When the Telematics Control Unit (TCU) replacement is necessary due to a failure, use MDARS to activate...
Mazda technical service bulletin SA-004-21c for 2019-2020 Mazda MAZDA3, 2021 Mazda CX-5 and 2021 Mazda CX-9 and others.
- Bulletin number
- SA-004-21c
- 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: 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.
Owners of these vehicles have filed 49 complaints in the electrical category.
Vehicles covered
- Mazda MAZDA3 2019-2020 20192020
- Mazda CX-5 2021 2021
- Mazda CX-9 2021 2021
- Mazda CX-30 2020-2021 20202021
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