Navigation System - Voice Guidance Malfunction

Navigation System - Voice Guidance 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 provides 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 A/C Compressor Clutch

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 X2 harness connector at the CIM.

2. Ignition ON, test for 8.5-9.5 volts between the mono out signal circuit terminal 1 and ground.

• If less than specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.

• If greater than specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.

3. Ignition OFF, test for less than 10 ohms between the mono out low reference circuit terminal 2 and ground.

• If greater than the specified range, test the low reference circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the radio.

4. Ignition ON, test for 8.5-9.5 volts between the mono out signal circuit terminal 1 and the drain wire circuit terminal 8.

• If less than specified range, test the drain wire circuit for a short to voltage or an open/high resistance.

5. Ignition OFF, disconnect the X2 harness connector at the radio.

6. Verify that a test lamp does not illuminate between B+ and the mono out low reference circuit terminal 15.

• If the test lamp illuminates, test the low reference circuit for a short to ground.

7. If all circuits test normal, replace the CIM.

Repair Instructions

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

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