NHTSA ID Number: 11012806
Manufacturer Communication Number: LI46.10-P-078012
TSB/Document Date: 2025-01-10
Summary
Complaint Hand detection system not operating correctly / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" Cause Possible causes: the hand detection mat, the hand detection control unit, the contacts and the steering wheel harness. Remedy Test Procedure: Perform an initial quick test with freeze frame data. Save the N179 - Hand detection system (HE) and N62/4 - Driver assistance system (SG-FAS) control unit logs. Note the fault frequency of fault codes set. Delete the N179 and N62/4 fault memory. Using both hands, "scan" the steering wheel all the way round, including the chrome molding at 6 o'clock (see Picture 1). Read out fault memory and follow steps below for any faults set. Remedy: Vehicles with control unit N179 - Hand detection system (HE): B1E7614: Check contacts and wiring harness in steering wheel by carrying out a visual check for damage, pinched areas, loose connections, etc. (examples in Figs. 2 and 3); If no damage is noted replace the N135 - Steering wheel electronics (LRE) and reassess. If fault code returns replace the steering wheel. B1E7713: Please check the wires and connections in the steering wheel. Afterwards, please check whether the complaint is caused by over torqued screws on steering wheel trim pieces. To do this, please loosen the screws slightly and reevaluate the situation. (Picture 4). P164456: Perform SCN coding. P1CA000: Perform an initial start-up on the N179 hand detection control unit. Faults in N62/4 - Driver assistance system (SG-FAS) control unit with U186B29, U0429E0, U042941, U042929, U042902, U0429E1: If no fault is stored in the N179 control unit: Scan steering wheel as indicated in the test procedure and check whether the fault is reproducible. If no fault code is stored in the hand detection control unit, the fault codes in the driver assistance systems control unit are precautionary messages. Software for the N62/4 - Driver assistance system (SG-FAS) is now available for Star 3 vehicles only. Fault in IDC223 control unit: U186B29: Delete fault memory and flash the new IDC (N62/4) software A223 902 75 37. If the software update is not available, or the problem persists, create a TIPS case.
Instrument Cluster Message for Active Emergency Stop Assist not active/Active Lane Keep Assist
Topic number
LI46.10-P-078012
Version
2
Function group
46.10 - Steering wheel, jacket tube, steering shaft, steering lock
Date
1/6/25
Validity
Vehicles with capacitive steering wheel with code 266
and manufacturing date as from 2020
Reason for change
Remedy adjusted
Complaint
Hand detection system not operating correctly / vehicles with code 266
Fault message in instrument cluster:
"Active Emergency Stop Assist not available"
"Active Lane Keeping Assist not available"
Cause
Possible causes: the hand detection mat, the hand detection control unit, the contacts and the steering wheel harness.
Remedy
Test Procedure:
Perform an initial quick test with freeze frame data. Save the N179 - Hand detection system (HE) and N62/4 - Driver
assistance system (SG-FAS) control unit logs. Note the fault frequency of fault codes set.
Delete the N179 and N62/4 fault memory.
Using both hands, "scan" the steering wheel all the way round, including the chrome molding at 6 o'clock (see Picture
1).
Read out fault memory and follow steps below for any faults set.
Remedy:
Vehicles with control unit N179 - Hand detection system (HE):
B1E7614:
Check contacts and wiring harness in steering wheel by carrying out a visual check for damage, pinched areas, loose connections, etc. (examples in Figs. 2 and 3); If no damage is noted replace the N135 - Steering wheel electronics
(LRE) and reassess. If fault code returns replace the steering wheel.
B1E7713:
Please check the wires and connections in the steering wheel. Afterwards, please check whether the complaint is
caused by over torqued screws on steering wheel trim pieces. To do this, please loosen the screws slightly and reevaluate the situation. (Picture 4).
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AG
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P164456:
Perform SCN coding.
P1CA000:
Perform an initial start-up on the N179 hand detection control unit.
Faults in N62/4 - Driver assistance system (SG-FAS) control unit with U186B29, U0429E0, U042941, U042929,
U042902, U0429E1:
If no fault is stored in the N179 control unit:
Scan steering wheel as indicated in the test procedure and check whether the fault is reproducible.
If no fault code is stored in the hand detection control unit, the fault codes in the driver assistance systems control unit
are precautionary messages.
