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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 189 (Data Communications - Diagnostic Information And Procedures (1 Of 3)) >> Diagnostic Information and Procedures >> DTC B1A1B (A11 Radio) >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

The Ethernet bus 2 is used to communicate between K56 Serial Data Gateway Module and A11 Radio. This Ethernet harness consists of a single twisted copper pair of wires (circuits 4757 & 4758) from point to point.