Test Description
The following procedure tests for poor performance or an inoperative hands-free microphone. The following numbers refer to the steps in the table.
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This step verifies that the OnStar® call is successfully connected. The call may take up to 3 minutes to complete.
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This step tests the operation of the microphone. The operator may say that this call is a "voice call with no data". This does not mean that the microphone is operating properly.
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This step tests the microphone circuit from the microphone to the vehicle interface unit (VIU).
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This step tests the microphone circuit between the VIU and the vehicle communication unit) VCU.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the OnStar® Diagnostic System Check? | -- | Go to Step 2 | Go to OnStar System Check |
Does the "Connecting to OnStar®" message play? | -- | Go to Step 3 | Go to OnStar System Check | |
When you hear the OnStar® Call Center operator, speak clearly into the OnStar® microphone. Can the operator hear you clearly? | -- | Go to Step 10 | Go to Step 4 | |
Is voltage near the specified value? | 9 volts | Go to Step 5 | Go to Step 7 | |
Test the XCVR MIC IN 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 10 | Go to Step 6 | |
6 | Replace the OnStar® microphone. Refer to Mobile Telephone Microphone Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
7 | Test the cellular telephone microphone signal circuit for a short or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 8 |
8 | Test the drain wire circuit for a short or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 9 |
9 | Replace the VIU. Refer to OnStar Vehicle Interface Unit Replacement . Did you complete the replacement? | -- | Go to Step 10 | -- |
10 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
