Skip to content
Tahoe / Yukon Service Manual

Symptoms - Wiring Systems

Wiring Systems and Power Management | Diagnostic Information and Procedures | Document ID: 5254908

  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 DTCs set. The control modules can communicate via the serial data links.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to: Power Mode Description and Operation Retained Accessory Power 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: Power Mode Mismatch Retained Accessory Power Malfunction