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Home >> Cadillac >> 2017 >> XT5 Base >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Data Communication System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC U1653: Chassis Systems 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 vehicle power mode is in ACCESSORY mode or Ignition ON/Vehicle In Service mode. The ignition circuit wakes up the devices for serial data bus communication.

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