Navigation System - Voice Guidance Malfunction

Navigation System - Voice Guidance Manfunction

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 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 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. 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 (Programming and Relearning) for radio replacement, setup, and programming