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Home >> Cadillac >> 2016 >> XTS Base >> Repair and Diagnosis >> Engine Performance >> System >> Data Communication System >> Diagnostic Information and Procedures >> DTC U18B9-U18BF: Primary High Speed CAN Bus Subnet Configuration List/Secondary High Speed CAN Bus Subnet Configuration List >> Circuit/System Description
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Circuit/System Description

Devices on the high speed GMLAN serial data bus and the chassis high speed GMLAN serial data bus must be programmed with software that specifically identifies the correct type and quantity of devices on the bus based on RPO configuration. If a device was not properly configured after installation, the appropriate U Code may be set for that device. No external circuit diagnosis is involved.