Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: OnStar Schematics Connector End View Reference: Entertainment/Communication Connector End Views DEFINITION: The OnStar® Call Center operator can clearly be heard but the operator is unable to hear the caller. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Does the OnStar® operator hear your voice? | -- | Go to Testing for Intermittent Conditions and Poor Connections | Go to Step 3 |
3 |
Does the voltage measure greater than the specified value? | 9 V | Go to Step 4 | Go to Step 5 |
4 | Measure the voltage from the cellular microphone signal circuit to the cellular microphone low reference circuit. Does the voltage measure greater than the specified value? | 9 V | Go to Step 7 | Go to Step 6 |
5 | Test the cellular microphone signal circuit for an open or short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 8 |
6 | Test the cellular microphone low reference circuit for an open. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 |
7 | Test the cellular microphone low reference circuit for a short to ground. Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 10 |
8 |
Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 9 |
9 | Inspect for poor connections at the harness connector of the rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 12 |
10 | Inspect for poor connections at the harness connector of the communication interface module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 13 | Go to Step 11 |
11 | Replace the rearview mirror assembly. Refer to Inside Rearview Mirror Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
12 |
Important: Perform the OnStar® setup procedure. Replace the VCIM. Refer to Communication Interface Module Replacement . Did you complete the replacement? | -- | Go to Step 13 | -- |
13 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
