# Service bulletin LI46.10\-P\-078012 A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned. - Type: Service bulletin - NHTSA id: 11018204 - Published by NHTSA: 2025\-05\-09 - Manufacturer's number: LI46.10\-P\-078012 - Manufacturer's date: 2025\-05\-02 - NHTSA component: FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; LANE DEPARTURE: ASSIST; STEERING ## NHTSA's 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 In the event of a customer complaint and fault code in IDC control unit: U186B29 in IDC223 or fault code U0429E0, U042941, U042929, U042902, U0429E1 in IDC213 or fault code in HOSWD control unit: B1E7614 Test: Please perform the new SCN coding for HOSWD control unit \(N179/1\) \(available since May 2025\). Please flash the IDC \(N62/4\) software A223 902 75 37 \(only applies to HOSWD223\). Erase fault memory Remedy: Switch on ignition without touching the steering wheel. If after 10 seconds without touching the steering wheel, one of the two fault messages appears in the IC: Please check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. \(example in picture 2 and 3\). If there is visible damage \-\> replace steering wheel electronics or feed lines. If there is no visible damage \-\> Please create TIPS case\! If no yellow message appears in the instrument cluster within 10 seconds: Please grab the steering wheel all the way round, including the 6 o'clock chrome molding, with both hands \(see picture 1\). If the fault is triggered by grabbing the steering wheel rim or pressing on the 6 o'clock clasp, check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. \(example in picture 2 and 3\). Check ground connections \(screw connections and cable to steering wheel rim\); if necessary tighten screws/bolts and check for corrosion \(Picture 4\). If there is visible damage \-\> replace steering wheel electronics or feed lines. If no fault is visible: Please open a TIPS case\! In the event of a customer complaint and further fault code in HOSWD: B1E7713: Check ground connections \(screw connections and cable to steering wheel rim\); if necessary tighten screws/bolts and check for corrosion \(Picture 4\). B1F1F04: Check hand detection system control unit; if necessary swap with donor vehicle \(ensure that the HW part numbers are identical\). ## The document - [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018204-0001.pdf) - [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11018204-9999.pdf) The document is the manufacturer's. This site does not hold it. ## Components Driver assistance, Steering, Lane departure and lane keeping ## Trouble codes named B1E76, B1E77, B1F1F, U0429, U186B ## Vehicles listed - 2021 MERCEDES EQA - 2020 to 2022 MERCEDES\-BENZ A 220 - 2020 to 2021 MERCEDES\-BENZ AMG A35 - 2023 to 2024 MERCEDES\-BENZ AMG C43 - 2023 MERCEDES\-BENZ AMG C43 4MATIC - 2024 MERCEDES\-BENZ AMG C63 S E - 2020 to 2024 MERCEDES\-BENZ AMG CLA35 - 2020 to 2024 MERCEDES\-BENZ AMG CLA45 - 2024 MERCEDES\-BENZ AMG CLE53 - 2020 to 2021 MERCEDES\-BENZ AMG CLS53 - 2025 MERCEDES\-BENZ AMG E 53 4MATIC\+ WAGON - 2021 to 2023 MERCEDES\-BENZ AMG E53 - 2023 MERCEDES\-BENZ AMG E63 S - 2020 to 2021 MERCEDES\-BENZ AMG E63S - 2023 to 2024 MERCEDES\-BENZ AMG EQE - 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC - 2022 to 2024 MERCEDES\-BENZ AMG EQS - 2024 to 2025 MERCEDES\-BENZ AMG GLA 35 - 2024 MERCEDES\-BENZ AMG GLA 45S - 2021 to 2023 MERCEDES\-BENZ AMG GLA35 - 2021 to 2023 MERCEDES\-BENZ AMG GLA45 - 2024 MERCEDES\-BENZ AMG GLC43 - 2021 to 2022 MERCEDES\-BENZ AMG GLE53 - 2023 to 2024 MERCEDES\-BENZ AMG GLE53 4MATIC\+ - 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S - 2023 to 2024 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+ - 2020 to 2022 MERCEDES\-BENZ AMG GLS63 - 2023 to 2024 MERCEDES\-BENZ AMG GLS63 4MATIC\+ - 2024 MERCEDES\-BENZ AMG GT55 - 2024 MERCEDES\-BENZ AMG GT63 - 2025 MERCEDES\-BENZ AMG GT63 S E - 2023 to 2025 MERCEDES\-BENZ AMG S 63 E 4MATIC\+ - 2023 to 2024 MERCEDES\-BENZ AMG SL43 - 2022 to 2024 MERCEDES\-BENZ AMG SL55 - 2022 to 2023 MERCEDES\-BENZ AMG SL63 - 2024 to 2025 MERCEDES\-BENZ AMG SL63 S E - 2022 to 2025 MERCEDES\-BENZ C 300 - 2020 to 2024 MERCEDES\-BENZ CLA 250 - 2024 MERCEDES\-BENZ CLE 300 - 2024 MERCEDES\-BENZ CLE 450 - 2020 to 2023 MERCEDES\-BENZ CLS 450 - 2020 to 2025 MERCEDES\-BENZ E 350 - 2025 MERCEDES\-BENZ E 350 4MATIC - 2021 to 2024 MERCEDES\-BENZ E 450 - 2025 MERCEDES\-BENZ E 450 4MATIC - 2025 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN - 2023 to 2025 MERCEDES\-BENZ EQB 250\+ - 2022 to 2025 MERCEDES\-BENZ EQB 300 4MATIC - 2022 to 2025 MERCEDES\-BENZ EQB 350 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQE 350 4MATIC - 2023 to 2024 MERCEDES\-BENZ EQE 350\+ - 2023 to 2024 MERCEDES\-BENZ EQE 500 - 2023 MERCEDES\-BENZ EQE 500 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQE SUV 350 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQE SUV 350\+ - 2023 to 2025 MERCEDES\-BENZ EQE SUV 500 4MATIC - 2023 MERCEDES\-BENZ EQS 450 4MATIC - 2022 to 2024 MERCEDES\-BENZ EQS 450\+ - 2022 to 2024 MERCEDES\-BENZ EQS 580 - 2023 to 2025 MERCEDES\-BENZ EQS SUV 450 4MATIC - 2023 to 2025 MERCEDES\-BENZ EQS SUV 450\+ - 2023 to 2025 MERCEDES\-BENZ EQS SUV 580 4MATIC - 2021 to 2025 MERCEDES\-BENZ GLA 250 - 2023 to 2025 MERCEDES\-BENZ GLC 300 - 2024 MERCEDES\-BENZ GLC 300 COUPE - 2025 MERCEDES\-BENZ GLC 300E - 2025 MERCEDES\-BENZ GLC 350 E 4MATIC - 2020 to 2024 MERCEDES\-BENZ GLE 350 - 2025 MERCEDES\-BENZ GLE 350 4MATIC - 2020 to 2024 MERCEDES\-BENZ GLE 450 - 2024 to 2025 MERCEDES\-BENZ GLE 450E 4MATIC - 2020 to 2021 MERCEDES\-BENZ GLE 580 - 2022 to 2024 MERCEDES\-BENZ GLE 580 4MATIC - 2020 MERCEDES\-BENZ GLS 450 - 2022 to 2024 MERCEDES\-BENZ GLS 450 4MATIC - 2020 MERCEDES\-BENZ GLS 580 4MATIC - 2022 to 2024 MERCEDES\-BENZ GLS 580 4MATIC - 2023 MERCEDES\-BENZ GLS 600 - 2021 MERCEDES\-BENZ GLS450 - 2021 MERCEDES\-BENZ GLS580 - 2021 MERCEDES\-BENZ S 500 - 2023 MERCEDES\-BENZ S 500 - 2022 to 2024 MERCEDES\-BENZ S 500 4MATIC - 2021 MERCEDES\-BENZ S 580 - 2023 MERCEDES\-BENZ S 580 - 2022 to 2024 MERCEDES\-BENZ S 580 4MATIC - 2023 MERCEDES\-BENZ S 580 E - 2023 to 2024 MERCEDES\-BENZ S 580 E 4MATIC - 2023 to 2024 MERCEDES\-BENZ redundant EQS 450 - 2024 to 2025 MERCEDES\-MAYBACH EQS SUV 680 4MATIC - 2021 MERCEDES\-MAYBACH GLS 600 - 2022 to 2024 MERCEDES\-MAYBACH GLS 600 4MATIC - 2021 MERCEDES\-MAYBACH S 580 - 2022 to 2024 MERCEDES\-MAYBACH S 580 4MATIC - 2023 to 2024 MERCEDES\-MAYBACH S 680 - 2022 to 2023 MERCEDES\-MAYBACH S 680 4MATIC ## Other bulletins for the same vehicles and component - [LI46.10\-P\-078012](/bulletins/11021143.md), 2025-08-01, Service bulletin: LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL. 