• Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
• Review Strategy Based Diagnosis for an overview of the diagnostic approach.
• Diagnostic Procedure Instructions provides an overview of each diagnostic category.

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. The digital radio antenna contains an amplifier which is powered by the radio through the coax cable.

This DTC is run every 300 milliseconds.

The radio detects a circuit fault in the digital radio antenna.

The radio displays No XM Signal or Check Antenna.

• 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.

The digital radio antenna requires a clear line of sight to the sky to operate properly. Reception may be limited, intermittent, or unavailable inside structures.

Radio/Navigation System Schematics

Master Electrical Component List

Radio/Audio System Description and Operation

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

EL-52552 COAX FAKRA Cable Adaptor Kit

1. With the vehicle outside in an area with an unobstructed view of the southern sky, tune to XM.
2. Verify DTC B125C is not set as current and the No XM Signal message is not displayed on the radio.
• If DTC B125C is set as current or the No XM Signal message is displayed.

  Refer to Circuit/System Testing.

• If the customer complaint indicates certain XM channels are missing or certain XM channels have no audio

  Refer to Missing XM Channels or No Audio On Certain XM Channels

• If DTC B125C is not set as current and the No XM Signal message is not displayed and all expected channels are present and functioning correctly.
3. All OK.

1. Ignition OFF, disconnect the XM antenna coax cable from the A11 Radio and from the T2RR Antenna – Roof Rear.
2. Verify the antenna coax cable passes the coax cable component test. Refer to Component Testing.
• If the coax cable does not pass the test

  Replace the antenna coax cable

• If the coax cable passes the test
3. Connect the XM antenna coax cable to the A11 Radio.
4. Connect the appropriate pinout adaptor from EL-52552 COAX FAKRA Cable Adaptor Kit to the coax cable at the T2RR Antenna – Roof Rear.
5. Ignition ON, A11 Radio ON.
6. Test for 4–6 V between the terminals at the pinout adaptor.
• If less than 4 V
1. Test the coax cable for a short to ground
• If a short to ground is found, repair the fault on the circuit.
• If a short to ground is not found
2. Test the coax cable for an open/high resistance.
• If an open/high resistance is found, repair the fault on the circuit.
• If an open/high resistance is not found.
3. Replace the A11 Radio.
• If greater than 6 V
1. Test the coax cable for a short to voltage.
• If a short to voltage is found, repair the fault on the circuit.
• If a short to voltage is not found.
2. Replace the A11 Radio
• If between 4–6 V
7. Test or replace the T2RR Antenna – Roof Rear.

1. Locate vehicle with a clear view of the southern and western sky while channel 1 is playing audio.
2. Record the XM Radio ID from channel 0. If there is no channel 0, the XM Radio ID can be found by tuning to the XM band then under System Settings select Manage.
3. Call XM at US: www.xmradio.com or 1-800-556-3600 prompt 2 or Canada: 1-877-438-9677 and verify the customer’s account is properly setup for the customer and has active XM service for the vehicle. Note: For concerns with missing channels, it is necessary to verify channel status with XM (some channels may be moved or deleted by XM and some are package specific or are listed as Online listening only).
4. Perform an Ignition/RAP Power cycle
5. Verify that “no audio” or "missing channels" condition still exists (Review all channels and documenting those channels that are missing or have no audio).
6. Call XM again and request the XM advisor to deactivate the service. From there, verify that the deactivation was received by the receiver by verifying they only have Channels 0 and 1 available. This process could take 5+ minutes.
7. Perform an Ignition/RAP Power cycle (Should still see only channel 0 and channel 1 present after this power cycle).
8. Call XM and Activate the receiver with the SiriusXM programming package appropriate for the capability of the audio system.
9. The activation can take up to 30 minutes to complete. Do not attempt to change from channel 1 until the XM advisor says it is ok to change channels. (Note: A slight mute in the audio may be heard on some models during the activation).
10. Once other channels appear, wait a few more minutes for all channels to load properly, then turn the radio off.
11. Perform an Ignition/RAP Power cycle
12. Check activation status (Proceeded with checking ALL available channels for no audio condition).
13. Power cycle vehicle.
14. Recheck activation status (Checked all previously suspect channels written down earlier in step 4).

Note: If the concern is still present after following the previous steps. It may be necessary to perform a 24hr deactivation and then reactivate to resolve.

1. Ignition OFF, disconnect the coax cable at both components.
2. Locate the appropriate pinout adaptor and load test loop adaptor from EL-52552 COAX FAKRA Cable Adaptor Kit.
3. Connect the 2 adaptors together, test and record the resistance between the terminals at the pinout adaptor.
4. Disconnect the 2 adaptors and connect each one to the appropriate end of the coax cable.
5. Measure the total resistance of the coax cable loop including all connected adaptors at the pinout adaptor.
• If greater than 5 Ω plus or minus the reading from step 3.

  Replace the coax cable

• If less than 5 Ω plus or minus the reading from step 3.
6. All OK.

Perform the Diagnostic Repair Verification after completing the repair.

• High Frequency Antenna Replacement
• Control Module References for radio replacement, programming, and setup.