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Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 323 (Data Communication System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC U1814: Powertrain Wake-Up Communication Circuit >> Circuit/System Description

Circuit/System Description

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The body control module (BCM) activates the ignition circuit, when the ignition key is in ACC, ON or START. The ignition circuit wakes up the devices for serial data bus communication.

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