Vehicle cannot be unlocked/ vehicle
does not start - starter battery discharged
Topic number

LI54.10-P-060374

Version

9

Design group

54.10 Battery, voltage supply, voltage converter

Date

05-23-2016

Validity

BR205
BR217
BR222
BR253

Reason for change

Analysis expanded

Reason for block

Complaint:

- Vehicle cannot be unlocked/ vehicle does not start
- Display message in instrument cluster "Battery - Start Engine - See Owner's Manual" - only vehicles as of modification year 2014 (as of SA code 805)

Attachments
File

Description

Beispiel_Buswachhalter.pdf

Example for reading bus keepawake event from electrical
system data

Beispiel Kl. 15 EIN_de.pdf

Example for terminal 15 ON

example terminal 15 active.pdf

Example for terminal 15 ON

example_BUS_keep_awake.pdf

Example for bus keepawake event

Cause:

1. Only affects model series 205/222 with SA code 550 - Trailer hitch:
Software of AHE (trailer recognition) control unit produces bus keepawake event and thus causes discharge of the
starter battery
2. Only affects model series 217/222 with SA code M005 - 4MATIC
Software of electric steering (N68) produces bus keepawake event and thus causes discharge of the starter battery
3. Affects model series 205/217/222 with SA code 889 - Keyless-Go or SA code 893 - Keyless Start
4. Affects model series 205 with SA code 520 or 522 Head Unit NTG5
Software of Audio 20 radio produces bus keepawake event and thus causes discharge of the starter battery
5. Affects model series 222 with SA code ME05 (PlugIn Hybrid)
Fault in infrastructure produces permanent bus keepawake event in on-board charger control unit
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6. Affects model series S205 and X253 up to code 807
Unrecognized status of backrest lock in 2nd seat row produces bus keepawake event

Remedy:

