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.

### DTC Descriptors

DTC B2462 01: Global Positioning System Signal Short to Battery
DTC B2462 02: Global Positioning System Signal Short to Ground
DTC B2462 04: Global Positioning System Signal Open

### Circuit Description

The global positioning system antenna is connected to the navigation radio by a coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

### Conditions for Running the DTC

• | Radio ON

• | Battery voltage between 9-16 volts

• | The navigation radio tests the global positioning system antenna every 10 seconds

### Conditions for Setting the DTC

#### B2462 01

The navigation radio detects a short to voltage in the global positioning system antenna signal circuit.

#### B2462 02

The navigation radio detects a short to ground in the global positioning system antenna signal circuit.

#### B2462 04

The navigation radio detects an open/high resistance in the global positioning system antenna signal circuit.

### Actions Taken When the DTC Sets

• | The radio uses the last reported position and the vehicle speed signal to calculate the vehicle position.

• | Route guidance may be inaccurate.

• | Turn by turn navigation may be inaccurate or inoperative.

### Conditions for Clearing the DTC

• | The condition responsible for setting the DTC no longer exists.

• | A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

### Reference Information

#### Schematic Reference

Radio/Navigation System Schematics

#### Connector End View Reference

Component Connector End Views

#### Description and Operation

Navigation System Description and Operation

#### Electrical Information Reference

• | Circuit Testing

• | Connector Repairs

• | Testing for Intermittent Conditions and Poor Connections

• | Wiring Repairs

#### Scan Tool Reference

Control Module References for scan tool information.

### Circuit/System Testing

Note: The global positioning system (global positioning system) requires a clear line of sight to the sky to operate properly. In most cases the global positioning system will not have reception near tall buildings or inside structures.

1. Ignition OFF, disconnect the T4E global positioning system antenna coax cable from the A11 radio.
2. Ignition ON, test for 4.5-5.5 volts between the radio coax cable connection center conductor and ground.

⇒ | If not within the specified range, replace the A11 radio.

3. If all circuits test normal, replace the T4E global positioning system antenna.

### Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

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