Diagnostic Instructions
DTC Descriptors
DTC B2483 00: Global Positioning System (GPS) Antenna Malfunction Short to Ground
DTC B2484 00: 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. |
| • | System voltage is between 9.5 volts and 15.5 volts. |
| • | The above conditions are present for greater than 1 second. |
Conditions for Setting the DTC
B2483 00
The CIM detects a short to ground on the navigation antenna signal circuit.
B2484 00
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.
