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Home >> GMC >> 2017 >> Terrain SLE, 3.6L Eng VIN 3, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U2099: High Speed Communication Enable Circuit >> Circuit/System Description
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Circuit/System Description

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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