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Mazda TSB #09-033-20-3742
2020 Mazda MAZDA3
TSB Document:
Affected Component: ELECTRICAL SYSTEM
- Summary
- Some vehicles may exhibit that DTC B2002:49 will not clear with the Mazda Modular Diagnostic System (MMDS). Applicable vehicles are equipped with the Electrical supply unit (ESU) BCKA-67-5Z0B. � DTC B2002:49 [BODY CONTROL MODULE (BCM)] - Electrical supply unit (ESU) internal malfunction (No warning/indicator light illumination) This is caused by improper control software of the ESU. To eliminate this concern, the control software of the ESU has been modified.
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