DTC B2483 or B2484. Chevrolet Silverado

For 1990-2009 cars only

Makes 🢒 Chevrolet 🢒 2008 🢒 Silverado - 4WD 🢒 DTC 🢒 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

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.

•	Mobile Telephone Digital Antenna Replacement

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