1. Only affects model series 205/222 with SA code 550 - Trailer hitch:
- Ask the customer whether he used the trailer hitch (SA code 550) immediately before the problem occurred.
- If "yes", work through the service measure "$1406P31B16 10 Update software of trailer recognition (AHE) control
unit" for the vehicle in question. Only affects control units (AHE) with software release A2059025802! Control units
with software release A2059026904 are therefore not affected! In addition, charge the starter battery as described in
WIS and check it before handing the vehicle back over to the customer.
2. Only affects model series 217/222 with SA code M005 - 4MATIC
Use Xentry Diagnostics to access the electrical system diagnosis for the driver-side SAM (N10/6)
Driver-side SAM (N10/6) --> Actual values --> Electrical system data
To be able to assess whether a bus keepawake event caused the battery discharge, it is necessary to examine the
stationary cycles. A constantly active CAN is identified by the text "Interior CAN awake unusually long" (see attachment). If this text is not displayed, the battery discharge has a different cause.
If it is confirmed that the battery was discharged by a bus keepawake event, the electric steering control unit (N68)
must be flashed to the current version (14/29 00). To invoice the overall claim, use the damage code 46494 90 "Electric rack-and-pinion steering control unit".
3. Affects model series 205/217/222 with SA code 889 - Keyless-Go or SA code 893 - Keyless Start
Note: This customer complaint does not indicate a technical fault in the vehicle. The customer unintentionally left the
vehicle with terminal 15 "on". This occurs when the Keyless-Go or Keyless Start button on the EZS is pressed again
after opening the driver door (once = terminal 15R active; twice = terminal 15 active). If the customer parks the vehicle
in this condition, it is not possible to lock it from outside and the vehicle is found unlocked at the breakdown location.
Any diagnostic work cannot be invoiced via Warranty.
Use Xentry Diagnostics to access the electrical system diagnosis
for the driver-side SAM (N10/6). Driver-side SAM (N10/6) --> Actual values --> Electrical system data
To be able to assess whether the battery was discharged by switching on terminal 15, it is necessary to examine the
stationary cycles. A constantly switched-on terminal 15 is identified by the text "Ignition ON for long time" (see attachment). If this text is not displayed, the battery discharge has a different cause.
In vehicles of model series 205, 217 and 222 as of production date 06/2015, the function of automated circuit switching was introduced. If the customer parks his vehicle with circuit 15 active, this is automatically switched back to circuit 15R after 15 minutes. After another 30 minutes, circuit 15R is automatically switched off. This functionality will actively assist in reducing breakdown cases.
4. Affects model series 205 with SA code 520 or 522 Head Unit NTG5
Use Xentry Diagnostics to access the electrical system diagnosis for the driver-side SAM (N10/6)
Driver-side SAM (N10/6) --> Actual values --> Electrical system data
To be able to assess whether a circuit 30g bus keepawake event caused the battery discharge, it is necessary to examine the stationary cycles. A constantly active CAN is identified by the text "Interior CAN awake unusually long" (see
attachment). If this text is not displayed, the battery discharge has a different cause.
If it is confirmed that the battery was discharged by a circuit 30g bus keepawake event, the Audio 20 control unit
(A26/17) must be flashed to the current version (14/26 00 - E16.3 or higher). The necessary software release is
available as of Xentry version 09/2014. To invoice the overall claim, use the damage code 87100 54 "Head Unit control unit".
5. Affects model series 222 with SA code ME05 (PlugIn Hybrid)
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Use Xentry Diagnostics to access the electrical system diagnosis
for the driver-side SAM (N10/6). Driver-side SAM (N10/6) --> Actual values --> Electrical system data
To be able to assess whether a bus keepawake event caused the battery discharge, it is necessary to examine the
stationary cycles. A constantly active CAN is identified by the text "Interior CAN awake unusually long" (see attachment). If this text is not displayed, the battery discharge has a different cause. Only affects LG charger control units
(N83/5) with software release A0009054922! Control units with software release A0009026827 are therefore not affected! In addition, charge the 12 V starter battery as described in WIS and check it before handing the vehicle back
over to the customer.
If it is confirmed that the battery was discharged by a bus keepawake event, the LG charger control unit (N83/5) must
be flashed to the current version (A0009026827).
To invoice the overall claim, use the damage code 5420 W 90 "High-voltage battery charger control unit".
Note: The customer should always be advised that there is a fault in the infrastructure for charging the high-voltage
battery! The infrastructure must also be tested so as to guarantee correct charging of the high-voltage battery and the
associated functions.
6. Rear SAM (N10/8) flash software: New software 15/ 15/ 00
Unrecognized status of backrest lock in 2nd seat row produces bus keepawake event
Invoice with damage code 54590 90 "Rear SAM control unit - Software release".
Further information!!
Please continue to report vehicles with complaints concerning the battery or the on-board electrical system, on which
the measures described above are ineffective, before commencing repair work if possible, via the TIPS Case Module
with the information listed below, to the relevant Technical Market Support department (Note for German market: Address the TIPS case to the Telematics Team only!!):
Note on bus keepawake detection:
In model series 205/217/222 with SA code 804 or 805, the bus keepawake detection function in the EZS control unit
(N73) is not available until further notice. The electrical system diagnosis in the driver-side SAM (N10/6) must be used
to validate bus keepawake events. There you should find the text "Interior CAN active unusually long" in the relevant
"stationary cycle". If this text does not appear, the cause of the discharge of the starter battery is not a bus keepawake
event.
--> A software update of the EZS control unit (N73) is available in the Bus keepawake unit recording menu in the EZS
control unit (N73). The bus keepawake detection function will be available in vehicles as of production date 06/2015.
When a bus keepawake event is detected, it is identified by the fault memory entry "U116000 - A bus keepawake
event was detected".
The two memory entries for the bus keepawake detection function are displayed as usual under "Actual values" when
the EZS control unit (N73) is accessed! In vehicles prior to production date 06/2015, no indication is given, as previously.
1. Detailed customer complaint
2. Control unit log of driver SAM (N10-6)

Only the original PDF file (not scanned documents)

