• 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.

For symptom byte information refer to Symptom Byte List.

The infotainment system has a USB receptacle assembly in the front of the console. The USB receptacles in the assembly interface with a hub device, internal to the assembly. The assembly receives fused battery voltage and ground from the harness to power the internal hub device as well as providing additional amperage to power USB devices.

The internal hub device interfaces directly with the radio via a standard USB cable. A mini type USB connector is used to connect the cable at the radio and at the USB receptacle assembly. USB male to female connections are typically used for connecting USB cables together where an in-line connection is required. An in-line cable connection is typically found between the console and I/P harness.

The USB ports allow connectivity to the infotainment system from portable media players or a USB storage device (memory stick/ flash drive). When a device is connected to the USB port, the system detects the device and USB becomes available as an audio source. Once connected, the device can be controlled from the infotainment controls.

Not all portable media player devices, storage devices, or file types are compatible. Refer to the owner’s manual for information on USB devices, control, and operation.

• Ignition is ON or in the ACC position
• The system voltage is 9-16 V
• The infotainment system is ON
• The test is run once per second when the infotainment system is operating

The radio detects a general failure condition on the USB 5 V circuit.

The USB ports are inoperative while the DTC is current.

• The condition for setting the DTC is no longer present.
• A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred.

This DTC may be set due to the connection of an incompatible or faulty USB device.

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

Control Module References for scan tool information

• EL-50334-20 Multi-Media Interface Tester (MIT)
• EL-50334-50 USB Cable and Adapter Kit
• EL-50334-14 Infotainment Test Cable

1. Verify DTC B124C is not set. Since occurrences of this DTC can be caused by an incompatible or faulty USB device, review with the customer the conditions under which their concern occurred.
• If DTC B124C is set.

  Refer to Circuit/System testing.

• If DTC B124C is not set.
2. Ignition ON, infotainment system ON.
3. Connect the EL-50334-20  Multi-Media Interface Tester (MIT) to the X92 USB Receptacle USB port and select the USB test mode.
4. Verify the audio from the EL-50334-20  Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
• If audio is not heard from the test tool

  Refer to Circuit/System testing

• If audio is heard from the test tool
5. All OK.

1. Ignition OFF, disconnect the X1 harness connector at the X92 USB Receptacle.
2. Test for less than 10 Ω between the ground circuit terminal 4 and ground.
• If 10 Ω or greater
1. Ignition OFF.
2. Test for less than 2 Ω in the ground circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If less than 2 Ω, repair the open/high resistance in the ground connection.
• If less than 10 Ω
3. Verify that a test lamp illuminates between the B+ circuit terminal 6 and ground.
• If the test lamp does not illuminate
1. Ignition OFF, remove the test lamp.
2. Test for less than 2 Ω in the B+ circuit end to end.
• If 2 Ω or greater, repair the open/high resistance in the circuit.
• If the test lamp illuminates
4. Verify the USB cable is properly connected at all components and in-line connections, and there is no damage to the cable or connections.
• If connection problems or cable damage is noted.

  Perform the appropriate repair or replacement to correct any issues.

• If no connection problems or cable damage is noted.
5. Connect the X1 harness connector at the X92 USB Receptacle.
6. Disconnect the vehicle USB cable harness connector at the A11 Radio and the X92 USB Receptacle.
7. Connect the EL-50034–14 Infotainment Test Cable and the EL-50334–2 Type-A Female to Mini-B Male Cable together. Connect the assembled test cable to the A11 Radio and the X92 USB Receptacle.
8. Ignition ON, infotainment system ON.
9. Connect the EL-50334-20  Multi-Media Interface Tester (MIT) to the X92 USB Receptacle USB port and select the USB test mode.
10. Verify the audio from the EL-50334-20  Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
• If audio is not heard from the test tool
1. Replace the X92 USB Receptacle. Connect all harness connectors.
2. Connect the EL-50334-20  Multi-Media Interface Tester (MIT) to the X92 USB Receptacle USB port and select the USB test mode.
3. Verify the audio from the EL-50334-20  Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
• If audio is not heard from the test tool, replace the A11 Radio.
• If audio is heard from the test tool.
4. All OK.
• If audio is heard from the test tool
11. Replace the USB cable assembly.

Perform the Diagnostic Repair Verification after completing the repair.

• Audio Player and USB Receptacle Replacement
• Control Module References for human machine interface control module replacement, programming, and setup.