Navigation System - Voice Recognition Malfunction

Navigation System - Voice Recognition Malfunction

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.

* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provide an overview of each diagnostic category.

Circuit/System Description

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

Reference Information

Schematic Reference

Radio/Navigation System Schematics Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views 5 Bow Lowered Switch (CM7)

Description and Operation

Radio/Audio System Description and Operation Radio/Audio System

Electrical Information Reference

* Circuit Testing Circuit Testing

* Connector Repairs Connector Repairs

* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections

* Wiring Repairs Wiring Repairs

Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

Ignition ON, 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.

Circuit/System Testing

1. Ignition OFF, disconnect the radio harness connector X5 and the CIM harness connector X3.

2. Test for less than 1 V on the voice recognition audio signal circuit radio harness connector terminal 3 and ground.

• If greater than the specified value, test the circuit for a short to voltage.

3. Test for greater than 1 ohms between the voice recognition audio signal circuit radio harness connector terminal 3 and ground.

• If less than the specified value, test the circuit for a short to ground.

4. Test for less than 1 ohms between the voice recognition audio signal circuit radio harness connector terminal 3 and the voice recognition audio signal circuit CIM harness connector terminal 2.

• If greater than the specified value, test the circuit for an open/high resistance.

5. Test for less than 1 V on the voice recognition audio low reference circuit radio harness connector terminal 5 and ground.

• If greater than the specified value, test the circuit for a short to voltage.

6. Test for greater than 1 ohms between the voice recognition audio low reference circuit radio harness connector terminal 5 and ground.

• If less than the specified value, test the circuit for a short to ground.

7. Test for less than 1 ohms between the voice recognition audio low reference circuit radio harness connector terminal 5 and the voice recognition audio low reference signal circuit CIM harness connector terminal 4.

• If greater than the specified value, test the circuit for an open/high resistance.

8. If all circuits test normal, replace the Communication Interface Module.

9. Verify that navigation radio voice commands are functional. If voice commands are not functional, replace the radio.

Repair Instructions

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

Control Module References Control Module References for Radio and CIM replacement, setup, and programming