3. Midtronics battery test results - AR54.10-P-1129LW
4. Battery part number and terminal stamp 5. Results of no-load current measurement When the CAN is active, the
no-load current consumption is approx. 4.5 - 8.5 A. In this case, immediately connect a battery charger to the jumpstart connection point. This will prevent a circuit 30 reset until the cause can be clarified. Then a scan of the interior
CAN (body CAN) must be generated with SD-Scan. The file in "asc" format must be attached to the corresponding
PTSS case for processing.
5. For vehicles as of production date 06/2015 (SA code 806), both memory entries from the bus keepawake detection
function in the EZS are required.
Note: Do not use items 3 and 4 for BR205 vehicles with code "U98" - Lithium-ion starter battery or for BR217/222
AMG model designations!
- Was the trailer hitch used before the problem was discovered (only vehicles with SA code 550 Trailer recognition)?
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- Did the customer find the vehicle locked or unlocked at the breakdown location (vehicles with SA code 889 Keyless-Go or SA code 893 "Keyless Start")?
- Is the problem vehicle a demonstration vehicle?

Symptoms
Overall vehicle / Power supply / Battery/On-board electrical system / Battery function / Battery discharges
Overall vehicle / Power supply / Battery/On-board electrical system / Battery function / Battery cannot be charged
Overall vehicle / Power supply / Battery/On-board electrical system / Battery/on-board electrical system display message / Low voltage Charge battery
Overall vehicle / Power supply / Battery/On-board electrical system / Battery/on-board electrical system display message / Charging

Control unit/fault code
Control unit

Fault code

Fault text

N10/6 - Front signal acquisition B1F4500
and actuation module (Driverside SAM) (BC_F222) (S (222)
,S (217),C (205))

The starter battery has excessive resistance. _

N73 - Electronic ignition lock
(EZS) (EIS222) (S (222),S
(217),C (205))

A bus keepawake unit was detected. _

U116000

Parts
Part number

ES1 ES2 Designation

Quantity Note

EPC

A 000 982 86 08

60 Ah starter battery

1

Not code "U98"

X

A 004 541 86 01

70 Ah starter battery

1

Not code "U98"

X

A 000 982 21 08

80 Ah starter battery

1

Not code "U98"

X

A 001 982 68 08

78 Ah lithium-ion starter batte- 1
ry

Model series 205 with SA code
"U98";
model series 217/222 - only AMG
model designations and SA code
M157 or M279

X

A 005 541 10 01

95 Ah starter battery

1

Not code "U98"

X

A 000 982 18 08

105 Ah starter battery

1

Not code "U98"

X

Operation numbers/damage codes
Op. no.

Operation text

54-1011

PERFORM QUICK TEST

Use the damage code for the component causing the damage!

54-0640

CHECK BATTERY SYSTEM (AFTER
QUICK TEST)

Use the damage code for the component causing the damage!

54-1109

CHECK CONDITION OF BATTERY

Not code "U98", not AMG model designations

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Time

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Damage
code

Note

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Use the damage code for the component causing the damage!
54-1126

REPLACE BATTERY (AFTER CHECK)

Use the damage code for the component causing the damage!

54-0650

MAINTAIN ON-BOARD ELECTRICAL
SYSTEM VOLTAGE (FOR TESTING
AND DIAGNOSIS WORK)

Use the damage code for the component causing the damage!

54-0991

PROGRAM CONTROL UNIT ...............
(AFTER QUICK TEST)

Use the damage code for the component causing the damage!

54-0992

CODE CONTROL UNIT............. (AFTER QUICK TEST)

Use the damage code for the component causing the damage!

54-0645

CHECK NO-LOAD CURRENT CONSUMPTION

Use the damage code for the component causing the damage!

WIS-References
Document number

Title

Note

Allocation

AR54.10-P-1129LW

Battery - Check condition

Not BR205 with code "U98" Cause
Lithium-ion starter battery
or BR222 AMG model designations

AR54.10-P-1130LW

Charge battery

Remedy

Validity
Vehicle

Engine

Transmission

C (205) - 205.002

*

*

C (205) - 205.003

*