{"nhtsa_id":10166850,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2019-10-30","date":"2019-10-01","document_id":"DRW26","mfr_campaign":null,"replaces":null,"component":"EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; LATCHES/LOCKS/LINKAGES; ELECTRICAL SYSTEM","mfr_system":null,"summary":"Outline of concern: On certain subject vehicles, it is possible the following concerns may happen when the connectivity service is available. 1. The hands-free capability does not work properly due to a communication error between CMU (Connectivity master unit) and the microphone. 2. The communication failure happens between the TCU (Telematics Communication Unit) and connectivity server due to improper software of the TCU. 3. Door lock operation will work even though the key fob is inside of the vehicle. Outline of repair: Reprogram TCU and C-BCM with modified software, using a specific MDRT3 tool.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10166850-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2019/MC-10166850-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10166850","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null},{"id":"latches-locks","name":"Latches and locks","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MAZDA","model":"MAZDA3","year_from":2020,"year_to":2020,"match":"exact","vehicle_ids":["2020_mazda_mazda3"]}],"as_of":"2026-10-19","note":"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.","attribution":[]}