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 In the event of a customer complaint and fault code in IDC control unit: U186B29 in IDC223 or fault code U0429E0, U042941, U042929, U042902, U0429E1 in IDC213 or fault code in HOSWD control unit: B1E7614 Test: Please perform the new SCN coding for HOSWD control unit \(N179/1\) \(available since May 2025\). Please flash the IDC \(N62/4\) software A223 902 75 37 \(only applies to HOSWD223\). Erase fault memory Remedy: Switch on ignition without touching the steering wheel. If after 10 seconds without touching the steering wheel, one of the two fault messages appears in the IC: Please check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. \(example in picture 2 and 3\). If there is visible damage \-\> replace steering wheel electronics or feed lines. If there is no visible damage \-\> Proceed to replace the steering wheel. If no yellow message appears in the instrument cluster within 10 seconds: Please grab the steering wheel all the way round, including the 6 o'clock chrome molding, with both hands \(see picture 1\). If the fault is triggered by grabbing the steering wheel rim or pressing on the 6 o'clock clasp, check contacts and feed lines in the steering wheel by means of visual inspection for damage, crimped connections, loose connections, etc. \(example in picture 2 and 3\). Check ground connections \(screw connections and cable to steering wheel rim\); if necessary tighten screws/bolts and check for corrosion \(Picture 4\). If there is visible damage \-\> replace steering wheel electronics or feed lines. If no fault is visible \-\> Proceed to replace the steering wheel. In the event of a customer complaint and further fault code in HOSWD: B1E7713: Check ground connections \(screw connections and cable to steering wheel rim\); if necessary tighten screws/bolts and check for corrosion \(Picture 4\). B1F1F04: Check hand detection system control unit; if necessary swap with donor vehicle \(ensure that the HW part numbers are identical\). - [OTA \- 20250725](/bulletins/11020951.md), 2025-07-29, Over\-the\-air update: LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; LANE DEPARTURE: WARNING. Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has updated driver assistance system software available for certain subject vehicles. The updated software improves system stability and enhances the robustness of the driver assistance system. MBUSA will conduct an OTA service campaign. Remote software updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit. - [OTA \- 20250627](/bulletins/11019782.md), 2025-06-27, Over\-the\-air update: LANE DEPARTURE: ASSIST; LANE DEPARTURE: WARNING; FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL; ELECTRICAL SYSTEM. Mercedes\-Benz AG, the manufacturer of Mercedes\-Benz vehicles, has updated driver assistance system SCN coding available for certain subject vehicles. The updated SCN coding improves system stability and enhances the availability of driver assistance features. MBUSA will conduct an OTA service campaign. Remote SCN coding updates are automatically downloaded and installed in the customer’s vehicle free of charge and do not require a dealer visit. - [LI46.10\-P\-078012](/bulletins/11013996.md), 2025-02-07, Service bulletin: LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM; FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING. 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. Fault in IDC213 control unit: U0429E0, U042941, U042929, U042902, U0429E1: If no fault is stored in the HOSWD control unit then scan the steering wheel and check whether the fault is reproducible. If reproducible: Create a TIPS case, adding the note "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. New coding parameters \(SCN\) will be available in Q2/2025 for the HOSWD control unit. - [LI46.10\-P\-078012](/bulletins/11012806.md), 2025-01-10, Service bulletin: LANE DEPARTURE: ASSIST; ELECTRICAL SYSTEM. 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. 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