{"nhtsa_id":11018204,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2025-05-09","date":"2025-05-02","document_id":"LI46.10-P-078012","mfr_campaign":null,"replaces":null,"component":"FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING; LANE DEPARTURE: ASSIST; STEERING","mfr_system":null,"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).","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018204-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2025/MC-11018204-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/11018204","components":[{"id":"driver-assistance","name":"Driver assistance","parent":null},{"id":"steering","name":"Steering","parent":null},{"id":"lane-keeping","name":"Lane departure and lane keeping","parent":"driver-assistance"}],"codes":["B1E76","B1E77","B1F1F","U0429","U186B"],"topics":[],"vehicles":[{"make":"MERCEDES","model":"EQA","year_from":2021,"year_to":2021,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"A 220","year_from":2020,"year_to":2022,"match":null,"vehicle_ids":[]},{"make":"MERCEDES-BENZ","model":"AMG 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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.","attribution":[]}