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DTC B2462

DTC B2462

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 B2462 01

Global Positioning System Short to Battery

DTC B2462 02

Global Positioning System Short to Ground

DTC B2462 04

Global Positioning System Open

Circuit/System Description

Navigation antenna is connected to the telematic module for the communication interface and to the radio via the navigation's centre conductor. The centre conductor sends the navigation signal to both the telematic control module communications interface and navigation radio. The telematic module supplies 5 V to the antenna to power the internal amplifier thorough the centre conductor of the antenna coax cable.

When the vehicle is equipped with the optional navigation radio, a navigation signal splitter is installed to distribute the navigation signal to both the telematics communication interface control module and the navigation radio. The telematics communication interface control module supplies 5 V through the coax cable to power the internal antenna amplifier through the signal splitter.

Conditions for Running the DTC


• Radio ON.

• System voltage is greater than 9 V and less than 16 V.

• The navigation radio tests the GPS antenna every 10 seconds.


Conditions for Setting the DTC

B2462 01

Navigation radio registers a short circuit to B+ on the GPS antenna's signal circuit.

B2462 02

Navigation radio registers a short circuit to ground on the GPS antenna's signal circuit.

B2462 04

Navigation radio registers an open circuit/high resistance on the GPS antenna's signal circuit.

Action Taken When the DTC Sets


• The radio uses the last reported position and the vehicle speed signal to calculate the vehicle position.

• Route guidance may be inaccurate.

• Turn by turn navigation may be inaccurate or inoperative.


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.


Diagnostic help


• This DTC can only be obtained from the radio. Telematic module for the communication interface does not generate this DTC.

• The radio only monitors the connection between the navigation signal's centre conductor and the radio. The radio cannot detect faults between the centre conductor and the navigation antenna. A similar fault results in a lost GPS signal without setting DTC B2462.

• The navigation antenna needs unrestricted view of the sky to function correctly. The GPS reception is limited/disappears indoors and near high buildings.


Reference Information

Schematic Reference


• OnStar Schematics

• Radio/Navigation System Schematics


Connector End View Reference

Component Connector End Views

Description and Operation


• OnStar Description and Operation

• Radio/Audio System Description and Operation


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

Special Tools

EL-49903 GM OnStar Antenna Diagnostic Tool Kit

Circuit/System Testing


With Navigation Radio

1. Ignition OFF, disconnect the navigation antenna coax cable connector at the A11 radio.

2. Connect the EL-49903 to the A11 radio, place the test antenna on the roof of the vehicle.

3. Ignition ON, verify DTC B2462 is not set in the A11 radio.

4. If DTC B2462 is set as current, replace the A11 radio.

5. Switch ignition OFF and reconnect the navigation antenna coaxial cable's connections to A11 radio.

6. Disconnect the A11 navigation radio's coax cable at T15 navigation signal splitter.

7. Ignition ON, test for 4.5-5.5 V between the coax cable center conductor and the outer shield.

8. If not within the specified range, test or replace the coax cable.

9. If all circuits test normal, replace T15 navigation signal splitter.


Component Testing

Refer to Test Probe Caution .

Note

Before testing the coax cable, check the cable exterior for being pinched, cut, damaged, or having loose connections at the components, which can cause reception issues.

To prevent false reading when testing the center coax terminals, use care not to ground the test probe on the outer housing/shield.



Coax Cable Test

1. Ignition OFF, disconnect the coax cable at both components.

2. Test for less than 5 Ω between both ends of the coax cables center terminals.

3. If greater than the specified range, replace the coax cable

4. Test for less than 5 Ω between both ends of the coax cable outer shield.

5. If greater than the specified range, replace the coax cable

6. Test for infinite resistance between the coax cable center wire and the outer coax shield.

7. If less than the specified range, replace the coax cable.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.


• Navigation Signal Splitter Replacement

• Radio Antenna Base Replacement

• Control Module References for radio replacement, setup, and programming.