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September 14, 2020 Service bulletin

When performing vehicle services such as control unit software update, control unit...

Mazda technical service bulletin SA-066-20 for 2019-2021 Mazda MAZDA3, 2021 Mazda CX-5 and 2021 Mazda CX-9 and others.

Bulletin number
SA-066-20
Component
Electrical system: 12v/24v/48v battery
Summary
When performing vehicle services such as control unit software update, control unit registration/activation, CMU log data retrieval, etc., always do the following:  Use the GR8 battery charger SST to maintain battery voltage. See SA-063/20.  Use M-MDS hardware that is in good working condition. CAUTION: If the GR8 is not used or if the M-MDS hardware is not in good working condition, a control unit failure may occur.

Owners of these vehicles have filed 56 complaints in the electrical category.

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