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Tahoe / Yukon Service Manual

Symptoms - Data Communications

  1. Perform the Diagnostic System Check - Vehicle before using the symptom tables in order to verify that all of the following are true: There are no Diagnostic Trouble Codes (DTC) set. The devices can communicate via the serial data links.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to Data Link Communications Description and Operation. Visual/Physical Inspection Inspect for aftermarket devices which could affect the operation of the systems. Refer to Checking Aftermarket Accessories. Inspect the easily accessible or visible system components for obvious damage or conditions which could cause the symptom. Intermittent Faulty electrical connections or wiring may be the cause of intermittent conditions. Refer to Testing for Intermittent Conditions and Poor Connections. Symptom List Refer to a symptom diagnostic procedure from the following list in order to diagnose the symptom: Scan Tool Does Not Power Up Scan Tool Does Not Communicate with Vehicle Scan Tool Does Not Communicate with Device on CAN 1 Scan Tool Does Not Communicate with Device on CAN 2 Scan Tool Does Not Communicate with Device on CAN 3 Scan Tool Does Not Communicate with Device on CAN 4 Scan Tool Does Not Communicate with Device on CAN 5 Scan Tool Does Not Communicate with Device on CAN 8