Navigation System - Voice Recognition Malfunction

Navigation System - Voice Recognition Malfunction

Diagnostic Instructions

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

Circuit/System Description

The vehicle navigation radio and the Onstar(R) system both utilize the cellular microphone to receive voice commands. The navigation radio receives an audio voice signal from the vehicle communication interface module (VCIM).

Reference Information
Schematic Reference

Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Navigation System Description and Operation (Navigation System Description and Operation)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)

Circuit/System Testing

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

• If the OnStar(R) voice recognition is inoperative, refer to OnStar Microphone Malfunction (OnStar Microphone Malfunction).

2. Ignition OFF, disconnect the radio harness connector X1 and VCIM harness connector X3.
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 microphone out circuit radio harness connector terminal 4 and the microphone out 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 low reference circuit radio harness connector terminal 5 and ground.

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

8. Test for greater than 1 ohm between the low reference circuit radio harness connector terminal 5 and ground.

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

9. Test for less than 1 ohm between the low reference circuit radio harness connector terminal 5 and the low reference signal circuit VCIM harness connector terminal 4.

• If greater than specified value, repair open circuit.

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

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning)for radio replacement, setup, and programming