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 provide an overview of each diagnostic category.

Circuit/System Description

The vehicle navigation radio provides verbal directions to the driver through the radio speakers. The navigation radio sends an audio voice signal to the amplifier on two dedicated circuits.

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
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

Circuit/System Testing

1. Ignition OFF, disconnect the radio harness connector X4 and amplifier harness connector X3.
2. Test for less than 1 volt on the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.

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

3. Test for greater than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.

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

4. Test for less than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and the amplifier harness connector terminal 13.

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

5. Test for less than 1 volt on the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.

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

6. Test for greater than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.

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

7. Test for less than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and the amplifier harness connector terminal 5.

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

8. 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 Control Module References for radio replacement, setup, and programming