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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Data Link Communication System >> Diagnostic Information & Procedures >> DTC U1300, U1301 OR U1305: No Valid Messages Are Detected On The Class 2 Serial Data Circuit >> Symptoms - Data Link Communications

Symptoms - Data Link Communications

IMPORTANT: The following steps must be completed before using the symptom tables:
  1. Perform the diagnostic system check for the subsystem exhibiting the symptoms. The subsystem diagnostic system check will identify where to begin diagnosis of the data link communication system.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to DATA LINK COMMUNICATIONS DESCRIPTION & OPERATION .
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