Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Chevrolet >> 2019 >> Sonic LS, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Data Communication System) >> Diagnostic Information and Procedures >> DTC U2099 >> Circuit/System Description

Circuit/System Description

WARNING: This page is about a different car, the 2018 Chevrolet Sonic. However, it is still accessible from the selected car via links, so may be relevant.

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.

scientia non olet · About Mike's Workshop Manuals