Digital Radio Poor or No Reception
Digital Radio Poor or No Reception
Diagnostic Instructions
* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview)provides an overview of each diagnostic category.
Diagnostic Fault Information
Circuit/System Description
The XM satellite radio is integrated into the radio. The radio receives an XM satellite radio signal via the digital radio antenna. This signal is passed to the DRR through the digital radio antenna coax. The antenna cable also provides a path for D.C. current for powering the antenna.
Reference Information
Schematic Reference
Radio/Navigation System Schematics (Radio/Navigation System Schematics)
Connector End View Reference
Component Connector End Views (Connector Views)
Description and Operation
Radio/Audio System Description and Operation (Radio/Audio System Description and Operation)
Electrical Information Reference
* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)
Scan Tool Reference
Control Module References (Programming and Relearning)for scan tool information
Special Tools
EL-48028 Digital Radio Test Antenna
Circuit/System Verification
1. Tune to a strong AM or FM station and verify each speaker is producing clear and even sound, with no distortion.
• If any speaker is not producing sound or the sound produced is distorted, refer to Speaker Malfunction (Speaker Malfunction).
2. 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 from the radio. Connect the EL-48028 to the radio and move the vehicle outside in an area with an unobstructed view of the southern sky.
2. Ignition ON, radio tuned to XM, verify XM reception is clear and uninterrupted.
• If reception is not clear, replace the radio.
3. Ignition OFF, disconnect the digital radio antenna coax from the radio and from the digital radio antenna.
4. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
• If greater than the specified range, replace the antenna coax.
5. Test for infinite resistance between the antenna coax center terminal and ground.
• If less than the specified value, replace the antenna coax.
6. Test for less than 5 ohms on the antenna coax center circuit from end to end.
• If greater than the specified range, replace the antenna coax.
7. Test for infinite resistance between the coax center terminal and the outer shield.
• If less than the specified value, replace the antenna coax.
8. If all circuits test normal, replace the digital radio antenna.
Repair Instructions
Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.
* Digital Radio and Mobile Telephone and Vehicle Location Base Replacement (Digital Radio and Mobile Telephone and Vehicle Location Base Replacement)
* Control Module References (Programming and Relearning)for radio replacement, setup, and programming