Test Description
The number below refers to the step number on the diagnostic table.
Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: OnStar Schematics Connector End View Reference: Entertainment/Communication Connector End Views DEFINITION: This procedure is for diagnosing problems during OnStar® audio following a button press from the OnStar® button assembly. | |||
1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | |
2 |
Can the Connecting to OnStar message be heard playing through the audio system at all? | Go to Step 3 | Go to Step 5 |
3 | Tune the radio to a known good station. Can the audio be heard through all speaker channels? | Go to Step 4 | Go to Diagnostic Starting Point - Cellular, Entertainment, and Navigation |
4 | Test the cellular telephone voice low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
5 | Is any distortion heard? | Go to Step 7 | Go to Step 6 |
6 | Test the cellular telephone voice signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
7 | Test the cellular telephone voice signal circuit for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
Test the cellular telephone voice low reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | Go to Step 10 | Go to Step 9 | |
9 | Inspect for poor connections at the harness connector of the vehicle communication interface module (VCIM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
10 | Replace the VCIM. Refer to Control Module References for replacement, setup, and programming. Did you complete the repair? | Go to Step 11 | -- |
11 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |
