Test Description
The following numbers refer to the steps on the diagnostic table.
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Determines if the OnStar® status LED has the necessary GRN LED signal circuit.
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If the GRN LED signal is shorted to voltage then the OnStar® three button assembly has been damaged. The OnStar® three button assembly has to be replaced.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: OnStar Schematics DEFINITION: OnStar® LED is inoperative. This procedure is for diagnosing problems with the OnStar® button assembly. | ||||
1 | Did you perform the OnStar® Diagnostic System Check? | -- | Go to Step 2 | |
2 |
Did the OnStar® status LED turn GREEN? | -- | Go to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems | Go to Step 3 |
Does the voltage measure near the specified value? | 7-9 V | Go to Step 6 | Go to Step 4 | |
4 | Test the keypad GRN LED signal circuit for an open, high resistance or a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the condition? | -- | Go to Step 10 | Go to Step 5 |
Test the keypad GRN LED signal circuit for an 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 OnStar® button assembly. 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 10 | Go to Step 7 |
7 | Replace the OnStar® button assembly. Refer to OnStar Button Assembly Replacement . Did you complete the repair? | -- | Go to Step 10 | -- |
8 | Inspect for poor connections at the harness connector of the VIU. 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 10 | Go to Step 9 |
9 |
Important: Perform the OnStar® setup procedure. Replace the vehicle interface unit (VIU). Refer to OnStar Vehicle Communication Unit Replacement and OnStar Vehicle Interface Unit Replacement . 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 |
