Service Information

Orlando

No Global Positioning System (GPS) Reception

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 Description

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

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.

Control Module References for Radio replacement, setup, and programming