DTC B1238-49: Audio Amplifier Internal Malfunction [Connectivity Master Unit]: Outline

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

DTC B1238:49 (CONNECTIVITY MASTER UNIT) 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 for 30 s.
Fail-safe	No audio output.
Possible cause	Audio amplifier malfunction
System wiring diagram	Not applicable
Connector diagram	Not applicable