Head unit display fails shortly after engine start - Fault co-
de (C200200) for overvoltage stored in ESP control unit

Topic number L154.10-P-062091

Version 1

Design group 54.10 Battery, voltage supply, voltage converter

Date 08-21-2015

Validity Model 172; 204; 207; 212; 218; 231 with SA code "B03"

ECO start/stop and without SA code "4U7" Voltage dip li-
miter for ECO start/stop system

Reason for change

Reason for block

Complaint:
The head unit (HU) display fails shortly after the vehicle starts to move when the speed first exceeds 20km/h.

In addition, the following fault messages about driver assistance systems may be displayed in the instrument cluster:

- Release Parking Brake
- ESP - Service Required

See attachment for possible fault codes.

Cause:
1. Electrical fault in backup battery coupling relay "K114"

2. Electrical fault in ECO start/stop function backup battery

Remedy:
4. Check ECO start/stop function backup battery coupling relay (K1 14) via actuation:

Use Xentry Diagnostics to access the driver-side SAM control unit (N10/1) --> Tests --> Check ECO start/stop functi-
on backup battery coupling relay (K114):

- The test result is displayed in the overview for the test. The voltage present at the backup battery is saved and dis-
played every 0.5 seconds.
- Possible faults:

- Backup battery coupling relay fails to close --> The voltage of the backup battery does not converge with the
on-board electrical system voltage

- Coupling relay closes, but opens again after approx. 2 seconds due to an internal fault --> The voltage of the
backup battery briefly rises to match that of the starter battery and then drops back to its original level during the ac-
tuation.

In the event of faults, the ECO start/stop function coupling relay must be replaced.

- If the voltage of the backup battery converges with the voltage of the starter battery, there is no fault and no compo-
nents should be replaced.

If this is the case, the test of the backup battery must be performed.
2. Check ECO start/stop backup battery:

08-21-2015 3:58 PM PLUBONS
© Copyright Daimler AG Page 1/18

- Check backup battery using Midtronics tester and replace if necessary

Note: If the results of the test are not clear and the previously performed relay test was successful, a test of the
backup battery must be performed using a load resistance.

Attachments

File

Description

Beispiel Diagnose Koppelrelais K114_de_i_O.pdf

Test of backup battery coupling relay (K114) OK

Beispiel Diagnose Koppelrelais K114_de_n_i_O.pdf

Test of backup battery coupling relay (K114) not OK

example check coupling relay K114_en_ok.pdf

Test of backup battery coupling relay (K114) OK

example check coupling relay K114_en_defective.pdf

Test of backup battery coupling relay (K114) not OK

E-15-54-02.3 01-00.1_K_Generator_Belastungstester.pdf | Workshop equipment

Symptoms

Overall vehicle / Power supply / Alternator / Alternator function / Overvoltage

Communication/information / Entertainment / Screen/display / Display dark -System running

nal

Communication/information / Information display / Displays / Multifunction display / Multifunction display / Nonfunctio-

Control unit/fault code

LR) (DMRL_212) (GLK (204),
CLS (218),E (212),C (204))

Control unit Fault code Fault text

N30/4 - Electronic stability pro- |C200200 The supply voltage of control unit 'N30/4 (Electronic Stability Pro-
gram (ESP®) (ABR2XT) (GLK gram control unit)' is too high (overvoltage).

(204),SLK/SLC 172,C (204))

N69/2 - Right front door (DCU- |B210B00 The power supply in the system is too high. _

RF) (DMFR166) (SL (231))

N69/2 - Right front door (DCU- |B210C17 The power supply is outside the valid range. The limit value for
RF) (DMFR166) (SL (231)) electrical voltage has been exceeded.

N69/2 - Right front door (DCU- |A10B00 The power supply in the system is too high. _

RF) (DMFR_212) (GLK (204)

{CLS (218), E (212),SLK/SLC

172,E (207),C (204))

N69/2 - Right front door (DCU- |A10C17 The power supply is outside the valid range. The limit value for
RF) (DMFR_204) (GLK (204), electrical voltage has been exceeded.

