For 1990-2009 cars

### Diagnostic Instructions

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

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

• | Diagnostic Procedure Instructions provides 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 on the same circuits as the normal audio signals.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Entertainment/Communication Connector End Views

#### Description and Operation

Radio/Audio System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Scan Tool Data List

### Circuit/System Verification

1. Ignition ON, verify the radio is operating normally.

⇒ | If the radio audio is distorted or inoperative, refer to Speakers Inoperative - One or More.

2. Drive the vehicle and activate the Navigation System by choosing a navigation route.
3. Verify the voice guidance is operating properly.

⇒ | If the voice guidance is not operating properly, replace the radio.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for Radio replacement, setup, and programming