Buick Regal: DTC B2462 (IO5/IO6 with UE1)
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.
- Refer to Diagnostic Procedure Instructions for an overview of each
diagnostic category.
DTC Descriptors
DTC B2462 02
Global Positioning System Short to Ground
DTC B2462 04
Global Positioning System Open
Circuit/System Description
The navigation antenna is connected to the Telematics Communication Interface
Control Module. The
module supplies 5 V to the antenna to power the internal amplifier through the
center conductor of the
antenna coax cable.
When the vehicle is equipped with the optional navigation system, a Navigation
Antenna Signal Splitter
is installed to distribute the navigation signal to both the Telematics
Communication Interface Control
Module and the Human Machine Interface Control Module. The Human Machine
Interface Control
Module supplies 5 V through the coax cable to power the Navigation Antenna
Signal Splitter.
Conditions for Running the DTC
- Radio On.
- System voltage is greater than 9 V and less than 16 V.
- The navigation system/telematics communication interface control module
tests the GPS antenna
every 10 s.
Conditions for Setting the DTC
B2462 02
The Telematics Communication Interface Control Module or Human Machine
Interface Control Module
detects a short to ground on the GPS antenna signal circuit.
B2462 04
The Telematics Communication Interface Control Module or Human Machine
Interface Control Module
detects a open/high resistance on the GPS antenna signal circuit.
Action Taken When the DTC Sets
- The Telematics Communication Interface Control Module or Human Machine
Interface Control
Module 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
- The scan tool Telematics Communication Interface Control Module GPS
signal parameter will
display a Yes or No dependent upon whether or not the module sees an
increment of the seconds
transmitted by GPS signals to the Telematics Communication Interface Control
Module. Upon
entering this screen, the GPS signal title will initially display Yes,
regardless of the presence of
time increment, for at least 2 seconds, while the algorithm in the scan tool
determines the status of
the clock. If increment is found, Yes is continually displayed. If the clock
remains static, No is
displayed. The scan tool looks for increment every second, regardless of
current display.
- Inaccurate or aged GPS position concerns which are no longer present may
have been due to the
temporary loss of GPS signal reception by the vehicle. Conditions such as
tunnels or parking structures will restrict the cellular phone and
navigation antenna from a clear view of the satellites
in the sky and may have caused this temporary data loss.
- The GPS requires a clear line of sight to the sky to operate properly.
In most cases the GPS will
not have reception near tall buildings or inside structures.
Reference Information
Schematic Reference
- Refer to OnStar/Telematics Wiring Schematics
- Refer to Radio/Navigation System Wiring Schematics (IOB) ,
Radio/Navigation System
Wiring Schematics (IOR) or Radio/Navigation System Wiring Schematics
(IO5/IO6) , or
Radio/Navigation System Wiring Schematics (IOS/IOT)
Connector End View Reference
Component Connector End View Index
Description and Operation
- Refer to OnStar Description and Operation (UE1 with IOB/IO6) , OnStar
Description and
Operation (UI3) , or OnStar Description and Operation (UE1 without IOB/IO6)
- Refer to Radio/Audio System Description and Operation (IO6) ,
Radio/Audio System Description and Operation (IOB) , or Radio/Audio System
Description and Operation (IOS/IOT/IOU).
Electrical Information Reference
- Refer to Circuit Testing
- Refer to Connector Repairs
- Refer to Testing for Intermittent Conditions and Poor Connections
- Refer to Wiring Repairs
Scan Tool Reference
Control Module References for scan tool information.
Special Tools
EL-49903 OnStar Antenna Diagnostic Tool Kit
Circuit/System Verification
NOTE: The following verification requires the vehicle to be outside
with an
unobstructed view of the southern sky. Allow 5 minutes after turning the
ignition ON for the vehicle to acquire the GPS satellites signal.
1. Ignition ON/vehicle in Service Mode.
2. Verify that DTC B2462 is not set in the Telematics Communication Interface
Control Module.
- If DTC B2462 is set in the Telematics Communication Interface Control
Module and
the vehicle is not equipped with a navigation system
Refer to Circuit/System Testing Without Navigation System.
- If DTC B2462 is set in the Telematics Communication Interface Control
Module and
the vehicle is equipped with a navigation system
Refer to Circuit/System Testing With Navigation System.
- Go to next step: If DTC B2462 is not set in the Telematics
Communication Interface
Control Module
3. Verify an OnStar advisor can locate the vehicle after performing a blue
button press.
- If the advisor can not locate the vehicle and the vehicle is not
equipped with a
navigation system
Refer to Circuit/System Testing Without Navigation System
- If the advisor can not locate the vehicle and the vehicle is equipped
with a navigation
system
Refer to Circuit/System Testing With Navigation System.
- Go to next step: If the advisor can locate the vehicle
4. Verify DTC B2462 is not set in the Human Machine Interface Control Module.
- If DTC B2462 is set in the Human Machine Interface Control Module
Refer to Step 9 of Circuit/System Testing With Navigation System.
- Go to next step: If DTC B2462 is not set in the Human Machine
Interface Control
Module
5. Verify that the NO GPS symbol/message is not displayed on the radio
display.
- If the NO GPS symbol/message is displayed
Refer to Step 9 of Circuit/System Testing With Navigation System.
- Go to next step: If the NO GPS symbol/message is not displayed
6. All OK.
Circuit/System Testing
Without Navigation System
NOTE: You must perform the Circuit/System Verification before
proceeding
with Circuit/System Testing.
1. Ignition OFF/vehicle OFF, disconnect the GPS and cellular coax cable
connector at the K73
Telematics Communication Interface Control Module.
