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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 309 (Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC B144B: Run/Crank Power Relay Circuit >> Circuit/System Description

Circuit/System Description

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

The body control module (BCM) controls the ignition main relay through the control circuit by applying voltage to the ignition run/crank relay coil control circuit. The ignition main relay is energized when the ignition is in the ON or when a remote start is requested.

The keyless entry control module controls the backup power for the ignition main relay through the control circuit by applying voltage to the ignition circuit. This circuit is a pass-thru in the BCM and will energize the ignition circuit when the ignition is ON, or when a remote start is requested.

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