LI54.10-P-071832

Vehicle cannot be unlocked/ vehicle
does not start - starter battery discharged
Topic number
LI54.10-P-071832
Version
3
Function group
54.10 - Battery, power supply, voltage converter
Date
7/20/22
Validity
Model series 177, model series 118, model series 247
Reason for change
updating remedy
Complaint
- Vehicle cannot be unlocked/ vehicle does not start
- Display message in instrument cluster "Battery - Start Engine - see Operator's Manual"
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
Root cause is a bus keepawake in either the Headlight control unit or in one of the following: ALC, IC, SAM, PTCU,
ESP.
Additionally, the quick test will show U116000 "A bus keepawake control unit has been detected" in the
electronic ignition switch (EZS) control unit for this root cause.
WIS-References
Document number
Title
Note
AR54.10-P-1129LW
Battery - Check condition
Remedy
Eliminate bus keep awake issue flash new software where available:
ESP N30/4
AML (Ambiance Light control unit N162)
HLM (Headlight module E1n9 and E2n9)
20.07.2022 15:44:22
© Copyright Mercedes-Benz AG
RUTHERE
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FSAM
Instrument Cluster
PTCU
Clear all faults, road test, leave vehicle for 24hrs. Review new quick test. If fault U116000 has returned, create a
PTSS case with the following documentation:
Control unit event log of electronic ignition lock, EZS (N73)
- Control unit event log of SAM-F (N10/6)
- Up-to-date no-load current measurement
Document the following questions with the customer:
- Were there any messages in the instrument cluster?
- Did this behavior occur once only, or has it occurred before?
--If so, when (approximately)?
- Was the vehicle parked in a particular location or with high traffic levels?
- Has the vehicle been modified or are there any installations in the vehicle?
WIS-References
Document number
Title
Note
AR54.10-P-1130LW
Charge battery
AR54.21-P-0038ME
Remove/install electronic ignition lock
control unit
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
Operation numbers/damage codes
Op. no.
Operation text
541011
PERFORM QUICK TEST
Use the damage code for the component causing the damage!
540640
CHECK BATTERY SYSTEM (AFTER
QUICK TEST)
Use the damage code for the component causing the damage!
541109
CHECK CONDITION OF BATTERY
Use the damage code for the component causing the damage!
541126
REPLACE BATTERY (AFTER CHECK)
Use the damage code for the component causing the damage!
20.07.2022 15:44:22
© Copyright Mercedes-Benz AG
Time
RUTHERE
Damage
code
Note
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540650
MAINTAIN ON-BOARD ELECTRICAL
SYSTEM VOLTAGE (FOR TESTING
AND DIAGNOSIS WORK)
Use the damage code for the component causing the damage!
540991
PROGRAM CONTROL UNIT ...............
(AFTER QUICK TEST)
Use the damage code for the component causing the damage!
540992
CODE CONTROL UNIT............. (AFTER QUICK TEST)
Use the damage code for the component causing the damage!
540645
CHECK NO-LOAD CURRENT
CONSUMPTION
Use the damage code for the component causing the damage!
542536
REPLACE ELECTRONIC IGNITION
LOCK CONTROL UNIT (AFTER QUICK
TEST)
Use the damage code for the component causing the damage!
20.07.2022 15:44:22
© Copyright Mercedes-Benz AG
RUTHERE
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