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Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 171 (Immobilizer System) >> Diagnostic Information and Procedures >> DTC B197F >> 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 Instrument Panel Cluster Control Module sends the BCM a message telling the BCM that the correct Instrument Panel Cluster Control Module is present. The message is sent and verified on every cycle of the key. If the BCM receives an incorrect response or no response at all, vehicle starting is disabled.

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