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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> On-Board Diagnostic [Body Control System) >> DTC U3003:16 [BCM] >> Notes

DTC U3003:16 [BCM]: Notes

DTC U3003:16 BCM power supply circuit malfunction
DETECTION CONDITION 
  • BCM power supply circuit voltage is less than 9 V  for 5 s or more  when the ignition is switched to ON.
FAIL-SAFE FUNCTION 
  • Stops CAN communication and activates the application.
POSSIBLE CAUSE 
  • Battery malfunction
  • Generator malfunction
  • BCM connector or terminals malfunction
  • Open circuit or short to ground in BCM power supply circuit
    • Short to ground in wiring harness between the following:
      • METER 10 A fuse-BCM terminal 4T
      • ROOM 15 A fuse-BCM terminal 3J
      • HAZARD 10 A fuse-BCM terminal 4S
    • METER 10 A fuse malfunction
    • ROOM 15 A fuse malfunction
    • HAZARD 10 A fuse malfunction
    • Open circuit in wiring harness between the following:
      • Ignition switch (IG1)-BCM terminal 4T
      • Battery positive terminal-BCM terminal 3J
      • Battery positive terminal-BCM terminal 4S
  • BCM malfunction
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