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. |
| • | Battery voltage is between 9-16 volts. |
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
Entertainment/Communication Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
Circuit/System Testing
- Disconnect the navigation antenna coax cable from the CIM.
- Ignition ON, test for 4.5-5.5 volts between the CIM coax cable connection center conductor and ground.
| ⇒ | If the reading is 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 volts between the coax cable center conductor and the outer shield.
| ⇒ | If the reading is 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.
