Test Description
The numbers below refer to the step numbers on the diagnostic table.
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This step determines if the OnStar® status LED has the necessary GREEN LED signal circuit voltage.
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If the GREEN LED signal is shorted to voltage, then the OnStar® 3-button assembly has been damaged and must be replaced.
Step | Action | Values | Yes | No |
|---|---|---|---|---|
Schematic Reference: OnStar Schematics Connector End View Reference: Entertainment/Communication Connector End Views DEFINITION: This procedure is for diagnosing problems with the OnStar® button assembly LED. | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Did the OnStar® status LED turn GREEN? | -- | Go to Testing for Intermittent Conditions and Poor Connections and Connector Repairs | Go to Step 3 |
Measure the voltage from the keypad GREEN LED signal circuit to a good ground. Does the voltage measure near the specified value? | 7 V | Go to Step 6 | Go to Step 4 | |
4 | Test the keypad GREEN LED signal circuit for an open, high resistance, or a short to ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 |
Test the keypad GREEN LED signal circuit for a short to voltage. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 7 | Go to Step 8 | |
6 | 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 10 | Go to Step 7 |
7 | Replace the rearview mirror. Refer to Inside Rearview Mirror Replacement . Did you complete the repair? | -- | Go to Step 10 | -- |
8 | 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 10 | Go to Step 9 |
9 | Replace the VCIM. Refer to Control Module References . Did you complete the repair? | -- | 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 |
