With Telematics Communication System: 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 B119F:13 (CONNECTIVITY MASTER UNIT - US) DETECTION CONDITION AND POSSIBLE CAUSE - WITH TELEMATICS COMMUNICATION SYSTEM

System malfunction location	TEL antenna No. 1 signal circuit malfunction
Detection condition	The connectivity master unit (CMU) detects a short to power supply or open circuit in the TEL antenna No. 1 signal circuit.
Fail-safe	Not applicable
Possible cause	TEL antenna No. 1 connector or terminal malfunction Telematics communication unit connector or terminal malfunction Short to power supply in TEL antenna No. 1 signal circuit Open circuit in TEL antenna No. 1 signal circuit TEL antenna No. 1 malfunction Telematics communication unit malfunction Connectivity master unit (CMU) malfunction
Courtesy of MAZDA MOTORS CORP.