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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Wiring Systems And Power Management - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B1AC4 >> Circuit/System Description

Circuit/System Description

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The K9 Body Control Module (BCM) controls the KR124 Trailer Ignition Power Relay coil control circuit 5486, by applying voltage when the Ignition in Service Mode or engine running. The relay is grounded by ground circuit 2550. The K9 Body Control Module (BCM) Monitors the control circuit 5486 to determine proper operation.

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