Navigation System - Voice Recognition Inoperative

Navigation System - Voice Recognition Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

Circuit/System Testing

1. Verify the OnStar(R) voice recognition is operating normally.

• If the OnStar(R) voice recognition is inoperative, refer to- Symptoms - Navigation Systems

2. Ignition OFF, disconnect the radio harness connector C2 and VCIM harness connector C3.
3. Test for less than 1 volt on the microphone out circuit radio harness connector terminal 4 and ground.

• If greater than specified value, repair short to voltage.

4. Test for greater than 1 ohm between the microphone out circuit radio harness connector terminal 4 and ground.

• If less than specified value, repair short to ground.

5. Test for less than 1 ohm between the low reference circuit radio harness connector terminal 4 and the low reference signal circuit VCIM harness connector terminal 2.
6. If greater than specified value, repair open circuit.
7. Test for less than 1 volt on the voice recognition audio signal circuit radio harness connector terminal 1 and ground.

• If greater than specified value, repair short to voltage.

8. Test for greater than 1 ohm between the voice recognition audio signal circuit radio harness connector terminal 1 and ground.

• If less than specified value, repair short to ground.

9. Test for less than 1 ohm between the voice recognition audio signal circuit radio harness connector terminal 1 and the voice recognition audio signal signal circuit VCIM harness connector terminal 2.

• If greater than specified value, repair open circuit.

10. If all circuits test normal, replace the radio.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

* Steering Wheel Control Switch Assembly Replacement
* Programming and RelearningProgramming and Relearning
* Mobile Telephone Microphone Replacement. Verification Tests