DTC B2462 Navigation Radio
Diagnostic Instructions
DTC Descriptors
DTC B2462 02: Global Positioning System (GPS) Short to Ground
DTC B2462 04: Global Positioning System (GPS) Open Circuit
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 must be between 9-16 volts. |
Conditions for Setting the DTC
B2462 02
The DTC will set when the navigation radio detects a short to ground in the GPS antenna signal circuit.
B2462 04
The DTC will set when the navigation radio detects an open/high resistance in the GPS antenna signal circuit.
Actions Taken When the DTC Sets
| • | Unable to get GPS location updated, the radio uses the last reported position and the vehicle speed signal to calculate the vehicle position. |
| • | Route guidance may be inaccurate. |
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
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
- Ignition OFF, disconnect the GPS antenna coax cable from the navigation radio.
- Ignition ON, test for 4.5-5.5 volts between the coax cable connection center conductor at the radio and ground.
| ⇒ | If 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.
DTC B2462 Communication Interface Module
Diagnostic Instructions
DTC Descriptors
DTC B2462 02: Global Positioning System (GPS) Antenna Malfunction Short to Ground
DTC B2462 04: Global Positioning System (GPS) Antenna Malfunction Open Circuit
Circuit/System Description
The communication interface module (CIM) receives information from a specific navigation antenna located on the outside of the vehicle. The navigation antenna is connected to the CIM via a shielded coaxial cable. The antenna cable also provides a path
for DC current for powering the antenna.
Conditions for Running the DTC
| • | Ignition is in the RUN or ACC position. |
| • | Battery voltage is between 9-16 volts. |
Conditions for Setting the DTC
B2462 02
The CIM detects a short to ground on the navigation antenna signal circuit.
B2462 04
The CIM detects an open/high resistance on the navigation antenna signal circuit.
Action Taken When the DTC Sets
| • | The OnStar® status LED turns red. |
| • | The OnStar® Call Center cannot locate the vehicle. |
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
OnStar Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Testing
- Disconnect the navigation antenna coax cable from the CIM.
- Ignition ON, test for 4.5-5.5 V between the CIM coax cable center conductor terminal at the module and ground.
| ⇒ | If not within the specified range, replace the CIM. |
- Reconnect the coax cable to the CIM. Disconnect the coax cable from the navigation antenna.
- Test for 4.5-5.5 V between the coax cable center conductor and the outer shield.
| ⇒ | If not within the specified range, replace the coax cable. |
- If all circuits test normal, replace the navigation antenna.
Repair Instructions
Perform the
Diagnostic Repair Verification after completing the diagnostic procedure.
