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Home >> Dodge and Ram >> 2023 >> ProMaster 2500 >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio (Radio) (ETM) - DTCS B1400-11 To B157A-13 >> DTC Troubleshooting >> B143A-1A-Microphone 1 - Circuit Resistance Below Threshold >> Theory Of Operation

Theory Of Operation

The Radio controls and monitors both the microphone 1 input circuit (+) and the microphone 1 input circuit (-) for a concern. The Radio communicates over the CAN-Interior Bus. The microphone is located in the rearview mirror.