Software for the N62/4 - Driver assistance system (SG-FAS) is now available for Star 3 vehicles only.
Fault in IDC223 control unit:
U186B29:
Delete fault memory and flash the new IDC (N62/4) software A223 902 75 37. If the software update is not available,
or the problem persists, create a TIPS case.
Attachments
File
Description
Picture 1.PNG
Picture 1 Hand Positions
Picture 2.PNG
Picture 2 Harness damaged
Picture 3.PNG
Picture 3 Harness damaged
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Picture 4.jpg
Picture 4 Screw connections
Disclaimer
NOTE: The information contained in this document is intended for use by trained, professional technicians with the
knowledge to properly and safely perform diagnosis and repairs on Mercedes-Benz vehicles, using Mercedes-Benz
approved tools and equipment. It informs service technicians about conditions that could occur in certain vehicles and
provides information that could assist in proper vehicle diagnosis, service, or repair. It does not indicate that a defect
is present in any vehicle referenced in this document nor does it imply warranty coverage. DO NOT assume that a
symptom or condition, or a described cause of a symptom or condition, affects any particular vehicle or groups of vehicles, or that a described repair applies to any particular vehicle or groups of vehicles. There can be multiple causes
resulting in the same or similar symptoms or conditions described in this document, and trained professional service
technicians must use their diagnostic skills to make evaluations on a case-by-case basis. The information contained
in this document does not guarantee warranty coverage nor does it extend the vehicle’s warranty in any way.
Symptoms
Chassis/suspension > Brake system > Brakes/traction regulation system > Brake assist system BAS > Display message > Brake assist - not available
Lighting > Exterior lights > Driving lights > Adaptive Highbeam Assist > Warning message in instrument cluster
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Communication/information > Assistance and warning systems > Active Steering Assist > Malfunction
Communication/information > Assistance and warning systems > Active Steering Assist > Warning message in instrument cluster
Control unit/fault code
Control unit
Fault text
N62/4 - Driver assistance system (SG-FAS) (IDC223)
U186B29 - Communication with control unit 'Hand detection system' has a malfunction. There is an invalid signal.
N62/4 - Mercedes-Benz Intelligent Drive (SG-FAS)
(IDC213)
U0429E1 - Implausible data were received from the steering column module. _
U042902 - Implausible data were received from the steering column module. There is a general signal fault.
U042929 - Implausible data were received from the steering column module. There is an invalid signal.
U042941 - Implausible data were received from the steering column module. There is a general checksum error.
U0429E0 - Implausible data were received from the steering column module. _
N179 - Hand detection system (HE) (HOSWD213)
P1CA000 - Initial startup was not performed. _
P164456 - An incorrect variant coding or configuration
was detected. An incorrect or incompatible configuration
was detected.
B1F1F04 - Control unit 'Hand-detection system' has a
malfunction. There is an internal fault.
B1E7713 - The ground connection of the control unit
'Hand detection system' has a malfunction. There is an
open circuit.
B1E7614 - The sensor mat of the control unit 'Hand detection system' has a malfunction. There is a short circuit
to ground or an open circuit.
N179 - Hand detection system (HE) (HOSWD223)
P1CA000 - Initial startup was not performed. _
P164456 - An incorrect variant coding or configuration
was detected. An incorrect or incompatible configuration
was detected.
B1F1F04 - Control unit 'Hand-detection system' has a
malfunction. There is an internal fault.
B1E7713 - The ground connection of the control unit
'Hand detection system' has a malfunction. There is an
open circuit.
B1E7614 - The sensor mat of the control unit 'Hand detection system' has a malfunction. There is a short circuit
to ground or an open circuit.
Operation numbers/damage codes
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Op. no.
Operation text
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© Copyright Mercedes-Benz AG
Time
CCUSHWA
Damage
code
Note
46248GI
Steering wheel - faulty hand detection system
46803
Hand detection control unit
5983Z
Contacts/line, hand detection control
unit
Page 5 / 5
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TSB/Document ID: LI46.10-P-078012
Replacement Service Bulletin Number:
MFR Communication Date: 2025-01-06
MFR Internal Campaign ID/Software Version:
Communication Type: Service Bulletin/Repair Instructions
NHTSA Components: LANE DEPARTURE: ASSIST
MFR Component System:
MFR Component Subsystem:
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