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: Cellular 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 | Go to in Vehicle DTC Information |
2 |
Can the Connecting to OnStar message be heard playing through the audio system at all? | Go to Step 3 | Go to Step 6 |
3 | Tune the radio to a known good station. Can the audio be heard through all speaker channels? | Go to Step 4 | Go to Speaker problems in Entertainment |
4 | Test the cellular telephone mute signal circuit for an open/high resistancer, short to ground or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 5 |
5 | Test the cellular telephone voice low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 10 |
6 | Is any distortion heard? | Go to Step 8 | Go to Step 7 |
7 | Test the cellular telephone voice signal circuit for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 8 |
8 | Test the cellular telephone voice signal circuit for an open or a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 9 |
Test the cellular telephone voice low reference circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | Go to Step 11 | Go to Step 10 | |
10 | 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 in Wiring Systems. Did you find and correct the condition? | Go to Step 12 | Go to Step 11 |
11 | Replace the VCIM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the repair? | Go to Step 12 | -- |
12 | Operate the system in order to verify the repair. Did you find and correct the condition? | System OK | Go to Step 2 |
