Buick Regal: 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.
- Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
Diagnostic Fault Information
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
- Refer to OnStar/Telematics Wiring Schematics
- Refer to Radio/Navigation System Wiring Schematics (IOB) ,
Radio/Navigation System
Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics
(IO5/IO6) , or
Radio/Navigation System Wiring Schematics (IOS/IOT)
Connector End View Reference
Component Connector End View Index
Description and Operation
OnStar Description and Operation (UE1 with IOB/IO6) , OnStar Description
and Operation (UI3)
, or OnStar Description and Operation (UE1 without IOB/IO6).
Electrical Information Reference
- Refer to Circuit Testing
- Refer to Connector Repairs
- Refer to Testing for Intermittent Conditions and Poor Connections
- Refer to Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Circuit/System Verification
1. Ignition ON/vehicle in Service Mode, radio ON.
2. Verify that audio is heard clearly through all speaker channels when tuning
radio to a known good
station.
- If audio is not heard clearly
Refer to Speaker Malfunction (UQ3 without NKC), Speaker Malfunction (UQ3
with
NKC), Speaker Malfunction (UQA with IO5/IO6), or Speaker Malfunction (UQA
without IO5/IO6)
- Go to next step: If audio is heard clearly
3. Verify that the Connecting to OnStar message is heard clearly through
the audio system when
the OnStar blue button is pressed.
- If OnStar message is noisy or distorted
Refer to Circuit/System Testing
- Go to next step: If OnStar message is heard clearly
4. All OK.
Circuit/System Testing
1. Ignition OFF/vehicle OFF, and all vehicle systems OFF, disconnect the X2
harness connector at
the K73 Telematics Communication Interface Control Module, ignition ON/vehicle
in Service
Mode.
2. Test for less than 4 V between each of the signal circuits listed below and
ground:
- Terminal 1
- Terminal 2
- If 4 V or greater
- Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11
Radio, ignition
ON/vehicle in Service Mode.
- Test for less than 1 V between the signal circuits and ground.
- If greater than 1 V, repair the short to voltage on the circuit.
- If less then 1 V, replace the A11 Radio.
- Go to next step: If less than 4 V
3. Ignition OFF/vehicle OFF.
4. Test for infinite resistance between each of the signal circuits listed below
and ground:
- Terminal 1
- Terminal 2
- If less than infinite resistance
Repair the short to ground on the circuit.
- Go to next step: If infinite resistance
5. Disconnect the X1 harness connector at the A11 Radio.
6. Test for less than 2 Ω in each of the signal circuits listed below end to
end:
- K73 Telematics Communication Interface Control Module Terminal 1 X2
- K73 Telematics Communication Interface Control Module Terminal 2 X2
- If 2 Ω or greater
Repair the open/high resistance on the circuit.
- Go to next step: If less than 2 Ω
7. Replace the K73 Telematics Communication Interface Control Module.
8. Verify that the Connecting to OnStar message is heard clearly through the
audio system when
the OnStar blue button is pressed.
- If audio is not heard clearly
Replace the A11 Radio.
- Go to next step: If audio is heard clearly
9. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
Control Module References for radio or telematics communication interface
control module
replacement, programming, and setup.
READ NEXT:
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.
Refe
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.
Refe
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.
Refe
SEE MORE:
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.
DTC Descriptor
DT
Introduction
The Tire Pressure Rolling Count parameter for each sensor can be used to help
confirm if the sensor transmissions
are being received. As the vehicle is being driven, the Tire Pressure Rolling
Count increments with every received
TPM sensor transmission. If a suspected Sensor is not in