{"nhtsa_id":10201858,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2021-10-05","date":"2021-09-13","document_id":"SA-004-21c","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM; EQUIPMENT","mfr_system":null,"summary":"When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate the new TCU after replacement. Use the information in this service alert to initialize the new TCU until the procedure on MGSS is updated. CAUTION: DO NOT swap TCU with another vehicle as the TCU is VIN locked after activation. A TCU swap with another vehicle will disable Connected Services on both vehicles. If TCU activation is not performed, connected vehicle functions will not operate. This will have a negative impact on the customer because they will need to return to the dealer for repairs.","document":{"url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10201858-0001.pdf","alternate_url":"https://static.nhtsa.gov/odi/tsbs/2021/MC-10201858-9999.pdf","confirmed":false},"url":"https://open.wenmarpro.com/bulletins/10201858","components":[{"id":"electrical","name":"Electrical system","parent":null},{"id":"equipment","name":"Equipment and accessories","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"MAZDA","model":"CX-30","year_from":2020,"year_to":2021,"match":"exact","vehicle_ids":["2020_mazda_cx-30","2021_mazda_cx-30"]},{"make":"MAZDA","model":"CX-5","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_mazda_cx-5"]},{"make":"MAZDA","model":"CX-9","year_from":2021,"year_to":2021,"match":"exact","vehicle_ids":["2021_mazda_cx-9"]},{"make":"MAZDA","model":"MAZDA3","year_from":2019,"year_to":2020,"match":"exact","vehicle_ids":["2019_mazda_mazda3","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":[]}