Step | Action | Yes | No |
|---|---|---|---|
Schematic Reference: OnStar Schematics | |||
1 | Did you perform the OnStar® Diagnostic System Check? | Go to Step 2 | |
2 |
Does "Connecting to OnStar®" play through the audio system? | Go to Step 11 | Go to Step 3 |
3 | Tune the radio to a known good station. Can the audio be heard through all speaker channels? | Go to Step 4 | Refer to Diagnostic Starting Point - Entertainment in Entertainment |
4 | Does the audio system mute? | Go to Step 6 | Go to Step 5 |
5 | Test the entertainment and comfort serial data circuit for an open or a short. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
6 | Test the remote playback device audio common signal circuit for short, an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 7 |
7 | Test the remote playback device right audio signal circuit for short to ground, an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 8 |
8 | Test the remote playback device left audio signal circuit for short to ground, an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the vehicle interface unit (VIU). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 |
10 |
Important: Perform the OnStar® setup procedure. Replace the VIU. Refer to OnStar Vehicle Interface Unit Replacement . 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 | -- |
