Test Description
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2007 GMC Yukon XL, 2007 GMC Yukon, 2007 Chevrolet Tahoe, 2007 Chevrolet Suburban, and 2007 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
The number below refers to the step number on the diagnostic table.
- 8: If the cellular telephone voice low reference circuit is shorted to voltage the vehicle communication interface module (VCIM) has been damaged and requires replacement.
No (or Noisy) OnStar Audio
| 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 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
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 - Entertainment |
| 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 |
| 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 |