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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 393 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B19DA >> Circuit/System Description

Circuit/System Description

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The backup power source provides voltage to the K73 Telematic Control Module to be able to successfully place a call in the event of a main battery disconnect during a collision event. The Communication Interface Module Battery is under an access cover on the K73 Telematic Control Module.

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