Digital Radio Poor or No Reception

Digital Radio Poor or No Reception

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) 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)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

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, reconnect the antenna coax to the Radio, disconnect the digital radio antenna coax from the digital radio antenna.
4. Ignition ON, test for 4.5-5.5V between the antenna coax center terminal and the coax outer shield.

• If not within the specified range, replace the antenna coax.

5. If all circuits test normal, replace the digital radio antenna.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

* Cellular and Navigation Antenna Assembly Replacement (Service and Repair)
* Control Module References (Programming and Relearning) for radio replacement, setup, and programming