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Home › Jeep › 2021 › Compass Altitude, 4WD › Repair and Diagnosis › General Information › OEM General Information › (Global Telematics Box Module - Electrical Diagnostics) › DTC Troubleshooting › B143A-13-Microphone 1-Circuit Open › Set Condition

Set Condition

The Global Telematics Box Module (TBM2) detects an open on either the Emergency Microphone (+), Emergency Microphone (-), Microphone 1 (+), and Microphone 1 (-) circuits.