2010 Cadillac Truck Escalade EXT AWD V8-6.2L Page 624
* The navigation radio tests the GPS antenna every 10 seconds
Conditions for Setting the DTC
B2462 02
The navigation radio detects a short to ground in the GPS antenna signal circuit.
B2462 04
The navigation radio detects 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 (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
Scan Tool Reference
Control Module References (See: Testing and Inspection/Programming and Relearning) 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.
1. Ignition OFF, disconnect the GPS antenna coax cable from the navigation radio.
2. Ignition ON, test for 4.5-5.5 volts between the coax cable connection center conductor at the radio and ground.
瀚慖f not within the specified range, replace the radio.
3. If all circuits test normal, replace the GPS antenna.
Repair Instructions
Perform the Diagnostic Repair Verification (See: Verification Tests) after completing the diagnostic procedure.
* Electronic Navigation Antenna Replacement (See: Accessories and Optional Equipment/Antenna/Antenna Mast/Service and Repair)
* Control Module References (See: Testing and Inspection/Programming and Relearning) for radio replacement, setup, and programming
