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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 218 (Transfer Case - BW 4474) >> Diagnostic Information and Procedures >> Service All-Wheel Drive Indicator Always On >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

If the service indicator needs to be turned on the transfer case shift control module sends a signal via the serial data line to the BCM which then sends a message to the instrument panel asking the I/P to command the Service AWD indicator.

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