DTC B1A32-13: Microphone Signal Circuit 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 B1A32:13 (CONNECTIVITY MASTER UNIT) DETECTION CONDITION AND POSSIBLE CAUSE

System malfunction location	Microphone signal circuit malfunction
Detection condition	The audio amplifier detects an open circuit in the microphone signal circuit or a disconnection with the microphone for 30 s.
Fail-safe	Not applicable
Possible cause	Microphone connector or terminal malfunction Audio amplifier connector or terminal malfunction Open circuit in microphone signal circuit Microphone malfunction Audio amplifier malfunction Connectivity master unit (CMU) malfunction
Courtesy of MAZDA MOTORS CORP.