Service Information

Orlando

DTC B2462 - Navigation Radio

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 B2462 01: Global Positioning System (GPS) Signal Short to Battery

DTC B2462 02: Global Positioning System (GPS) Signal Short to Ground

DTC B2462 04: Global Positioning System (GPS) Signal Open

Circuit Description

The global positioning system (GPS) aerial is connected to the navigation radio by a shielded coaxial cable. The GPS aerial is powered through the same coaxial cable used to send signals to the navigation system.

Conditions for Running the DTC

•

Radio ON.

•	Battery voltage between 9-16 V.

•	The navigation radio tests the GPS aerial every 10 seconds.

Conditions for Setting the DTC

B2462 01

The navigation radio detects a short to voltage in the GPS aerial signal circuit.

B2462 02

The navigation radio detects a short to ground in the GPS aerial signal circuit.

B2462 04

The navigation radio detects an open/high resistance in the GPS aerial 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.

Diagnostic Aids

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

Reference Information

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

Ignition OFF, disconnect the navigation aerial coax cable from the A11 radio.
Ignition ON, test for 4.5-5.5 V between the coax cable connection centre conductor at the A11 radio and ground.

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

Ignition OFF, reconnect the navigation aerial coax cable at the A11 radio.
Disconnect the antenna coax cable from the T4P navigation antenna.
Ignition ON, test for 4.5-5.5 V between the coax cable centre conductor and the outer shield.

⇒	If not within the specified range, replace the coax cable.

If all circuits test normal, replace the T4P navigation antenna.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

•	Radio Aerial Base Replacement

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