2. Attach both leads of the EL-49903 - 1 OnStar test antenna to the EL-49903 - 5
combiner. Using
the EL-49903 - 6 coax cable attach the grey connector to the combiner and the
brown connector to
the K73 Telematics Communication Interface Control Module. Place the test
antenna on the roof
of the vehicle, ignition ON.
3. Verify DTC B2462 is not set or that the OnStar advisor can locate the
vehicle.
- If DTC B2462 is set or the advisor can not locate the vehicle
Replace the K73 Telematics Communication Interface Control Module.
- Go to next step: If DTC B2462 is not set or the advisor can locate
the vehicle
4. Test the coax cable between the K73 Telematics Communication Interface
Control Module and
the T2RR Antenna - Roof Rear. Refer to Component Testing.
- If the coax cable does not pass the test
Replace the coax cable.
- Go to next step: If the coax cable passes the test
5. Test or replace the T2RR Antenna - Roof Rear.
With Navigation System
NOTE: You must perform the Circuit/System Verification before
proceeding
with Circuit/System Testing.
1. Ignition OFF/vehicle OFF, disconnect the T2RR Antenna - Roof Rear coax
cable at the T15
Navigation Antenna Signal Splitter.
2. Attach both leads of the EL-49903 - 1 OnStar test antenna to the EL-49903 - 5
combiner. Using
the EL-49903 - 7 coax cable attach one grey connector to the combiner and the
other grey
connector to the T15 Navigation Antenna Signal Splitter. Place the test antenna
on the roof of the
vehicle, ignition ON.
3. Verify DTC B2462 is not set or that the OnStar advisor can locate the
vehicle.
- If DTC B2462 is not set or the advisor can locate the vehicle
- Test the coax cable between the T15 Navigation Antenna Signal Splitter
and the T2RR
Antenna - Roof Rear. Refer to Component Testing.
- If the coax cable does not pass the test
Replace the coax cable.
- Go to next step: If the coax cable passes the test
- Replace the T2RR Antenna - Roof Rear.
- Go to next step: If DTC B2462 is set or if the advisor can not locate
the vehicle
4. Ignition OFF/vehicle OFF, disconnect the GPS and cellular coax cable
connector at the K73
Telematics Communication Interface Control Module.
5. Attach both leads of the EL-49903 - 1 OnStar test antenna to the EL-49903 - 5
combiner. Using
the EL-49903 - 6 coax cable attach the grey connector to the combiner and the
brown connector to
the K73 Telematics Communication Interface Control Module. Place the test
antenna on the roof
of the vehicle, ignition ON.
6. Verify DTC B2462 is not set or that the OnStar advisor can locate the
vehicle.
- If DTC B2462 is set or the advisor can not locate the vehicle.
Replace the K73 Telematics Communication Interface Control Module.
- Go to next step: If DTC B2462 is not set or the advisor can locate
the vehicle.
7. Ignition OFF/vehicle OFF.
8. Test the coax cable between the T15 Navigation Antenna Signal Splitter and
the K73 Telematics
Communication Interface Control Module. Refer to Component Testing.
- If the coax cable does not pass the test.
Replace the coax cable.
- Go to next step: If the coax cable passes the test.
9. Ignition OFF/vehicle OFF, disconnect the blue GPS coax cable connector at
the K74 Human
Machine Interface Control Module.
10. Attach the EL-49903 - 1 OnStar test antenna blue connector to the K74 Human
Machine Interface
Control Module and place the test antenna on the roof of the vehicle.
11. Ignition ON/vehicle in Service Mode.
12. Verify DTC B2462 is not set or that the NO GPS symbol/message is not
displayed on the radio.
- If DTC B2462 is set or the NO GPS symbol/message is displayed
Replace the K74 Human Machine Interface Control Module.
- Go to next step: If DTC B2462 is not set or if the NO GPS
symbol/message is not
displayed.
13. Ignition OFF/vehicle OFF.
14. Test the coax cable between the T15 Navigation Antenna Signal Splitter and
the K74 Human
Machine Interface Control Module. Refer to Component Testing.
- If the coax cable does not pass the test.
Replace the coax cable.
- Go to next step: If the coax cable passes the test.
15. Test or replace the T15 Navigation Antenna Signal Splitter.
Component Testing
CAUTION: 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.
- The vehicle may be equipped with sectioned coax. Test each section
and replace only the faulty section, not the entire length of coax.
Coax Cable Test
1. Ignition OFF/vehicle OFF, disconnect the coax cable at both components.
2. Test for less than 5 Ω between the coax cable center terminal end to end.
Replace the coax cable.
- Go to next step: If less than 5 Ω
3. Test for greater than 5 Ω between the coax cable outer shield end to end.
Replace the coax cable.
- Go to next step: If less than 5 Ω
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.
- Go to next step: If infinite resistance
5. All OK.
Repair Instructions
Perform the Diagnostic Repair Verification after completing the repair.
- Refer to High Frequency Antenna Replacement
- Refer to Control Module References for Human Machine Interface control
module or Telematics
Communication Interface Control Module replacement, programming, and setup.
READ NEXT:
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.
Refe
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.
Refe
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.
Refe
SEE MORE:
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 Descriptor
DT
Preliminary Procedure
Front Seat Cushion Outer Finish Cover Replacement (Manual) or Front Seat
Cushion Outer
Finish Cover Replacement (Power).
Front Seat Recliner Knob
Front Seat Adjuster Knob
Driver or Passenger Seat Adjuster Switch
Procedure
Disconnect the electrical connector.
FRONT SE