NHTSA ID Number: 10183248
Manufacturer Communication Number: LI54.10-P-069698
TSB/Document Date: 2020-11-30
Summary
Functional impairment of 48 V on-board electrical system
Functional impairment of 48 V on-board electrical system
Topic number
LI54.10-P-069698
Version
5
Function group
54.10 Battery, power supply, voltage converter
Date
10-19-2020
Validity
Model series 257, 213, 238, 167, 290 with code B01
Reason for change
updating remedies
Reason for block
Complaint:
1. Instrument cluster message 48 V on-board electrical system battery (G1/3) in yellow or red
2. Vehicle does not start
3. Limp home mode due to high engine operating temperatures
Cause:
Cause 1/6: Communication error between 48 V on-board battery G1/3 and DC/DC converter: B183387 in DC/DC converter N83/1
Cause 2/6: Always create PTSS case - Limp home mode with additional symptoms: overheating, A/C blowing hot,
and loss of acceleration with fault code: B183371 The battery for 48V on-board electrical system has a malfunction.
The actuator is blocked.
Note: this fault code may include additional 48V system consequential faults although B183371 is the primary root
cause.
Cause 3/6: Red battery light or check engine light without fault B183371
Cause 4/6: Battery Not found in Quick Test.
Cause 5/6: Fault B183301 in DC/DC or B183349 in 48V battery.
Cause 6/6: B183319 in 48V battery - hardware short circuit in 48V system
Remedy:
Preliminary measures NOTE: It is imperative to document each one of these steps in detail. Some of the remedies will
require opening a PTSS case. This information is vital in helping to expedite the diagnostic process.
• Make sure Add-ons are are up to date in Xentry Machine
• Complete guided test(s) and subsequent physical layer inspection.
• Confirm all 48v components can be actuated via Xentry guided tests: A1 = M75 electrical coolant pump, A2 = M60
Electrical turbo, A3 = A9/5 electric refrigerant (A/C)
• Test 12V with Xentry Battery Tester in FSAM
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© Copyright Mercedes-Benz
AG
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• Detach line between DC/DC converter N83/1 and 48 V on-board electrical system battery. Check for: damage, soiling, corrosion,and check resistance of all cable pins (should nearly 0.2 ohms).
• Road test to attempt to duplicate fault. Test drive under as many various driving styles as possible: manual, automatic, slow, aggressive, Comfort, Sport+, etc. SAFETY is more important than testing. Please proceed with caution.
• Make sure to indicate in file names or descriptions the order the uploaded documents occurred.
• If complaint cannot be replicated and this is vehicles first visit clear all fault codes, save new quick test, field test for
20 miles with varying driving styles, and then open PTSS case.
• Upload all relevant documentation from above including:
1. Screenshots showing completed guided test(s) for Every fault code
2. Initial quick test
3. DC/DC Control Unit log
Remedy 1/6 -- if (No start)
a. If first visit pull Quick Test
i. If fault code is B183387 in DC/DC converter N83/1 - replace battery
b. If second visit open PTSS case
Remedy 2/6 -- if limp home: CEL, overheating, loss of power/acceleration, etc. - Create PTSS case with:
1. Review all 48V component wiring and connectors
2. Check and document circuit 40 from ISA to Battery for resistance
3. Confirm all 48V components can be actuated via Xentry guided tests
4. Confirm completed guided test(s) for every fault code--not just 48V
5. At the screw connections of the Phases of ISA: Use torque wrench to release the bolts to see what the release
torque is on each bolt. Document for case. Retorque to 11N-m.
6. DC/DC control unit log
8. Recent 48V Conspicuous Data from FSAM
9. If any faults in ISA control unit:
9a. Upload ISA performance data from the N129 control unit under Special Procedures, then "Procedures for
support queries to market support", "Collation of diagnosis performance data".
9b. We need both "engine at standstill" and at "engine at idle" downloaded in a .CSV format. Must be in .CSV
format.
9c. VERY IMPORTANT: take both data from BEFORE and then AFTER clearing faults in ISA.
