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Tahoe / Yukon Service Manual

DTC B1965

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5504206 Diagnostic Instructions 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. DTC Descriptor DTC B1965 00 Universal Serial Bus USB D (+) Serial Data 2 For symptom byte information refer to Symptom Byte List. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
B+ B1965, 1, 3 B1965, 1, 2 — —
USB Cable B1965 B1965 B1965 —
Ground — 1 — —
1. USB ports Inoperative 2. Fault may affect one or more components, dependant on fault location 3. Fault affects multiple components, dependant on vehicle equipment

Circuit/System Description 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. Conditions for Running the DTC 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 Conditions for Setting the DTC B1965 00 The radio detects a general failure condition on the USB 5 V circuit. Action Taken When the DTC Sets The USB ports are inoperative while the DTC is current. Conditions for Clearing the DTC The condition for setting the DTC is no longer present. A history DTC will clear once 50 consecutive malfunction-free ignition cycles have occurred. Diagnostic Aids This DTC may be set due to the connection of an incompatible or faulty USB device. Reference Information Schematic Reference Radio/Navigation System Schematics Connector End View Reference Master Electrical Component List Description and Operation Radio/Audio System Description and Operation Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References for scan tool information Special Tools EL-50334-50 USB Cable and Adapter Kit EL-50334-14 Infotainment Test Cable Circuit/System Verification

  1. Verify DTC B1965 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 B1965 is set. Refer to Circuit/System testing. ⇓ If DTC B1965 is not set.
  2. Ignition ON, infotainment system ON.
  3. Connect a compatible USB device to the X92 Auxiliary Audio Input USB port and attempt to play audio.
  4. Verify audio is heard through the infotainment system while operating the USB device. ⇒ If audio is not heard Refer to Circuit/System testing ⇓ If audio is heard
  5. All OK. Circuit/System Testing
  6. Ignition OFF, disconnect the X1 harness connector at the X92 USB Receptacle.
  7. Test for less than 10 Ω between the ground circuit terminal 3 and ground. ⇒ If 10 Ω or greater 2.1. Ignition OFF. 2.2. 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
  8. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground. ⇒ If the test lamp does not illuminate 3.1. Ignition OFF, remove the test lamp. 3.2. 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
  9. 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.
  10. Replace the X92 USB Receptacle. Connect all harness connectors.
  11. Ignition ON, infotainment system ON.
  12. Connect a compatible USB device to the X92 Receptacle USB port inside the center console and attempt to play audio.
  13. Verify audio is heard through the infotainment system while operating the USB device. ⇒ If audio is not heard 8.1. Replace the USB cable assembly between the X92 USB receptacle and the A11 Radio. Connect all harness connectors. 8.2. Connect a compatible USB device to the X92 Receptacle USB port inside the center console and attempt to play audio.. 8.3. Verify audio is heard through the infotainment system while operating the USB device. ⇒ If audio is not heard, replace the A11 Radio. ⇓ If audio is heard from. 8.4. All OK. ⇓ If audio is heard
  14. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for human machine interface control module replacement, programming, and setup.