DTC B2470
DTC B2470 |
Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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DTC Descriptor |
DTC B2470 04
Cellular Phone Antenna Circuit Open Circuit
Circuit/System Description |
The cellular phone antenna is connected to the telematics communication interface control module with a RG-58 coax cable. The telematics communication interface control module polls the data from the cellular phone antenna once every second.
Conditions for Running the DTC |
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The ignition is in the RUN or ACCESSORY position.
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System voltage is between 9.5 V and 15.5 V.
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The above conditions are present for greater than 1 second.
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Conditions for Setting the DTC |
The telematics communication interface control module does not detect the presence of a cellular phone antenna.
Action Taken When the DTC Sets |
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The vehicle is unable to connect to the OnStar® Call Center.
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The OnStar® status LED turns red.
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Conditions for Clearing the DTC |
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The telematics communication interface control module detects the presence of a cellular phone antenna.
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A history DTC will clear after 50 malfunction-free ignition cycles.
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Reference Information |
Schematic Reference
OnStar Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
OnStar Description and Operation
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification |
Verify that the T4F cellular phone antenna and T4F cellular phone antenna coupling assembly are not damaged.
Circuit/System Testing |
1. |
Ignition OFF, disconnect the antenna coax from the K73 telematics communication interface control module and the T4F cellular phone antenna.
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2. |
Ignition ON, test for less than 1 V between the antenna coax center terminal and ground.
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3. |
If greater than the specified range, replace the antenna coax.
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4. |
Ignition ON, test for less than 1 V between the antenna coax outer shield and ground.
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5. |
If greater than the specified range, replace the antenna coax.
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6. |
Test for infinite resistance between the antenna coax center terminal and ground.
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7. |
If less than the specified value, replace the antenna coax.
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8. |
Test for infinite resistance between the antenna coax outer shield and ground.
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9. |
If less than the specified value, replace the antenna coax.
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10. |
Test for less than 5 Ω at the cellular antenna coax center terminal from end to end.
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11. |
If greater than specified value, replace the antenna coax.
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12. |
Test for less than 5 Ω at the cellular antenna coax outer shield from end to end.
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13. |
If greater than specified value, replace the antenna coax.
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14. |
Test for infinite resistance between the antenna coax center terminal and the outer shield.
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15. |
If less than specified value, replace the antenna coax.
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16. |
If coax cable tests normal, replace the T4F cellular phone antenna.
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17. |
Erase the diagnostic trouble codes and run the car under the same conditions as during the diagnostic trouble code. Check that diagnostic trouble code B2470 is not set.
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18. |
If the DTC sets, replace the K73 telematics communication interface control module.
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Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Radio Antenna Base Replacement
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Control Module References
for telematics communication interface control module replacement, setup, and programming
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