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Home >> Mazda >> 2024 >> 3 Carbon Turbo, 4D Hatchback >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> On-Board Diagnostics - CMU (2 Of 2) >> DTC B1A11-2B: Rear Door Speaker (LH) Audio Output Circuit Malfunction >> Details On DTCs

Details On DTCs

B1A11-2B: (CMU) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Rear door speaker (LH) audio output circuit malfunction
Detection condition Determination conditions
  • The audio amplifier detects a short circuit between the rear door speaker (LH) audio output circuits.
Preconditions
  • Not applicable
Malfunction determination period
  • Not applicable
Fail-safe
  • Not applicable
Vehicle status when DTCs are output
  • Not applicable
Possible cause
  • DTCs are stored in the connectivity master unit (CMU). (Internal malfunction related DTCs are stored.)
  • DTCs are stored in the body control module (BCM). (Internal malfunction related DTCs are stored.)
  • DTC is stored in the connectivity master unit (CMU). (DTC related to the audio amplifier is stored.)
  • Malfunction in wiring harness (including connector/terminal) between rear door speaker (LH) and audio amplifier
  • Rear door speaker (LH) malfunction
  • Audio amplifier malfunction