9d. 4 total .CSV files = 2 from BEFORE DTCs are deleted (standstill / idle) AND 2 from AFTER DTCs are deleted
(standstill / idle).
10. Clear all faults and test drive for 20 miles.
11. Open PTSS case with above information
Remedy for 3/6 Battery light or CEL (without limp home mode)
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a. If faults any of these faults exist (WITHOUT B183371): B183214, B183216, or B183217
b. Check ground point W106/x or W30/11 exactly (correct torque, damage, soiling)
c. Test drive.
i. If reproducible:
1. unplug all 48 V components individually (on F153/2 disconnect the individual components of circuits 40) and
perform a test drive each time.
2. After each test drive, run a quick test to check if any of the 48 V components - except the unplugged ones are detected as faulty.
a. Try to actuate all components that are still connected.
3. If unable to actuate or detected faulty = replace component.
4. Retest.
ii. If cannot reproduce = release
Remedy for 4/6 and 5/6
a. if 48v battery not found in quick test even though wiring harness G1/3 to N83/1 has no faults
b. OR if fault B183301 in DC/DC
c. OR if fault B183349 in 48v
i. Replace battery only
ii. Update DC/DC converter N83/1 if later software is available.
Remedy for 6/6
1. Disconnect the 48V battery.
2. Remove terminal 40 (plus 48-V) to DC/DC converter N83/1.
3. Error code still present?
If yes, replace 48V on-board power battery G1/3 and settle for damage key 540HY73.
If no:
1. Short must be outside the 48 V line battery - possibly in the cables, screw connections, or components.
2. All 48V components in the series (depending on the equipment) must be disconnected one at a time. If after
disconnecting of a component the error code "B183319" in 48 V on-board power battery G1/3 is deleted or the vehicle
can be started, this component is defective and should be replaced
Symptoms
Overall vehicle / Power supply / Battery/On-board electrical system / Battery function / Battery discharges
Overall vehicle / Power supply / Battery/On-board electrical system / Battery/on-board electrical system display message / Battery/Alternator - Serviced Required
Control unit/fault code
Control unit
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© Copyright Mercedes-Benz AG
Fault code
Fault text
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N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183301
The battery for the 48V on-board electrical system has a malfunction. There is a general electrical fault. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183217
The 48V on-board electrical system has a malfunction. The limit
value for electrical voltage has been exceeded.
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183216
The 48V on-board electrical system has a malfunction. The limit
value for electrical voltage has not been attained.
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183301
The battery for the 48V on-board electrical system has a malfunction. There is a general electrical fault.
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183214
The 48V on-board electrical system has a malfunction. There is a
short circuit to ground or an open circuit. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183216
The 48V on-board electrical system has a malfunction. The limit
value for electrical voltage has not been attained. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183217
The 48V on-board electrical system has a malfunction. The limit
value for electrical voltage has been exceeded. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183371
The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183319
The battery for the 48V on-board electrical system has a malfunction. The limit value for current has been exceeded. (LIB48_222)
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183214
The 48V on-board electrical system has a malfunction. There is a
short circuit to ground or an open circuit.
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183319
The battery for the 48V on-board electrical system has a malfunction. The limit value for current has been exceeded.
N83/1 - DC/DC converter
(DDW) (DCDC48_222)
B183371
The battery for the 48V on-board electrical system has a malfunction. The actuator is blocked.
Parts
Part number
ES1 ES2 Designation
Quantity Note
A 000 982 67 14
48 V on-board electrical system battery (48 V LIB) G1/3
A 789 906 16 00
DC/DC converter (DDW) N83/
1
EPC
1
X
X
Operation numbers/damage codes
Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
RUTHERE
Damage
code
Note
540HY 73
Battery 48 V on-board electrical system - electrical fault
09803 **
Electric additional compressor - not
determinable
1500X 92
Integrated starter alternator short circuit
5416D 73
DC/DC converter 48 V on-board
electrical system
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TSB/Document ID: LI54.10-P-069698
Replacement Service Bulletin Number:
MFR Communication Date: 2020-10-19
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: ELECTRICAL SYSTEM
MFR Component System:
MFR Component Subsystem:
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