B2483

DTC B2483 or B2484

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* 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

Circuit/System Description

The navigation radio receives information from a specific navigation antenna located on the outside of the vehicle. The navigation antenna is connected to the vehicle communication interface module (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 radio is ON.
* Battery voltage must be between 9-16 volts.

Conditions for Setting the DTC

The DTC will set when the VCIM detects a short or an open/high resistance on the navigation antenna signal circuit.

Action Taken When the DTC Sets

* The OnStar(R) status LED turns red.
* The OnStar(R) 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.

Circuit/System Testing

1. Ignition OFF, disconnect the navigation antenna coaxial cable from the VCIM and the navigation antenna.
2. Test for less than 5 ohms between the two ends of the coax cable center conductor.

• If greater than the specified range, replace the antenna coax cable.

3. Test for less than 5 ohms between the two ends of the coax cable outer shield.

• If greater than the specified range, replace the antenna coax able.

4. Test for infinite resistance between the antenna coax center conductor and the outer shield.

• If less than the specified range, replace the antenna coax cable.

5. If all circuits test normal, replace the navigation antenna.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

* Cellular Communications/Digital Radio Antenna Replacement