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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

The navigation aerial is connected to the navigation radio. The radio supplies 5 V to the aerial to power the internal amplifier thorough the centre conductor of the aerial coax cable.

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 aerial every 10 seconds.

Conditions for Setting the DTC

B2462 01

The radio detects a short to B+ on the GPS aerial signal circuit.

B2462 02

The radio detects a short to ground on the GPS aerial signal circuit.

B2462 04

The radio detects an open/high resistance on the GPS aerial 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.

Reference Information

Schematic Reference

Radio/Navigation System Schematics

Connector End View Reference

Component Connector End Views

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 OnStar Aerial Diagnostic Tool Kit

Circuit/System Testing

Without UE1

  1. Ignition OFF, disconnect the navigation aerial coax cable from the A11 radio.
  2. Connect the EL-49903 to the A11 radio, place the test aerial 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.
  4. Ignition OFF, reconnect the navigation aerial coax cable at the A11 radio.
  5. Disconnect the aerial coax cable from the T4G navigation aerial.
  6. Ignition ON, test for 4.5-5.5 V between the coax cable centre conductor and the outer shield.
    7. ⇒If not within the specified range, test or replace the coax cable.
  7. If all circuits test normal, replace the T4G navigation aerial.

Component Testing

Caution: Refer to Test Probe Caution in the Preface section.

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 centre 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 centre terminals.
    3. ⇒If greater than the specified range, replace the coax cable
  3. Test for less than 5 Ω between both ends of the coax cable outer shield.
    4. ⇒If greater than the specified range, replace the coax cable
  4. Test for infinite resistance between the coax cable centre wire and the outer coax shield.
    5. ⇒If less than the specified range, replace the coax cable.

Repair Instructions
    •  Radio Aerial Base Replacement
    • Control Module References for radio replacement, setup, and programming.
   


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