Test Description
This procedure is for diagnosing problems with the OnStar® button assembly. The following numbers refer to the steps in the table.
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Tests for proper operation of the OnStar® Center button.
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Tests for proper operation of the OnStar® Call Answer/Call End button.
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Tests for proper operation of the OnStar® Emergency button.
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Determines if the OnStar® button assembly has the necessary power and signal circuits.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the OnStar® Diagnostic System Check? | -- | Go to Step 2 | Go to OnStar System Check |
2 | Did you check the audio system for proper operation? | -- | Go to Step 3 | Go to OnStar System Check |
Does "Connecting to OnStar®" play through the audio system? | -- | Go to Step 4 | Go to Step 6 | |
Does "OnStar® Request Ended" play through the audio system? | -- | Go to Step 5 | Go to Step 7 | |
Does "Connecting to OnStar® Emergency" play through the audio system? | -- | Go to Step 14 | Go to Step 8 | |
6 |
Does the resistance measure near the specified value? | 3.0 Kohms | Go to Step 9 | Go to Step 12 |
7 |
Does the resistance measure near the specified value? | 13 Kohms | Go to Step 9 | Go to Step 12 |
8 |
Does the resistance measure near the specified value? | 1.5 Kohms | Go to Step 9 | Go to Step 12 |
Measure the voltage at the OnStar® keypad between keypad power circuit and the keypad signal circuit. Does the voltage measure near the specified value? | 3V | Go to Step 13 | Go to Step 10 | |
10 | Test the keypad power circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the problem? | -- | Go to Step 14 | Go to Step 11 |
11 | Test the keypad signal circuit. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Did you find and correct the problem? | -- | Go to Step 14 | Go to Step 13 |
12 | Replace the OnStar® three button assembly. Refer to OnStar Button Assembly Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
13 | Replace the vehicle interface unit (VIU). Refer to OnStar Vehicle Interface Unit Replacement . Did you complete the replacement? | -- | Go to Step 14 | -- |
14 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