C (204))

N30/4 - Electronic stability pro- |}643F00 The supply voltage of control unit 'N30/4 (Electronic Stability Pro-
gram (ESP®) (ESP212) (GLK gram control unit)' is too high (overvoltage).

(204),CLS (218),E (212),E

(207),C (204))

N30/4 - Electronic stability pro- |C011200 Control unit 'N30/4 (Electronic Stability Program control unit)’ has
gram (ESP®) (ESP9MFA) (SL detected an overvoltage.

(231))

N69/3 - Left rear door (DCU- |A10C17 The power supply is outside the valid range. The limit value for
LR) (DMRL_212) (GLK (204), electrical voltage has been exceeded.

CLS (218),E (212),C (204))

N69/3 - Left rear door (DCU- |A10B00 The power supply in the system is too high. _

08-21-2015 3:58 PM
© Copyright Daimler AG

PLUBONS
Page 2/18

N69/4 - Right rear door (DCU- |A10C17 The power supply is outside the valid range. The limit value for
RR) (DMRR_212) (GLK (204), electrical voltage has been exceeded.
CLS (218), E (212),C (204))
N69/4 - Right rear door (DCU- |A10B00 The power supply in the system is too high. _
RR) (DMRR_212) (GLK (204),
CLS (218),E (212),C (204))
N69/1 - Left front door (DCU- |B210B00 The power supply in the system is too high. _
LF) (DMFL166) (SL (231))
N69/1 - Left front door (DCU- |B210C17 The power supply is outside the valid range. The limit value for
LF) (DMFL166) (SL (231)) electrical voltage has been exceeded.
Parts
Part number ES1|ES2 |Designation Quantity |Note EPC
A 000 982 20 23 Backup battery coupling relay |1 x
"K114"
A211 54100 01 Aux Battery 1 Test using Midtronics Xx
Operation numbers/damage codes
Op. no. Operation text Time Damage Note
code
54-1011 PERFORM QUICK TEST 53233 73
54-0640 CHECK BATTERY SYSTEM (AFTER 53233 73
QUICK TEST)
54-1139 REPLACE RELAY FOR ECO START/ 53233 73 |If necessary
STOP FUNCTION ADDITIONAL BAT-
TERY (AFTER CHECk)
54-1136 CHECK CONDITION OF ECO START/ 54027 73 __‘|If necessary
STOP FUNCTION ADDITIONAL BAT-
TERY, TERMINAL STAMP:... BATT.
PART NO.:... TEST CODE....
54-1137 REPLACE ADDITIONAL BATTERY 54027 73 =| If necessary
FOR ECO START/STOP FUNCTION
AFTER CHECK
WIS-References
Document number Title Note Allocation
AR54.10-P-1127CW Maintain on-board electrical Remedy
system voltage for testing
and diagnosis work on the
vehicle
$154.10-P-0017A Battery testing and inspecti- Remedy
on
Validity
08-21-2015 3:58 PM PLUBONS
© Copyright Daimler AG Page 3/18

Vehicle Engine Transmission
C (204) * *
CLS (218) *
E (207) * *
E (212) * *
GLK (204) * *
SL (231) * :
SLK/SLC 172 * i
Full model designation breakdown
Vehicle Engine Transmission
172.403 651.980 711.670
172.403 651.980 722.908
172.403 651.980 725.011
172.404 651.980 711.670
172.404 651.980 722.908
172.404 651.980 725.011
172.434 274.920 716.702
172.434 274.920 122.995
172.434 274.920 725.011
172.438 274.920 725.011
172.447 271.861 711.653
172.447 271.861 711.654
172.447 271.861 722.997
172.448 271.861 711.655
172.448 271.861 722.997
172.457 276.956 722.906
172.475 152.172 722.909
172.475 152.980 722.909
204.000 651.913 711.653
204.000 651.913 716.656
204.000 651.913 722.694
204.000 651.913 722.996
204.001 651.913 711.653
204.001 651.913 716.656
204.001 651.913 722.694
204.001 651.913 722.996
204.002 651.911 711.653
204.002 651.911 716.656
204.002 651.911 722.646
204.002 651.911 722.908
204.003 651.911 711.670
08-21-2015 3:58 PM PLUBONS