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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B13AB >> Circuit/System Description

Circuit/System Description

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The infotainment system has two WiFi antennas, one internal to the radio and one external, connected to the A11 Radio via coax cable. This diagnostic refers to the external T4TA Auxiliary Wireless Communication Interface Antenna. The internal antenna is for in-vehicle WiFi connections. The external antenna is for outside of the vehicle WiFi connections and mainly used for OTA (Over The Air) updates and as a backup to the internal antenna if too many devices are connected to the internal antenna at the same time. The A11 Radio supplies 5V through the coax cable to power the internal antenna amplifier.

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