DTC B2483 or B2484. HUMMER H2 2007

For 1990-2009 cars only

Makes 🢒 HUMMER 🢒 2007 🢒 H2 🢒 Driver Information and Entertainment 🢒 Cellular, Entertainment, and Navigation 🢒 DTC B2483 or B2484

Diagnostic Instructions

•	Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

•	Review Strategy Based Diagnosis for an overview of the diagnostic approach.

•	Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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

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

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

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.

•	Cellular and Navigation Antenna Assembly Replacement

•	Control Module References for CIM replacement, setup, and programming