PRE-RELEASE
OnStar Audio Malfunction
| OnStar Audio Malfunction |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
| Audio Signal | 1 | 1 | 1 | - |
| Audio Common Signal | - | 1 | - | - |
| 1. No (or Noisy) OnStar® Audio | ||||
| Circuit/System Description |
When an OnStar® keypress is made, a serial data message is sent to the audio system to mute all radio functions and output OnStar® originated audio. After the audio system is muted, the telematics communication interface control module transmits signals to the audio system on the audio signal and audio common circuits.
| Reference Information |
Schematic Reference
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OnStar Schematics
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Radio/Navigation System Schematics
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Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
| Circuit/System Verification |
| 1. |
Tune radio to a known good station and verify the audio is heard clearly through all speaker channels.
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| 2. |
If audio is not heard clearly, refer to
Speaker Malfunction
.
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| 3. |
Ignition ON, radio ON, set volume to comfortable level and press OnStar® Call Center button. Verify Connecting to OnStar® message is heard clearly through the audio system.
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| 4. |
If OnStar® message is noisy or distorted, refer to Circuit/System Testing.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the X1 harness connector at the radio.
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| 2. |
Disconnect the X2 harness connector at the K73 telematics communication interface control module.
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| 3. |
Ignition ON, test for less than 1 V between the K73 telematics communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
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| 4. |
If not the specified value, test the cellular telephone voice signal circuit for a short to voltage.
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| 5. |
Test for less than 1 V between the K73 telematics communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
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| 6. |
If not the specified value, test the cellular telephone voice low reference circuit for a short to voltage.
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| 7. |
Ignition OFF, test for infinite resistance between the K73 telematics communication interface control module cellular telephone voice signal circuit terminal 1 X2 and ground.
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| 8. |
If not the specified value, test the cellular telephone voice signal circuit for a short to ground.
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| 9. |
Test for infinite resistance between the K73 telematics communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and ground.
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| 10. |
If not the specified value, test the cellular telephone voice low reference circuit for a short to ground.
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| 11. |
Test for less than 2 Ω between the K73 telematics communication interface control module cellular telephone voice signal circuit terminal 1 X2 and the radio terminal 20 X1.
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| 12. |
If not the specified value, test the cellular telephone voice signal circuit for a open/high resistance.
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| 13. |
Test for less than 2 Ω between the K73 telematics communication interface control module cellular telephone voice low reference circuit terminal 2 X2 and the radio terminal 6 X1.
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| 14. |
If not the specified value, test the cellular telephone voice low reference circuit for a open/high resistance.
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| 15. |
If all circuits test normal, replace the K73 telematics communication interface control module.
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| 16. |
If all circuits test normal, replace the radio.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Control Module References for radio or telematics communication interface control module replacement, setup, and programming.
