2010 Cadillac Truck SRX AWD V6-3.0L Page 212
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
* A current DTC clears when the condition for setting the DTC is no longer present.
* A history DTC clears after 100 malfunction-free ignition cycles.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (See: Accessories and Optional Equipment/Diagrams/Electrical Diagrams/Radio/Navigation System
Schematics)
Connector End View Reference
Component Connector End Views (See: Diagrams/Connector Views/Connector End Views By Name)
Description and Operation
Radio/Audio System Description and Operation (See: Accessories and Optional Equipment/Description and Operation/Radio/Audio System)
Electrical Information Reference
* Circuit Testing (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Circuit
Testing/Circuit Testing)
* Connector Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic
Procedures/Connector Repairs/Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (See: Testing and Inspection/Component Tests and General Diagnostics/General
Electrical Diagnostic Procedures/Circuit Testing/Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (See: Testing and Inspection/Component Tests and General Diagnostics/General Electrical Diagnostic Procedures/Wiring
Repairs/Wiring Repairs)
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 radio. Connect the EL-48028 to the radio and place on the roof of the
vehicle.
2. Ignition ON, radio tuned to XM channel 1. Verify DTC B125C is not set as current and XM reception is improved.
瀚慖f DTC B125C is set as current or the reception is not improved, replace the radio.
3. Ignition OFF, reconnect the antenna coax cable at the radio. Disconnect the antenna coax cable from the digital radio antenna.
4. Ignition ON, radio ON, test for 4.5-5.5 V between the antenna coax cable center terminal and an outer shield.
瀚慖f less than the specified range, test the antenna coax cable for an open/high resistance.
瀚慖f greater than the specified range, test the antenna coax cable for a short to voltage.
5. If all circuits test normal, replace the digital radio antenna.
