 7

Crimping set MCP6.3 - 4mm²

1

M177 (AMG) only.
ESP connector pin 1 and ground
point.

Operation numbers/damage codes
Op. no.

Operation text

Time

Damage
code

Note

51081 74

K/Z*, engine compartment prefuse
box

WIS-References
Document number

Title

Note

AR00.19-P-0100-08A

Protect repair point after line Protection of repair point
repair
with heat-shrinkable tubing

Allocation
Remedy

Validity
Vehicle

Engine

Transmission

C (205)

*

*

GLC (253)

*

*

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