OnStar Audio Malfunction
OnStar Audio Malfunction |
Diagnostic Instructions |
• |
Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
|
• |
Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
|
• |
Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
|
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® key is pressed, 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
• |
OnStar Schematics
|
• |
Radio/Navigation System Schematics
|
Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
• |
Circuit Testing
|
• |
Connector Repairs
|
• |
Testing for Intermittent Conditions and Poor Connections
|
• |
Wiring Repairs
|
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.
|
2. |
If audio is not heard clearly, refer to
Speaker Malfunction
.
|
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.
|
4. |
If OnStar® message is noisy or distorted, refer to Circuit/System Testing.
|
Circuit/System Testing |
1. |
Ignition OFF, disconnect the X1 harness connector at the radio.
|
2. |
Ignition ON, test for a varying AC voltage between the following signal circuit terminals listed below and ground when the OnStar® Call Center button is pressed.
|
• |
Audio Signal Circuit- terminal 20
|
• |
Audio Common Circuit- terminal 6
|
3. |
If AC voltage was not present, test the circuit for a short to voltage, short to ground, or an open/high resistance. If the circuit tests normal, replace the K73 telematics communication interface control module.
|
4. |
If all circuits test normal, replace the radio.
|
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.