C 1500 Yukon 2WD V8-5.3L VIN T (2002)
Information Bus: Description and Operation
Data Link Communications
DATA LINK COMMUNICATIONS CIRCUIT DESCRIPTION AND OPERATION
The Class 2 serial data link allows modules to transmit, receive, or exchange data between each other:
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HVAC Control Module (HCM)
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Rear Wheel Steering Module (RWS)
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Suspension Control Module (SCM)
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Active Transfer Case (ATC)
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Electronic Brake Control Module (EBCM)
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Powertrain Control Module (PCM)
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Transmission Control Module (TCM)
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OnStar(R) Module (ONS)
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Body Control Module (BCM)
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Instrument Panel Cluster (IPC)
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Driver Information Center (DIC)
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Mirror Memory Module (MMM)
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Memory Seat Module (MSM)
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Inflatable Restraint Sensing And Diagnostic Module (SDM)
CIRCUIT DESCRIPTION
Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information
and commands are exchanged among the modules. In addition to this, Node Alive messages are transmitted by each module on the class 2 serial data
circuit about once every 2 seconds. When the module detects the class 2 serial data circuit shorted, the setting of all other class 2 serial communication
DTCs is inhibited and a U1300, U1301, or a U1305 DTC will set.
