DTC B2483 or B2484. Cadillac STS 2007

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 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: GPS Sensor Circuit Low

DTC B2484 00: GPS Sensor Circuit Open

Tthe vehicle communication interface module (VCIM) receives GPS information from a specific navigation antenna located on the outside of the vehicle. The navigation antenna is connected to the VCIM via a shielded coaxial cable. The antenna cable also provides a path for DC current for powering the antenna.

Conditions for Running the DTC

•	The ignition must be in the RUN or ACC position.

•	The system voltage is at least 9.5 volts and no more than 15.5 volts.

•	All the above conditions are present for greater than 1 second.

Conditions for Setting the DTC

B2483

The VCIM detects a short to ground on the navigation antenna signal circuit.

B2484

The VCIM 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 clears after 50 malfunction-free ignition cycles.

Reference Information

Electrical Information Reference

•	Circuit Testing

•	Connector Repairs

•	Testing for Intermittent Conditions and Poor Connections

•	Wiring Repairs

Disconnect the navigation antenna coax connector from the VCIM.
Ignition ON, test for 4.5-5.5 V between the VCIM coax cable center conductor terminal at the module and ground.

⇒	If not within the specified range, replace the VCIM.

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.

•	Cellular Communications/Digital Radio Antenna Replacement

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