PRE-RELEASE
DTC B125C
| DTC B125C |
| 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 Descriptors |
DTC B125C 01
Satellite Antenna 1 Circuit Short to Battery
DTC B125C 02
Satellite Antenna 1 Circuit Short to Ground
DTC B125C 04
Satellite Antenna 1 Circuit Open Circuit
| Circuit/System Description |
The digital radio receiver, located inside the radio, receives digital radio information from the digital radio antenna located on the outside of the vehicle. The digital radio receiver is connected to the digital radio antenna via a shielded coax cable.
| Conditions for Running the DTC |
This DTC is run every 300 milliseconds.
| Conditions for Setting the DTC |
The radio detects a circuit fault in the digital radio antenna.
| Action Taken When the DTC Sets |
The radio displays No XM Signal or Check Antenna.
| Conditions for Clearing the DTC |
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A current DTC clears when the condition for setting the DTC is no longer present.
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A history DTC will be cleared after 100 malfunction-free ignition cycles.
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| 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
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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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Special Tools
EL-48028 Digital Radio Test Antenna
| Circuit System Verification |
With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM. Verify XM reception is clear and the No XM Signal message is not displayed on the radio.
| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the digital radio antenna coax cable from the A11 radio. Connect the EL-48028 to the radio and place on the roof of the vehicle.
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| 2. |
Ignition ON, radio tuned to XM channel 1. Verify DTC B125C is not set as current and XM reception is improved.
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| 3. |
If DTC B125C is set as current or the reception is not improved, replace the radio.
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| 4. |
Ignition OFF, reconnect the antenna coax cable at the A11 radio. Disconnect the antenna coax cable from the T4G antenna.
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| 5. |
Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and an outer shield.
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| 6. |
If less than the specified range, test the antenna coax cable for an open/high resistance.
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| 7. |
If greater than the specified range, test the antenna coax cable for a short to voltage.
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| 8. |
If all circuits test normal, replace the T4G antenna.
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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 radio replacement, setup, and programming
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