B2462
DTC B2462
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.
DTC Descriptors
DTC B2462 01
- Global Positioning System (GPS) Short to Battery
DTC B2462 02
- Global Positioning System (GPS) Short to Ground
DTC B2462 04
- Global Positioning System (GPS) Open Circuit
Circuit Description
The navigation antenna is connected to the navigation radio. The radio supplies 5 V to the antenna to power the internal amplifier thorough the center conductor of the antenna coax cable.
When the vehicle is equipped with the optional telematics communication interface control module, 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
The navigation radio detects a short to B+ on the GPS antenna signal circuit.
B2462 02
The navigation radio detects a short to ground on the GPS antenna signal circuit.
B2462 04
The navigation radio detects an open/high resistance on the GPS antenna signal circuit.
Actions 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 Aids
* This DTC can only be retrieved from the radio. The telematics communication interface control module does not set this DTC.
* The radio cannot detect faults between the signal splitter (if equipped) and the navigation antenna. Faults between the signal splitter and the navigation antenna will result in a loss of GPS signal without setting DTC B2462.
* The navigation antenna requires a clear line of sight to the sky to operate properly. The GPS may have limited, intermittent, or no reception near tall buildings or inside structures.
Reference Information
Schematic Reference
Radio/Navigation System Schematics Radio/Navigation System Schematics
Connector End View Reference
Component Connector End Views Sunshade - Left
Description and Operation
Radio/Audio System Description and Operation Radio/Audio System
Electrical Information Reference
* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs
Scan Tool Reference
Control Module References Programming and Relearning for scan tool information
Special Tools
EL-49903 - OnStar Antenna Diagnostic Tool Kit
Circuit/System Testing
Without UE1
1. Ignition OFF, disconnect the navigation antenna coax cable connector at the A11 radio. Connect the EL-49903 - GM OnStar antenna diagnostic tool kit to the A11 radio, place the test antenna on the roof of the vehicle.
2. Ignition ON, radio ON, navigation selected.
3. Verify DTC B2462 is not set.
• If DTC B2462 is set
Replace the A11 radio.
• If DTC B2462 is not set
4. Ignition OFF, disconnect the radio navigation coax cable at the T4P navigation antenna.
5. Verify the radio navigation coax cable passes the coax cable component test. Refer to Component Testing.
• If the coax cable does not pass the test
Replace the coax cable
• If the coax cable passes the test
6. Test or replace the T4P navigation antenna.
With UE1
1. Ignition OFF, disconnect the navigation antenna coax cable connector at the A11 radio. Connect the EL-49903 - GM OnStar antenna diagnostic tool kit to the A11 radio, place the test antenna on the roof of the vehicle.
2. Ignition ON, radio ON, navigation selected.
3. Verify DTC B2462 is not set.
• If DTC B2462 is set
Replace the A11 radio.
• If DTC B2462 is not set
4. Ignition OFF, disconnect the radio navigation coax cable at the T15 navigation signal splitter.
5. Verify the radio navigation coax cable passes the coax cable component test. Refer to Component Testing.
• If the coax cable does not pass the test
Replace the coax cable
• If the coax cable passes the test
6. Test or replace the T15 navigation signal splitter.
Component Testing
Caution: Refer to Test Probe Caution 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 ohms between coax cable center terminal end to end.
• If 5 ohms or greater
Replace the coax cable
• If less than 5 ohms
3. Test for less than 5 ohms between the coax cable outer shield end to end.
• If 5 ohms or greater
Replace the coax cable
• If less than 5 ohms
4. Test for infinite resistance between the coax cable center terminal and the coax cable outer shield.
• If less than infinite resistance
Replace the coax cable
• If infinite resistance
5. All OK
Repair Instructions
Perform the Diagnostic Repair Verification Verification Tests after completing the repair.
* Navigation Signal Splitter Replacement Navigation Signal Splitter Replacement
* Radio Antenna Base Replacement Radio Antenna Base Replacement
* Control Module References Programming and Relearning for radio replacement, programming, and setup.