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Home >> Isuzu >> 2006 >> Ascender Limited, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 173 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Symptoms - Cellular Communication >> Notes

Symptoms - Cellular Communication: Notes

WARNING: This page is about a different car, the 2007 Isuzu Ascender, 2007 GMC Envoy, 2007 Chevrolet TrailBlazer, and 2007 Buick Rainier. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: The following steps must be completed before using the symptom tables.
  1. Perform the Diagnostic System Check - Vehicle in Vehicle DTC Information. Before using the Symptom Tables, verify that all of the following are true:
    • There are no DTCs set.
    • The control module can communicate via the serial data link.
  2. Review the system operation in order to familiarize yourself with the system functions. Refer to OnStar Description and Operation .
  3. Perform the OnStar Symptom Diagnosis . This symptom table will enable the user to verify the customer complaint and narrow it to its source.
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