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DTC U3000:04 [BCM]: Notes

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
DETECTION CONDITION AND POSSIBLE CAUSE

DESCRIPTION  BCM internal malfunction 
DETECTION CONDITION 
  • BCM internal ECU is faulted
POSSIBLE CAUSE 
  • BCM malfunction