Diagnostic Instructions
DTC Descriptors
DTC B2462: Global Positioning System (GPS) Signal Error
Circuit Description
The global positioning system (GPS) antenna is connected to the navigation radio by a shielded coaxial cable. The GPS antenna is powered through the same coaxial cable used to send signals to the navigation system. The antenna cable also provides a path
for DC current for powering the GPS antenna.
Conditions for Running the DTC
| • | Battery voltage between 9-16 volts |
| • | The navigation radio tests the GPS antenna every 10 seconds |
Conditions for Setting the DTC
The DTC will set when the navigation radio detects a short to ground or an open/high resistance in the GPS 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
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
Important: 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.
- Disconnect the GPS antenna coax cable from the navigation radio.
- Ignition ON, test for 4.5-5.5 volts between the radio coax cable connection center conductor and ground.
| ⇒ | If the reading is not within the specified range, replace the radio. |
- If all circuits test normal, replace the GPS antenna.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
