LI27.00-P-072627

Fault in 12 V interlock circuit
Topic number
LI27.00-P-072627
Version
1
Function group
27.00 - General
Date
3/16/21
Validity
MODEL 167.117/154/317/354, MODEL 205, MODEL 253, MODEL
213.011/016/050/053/054/153/155/211/216/253, MODEL 222 with engine M274/M276 and with transmission
725.017/725.037/725.047 and code ME05 (Hybrid drive
85 kW-94 kW variant (incl. plug-in))
Reason for change
Complaint
On vehicles with TRANSMISSION 725.017/725.037/725.047 and a TRANSMISSION ID between 7250**03496707
and 7250**03722656, due to loss of contact at the 12 V connector coupling of the interlock circuit it might not be possible to start the vehicle again when an ignition off/on or drive range change is performed after a safe shutdown.
A red message "Visit workshop. Do not change gear" is displayed in the instrument cluster as well as a red HV battery
message.
Fault codes relating to the interlock might be stored in the HV battery, OBL and power electronics control units.
Cause
The pins or connector of the interlock's 12 Volt connector coupling
Example pictures in the attachment.
Attachments
File
Description
PINs_en.jpg
PINs_de.jpg
Remedy
Please check the pins of the 12 Volt interlock wiring harness A 725 540 00 00 for TRANSMISSIONS
725.017/725.037/725.047 and transmission IDs between 7250**03496707 and 7250**03722656,
Please follow AR08.10-P-0028OLC if the harness requires replacement.
Please use the following damage code for the repair!
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WIS-References
Document number
Title
Note
AR08.10-P-0028OLC
Remove/install interlock line
Observe the safety notes!
Symptoms
Power transmission > Automatic transmission > Function > Malfunction
Power transmission > Automatic transmission > Function > No power flow
Power transmission > Automatic transmission > Function > Electrical fault/Fault code
Power transmission > Function > No power flow
Overall vehicle > Power supply > High-voltage on-board electrical system > High-voltage battery > Malfunction
Overall vehicle > Power supply > High-voltage on-board electrical system > High-voltage battery > Display message
Parts
Part number
ES1 ES2 Designation
Quantity Note
EPC
A7252713601
Intermediate panel
1
X
A7252723402
Sealing ring
2
X
A7253430200
Cover
1
X
A725540000064
Wiring harness
1
X
A7255450500
Housing gasket
3
X
A002989060309
Transmission oil sheet 236.17 nach Be- Specifications for Operating Fluids
darf
X
Control unit/fault code
Control unit
Fault text
N129/1 - Power electronics (SG-EM)
N129/1 - Power electronics (SG-EM)
N83/11 - Charger (SG-LG)
N83/11 - Charger (SG-LG)
N83/11 - Charger (SG-LG)
N83/11 - Charger (SG-LG)
N83/11 - Charger (SG-LG)
N83/5 - Charger (SG-LG)
N83/5 - Charger (SG-LG)
N83/5 - Charger (SG-LG)
N83/5 - Charger (SG-LG)
N82/2 - Battery management system (BMS)
N82/2 - Battery management system (BMS)
N82/2 - Battery management system (BMS)
N82/2 - Battery management system (BMS)
N129/1 - Power electronics (SG-EM)
N129/1 - Power electronics (SG-EM)
Operation numbers/damage codes
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© Copyright Mercedes-Benz AG
KATSELF
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Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
KATSELF
Damage
code
Note
5423F74
Wiring harness, hybrid drive electric
motor interlock
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