Test Description
The numbers below refer to the step numbers on the diagnostic table.
- 3: This step determines if the OnStar® status LED has the necessary GREEN LED signal circuit voltage.
- 5: If the GREEN LED signal is shorted to voltage, then the OnStar® 3-button assembly has been damaged and must be replaced.
OnStar Button LED Inoperative
| 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. |
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| 1 | Did you perform the Diagnostic System Check - Vehicle? | - | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 |
|
- | Go to Testing for Intermittent Conditions and Poor Connections and Connector Repairs | Go to Step 3 |
| 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 |
| 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 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
for replacement, setup, and programming. 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 |