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Home >> Chevrolet >> 2020 >> Spark LS, Automatic CVT Trans >> Repair and Diagnosis >> Engine Performance >> System >> Data Communications >> Diagnostic Information and Procedures >> DTC U1814 >> Circuit/System Description
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Circuit/System Description

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