When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate...
Mazda technical service bulletin SA-004-21b for 2019-2021 Mazda MAZDA3 and 2020-2021 Mazda CX-30.
- Bulletin number
- SA-004-21b
- Component
- Electrical system
- 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: 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.
Owners of these vehicles have filed 40 complaints in the electrical category.
Vehicles covered
- Mazda MAZDA3 2019-2021 201920202021
- Mazda CX-30 2020-2021 20202021
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