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Home >> Mazda >> 2024 >> 3 Carbon Turbo, 4D Hatchback >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> On-Board Diagnostics - CMU (1 Of 2) >> DTC B1238-49: Audio Amplifier Internal Malfunction

DTC B1238-49: Audio Amplifier Internal Malfunction

B1238-49: (CMU) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location Audio amplifier internal malfunction
Detection condition
  • The connectivity master unit (CMU) detects an internal malfunction in the audio amplifier.
Fail-safe
  • Not applicable
Possible cause
  1. Audio amplifier malfunction (Refer to AUDIO AMPLIFIER REMOVAL/INSTALLATION in service information.)
Repeatability verification procedure
  1. Clear the DTC recorded in the memory. (See CLEARING DTC.)
  2. Switch the ignition ON (engine off or on)/main power ON (READY off or on) and wait for 30 s or more.
System wiring diagram
  • Not applicable