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Tahoe / Yukon Service Manual

DTC B1964

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5199780 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 B1964 Universal Serial Bus USB D Serial Data For symptom byte information refer to Symptom Byte List. Diagnostic Fault Information

Circuit Circuit Function Short to Ground Open/High Resistance Short to Voltage Signal Performan
340 B+ B1964 B1964 — —
USB Cable Multimedia Data B1964 B1964 — —
2851 Ground — 1 — —
1. USB port Inoperative

Circuit/System Description The infotainment system has a auxiliary jack and USB receptacle assembly. The X23 Multimedia Receptacle 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 A11 Radio via a standard USB cable. Auxiliary Audio Input Jack (if equipped) When a portable audio playback device is connected to the 3.5 mm (1/8 in.) auxiliary audio input jack an internal switch opens the detection signal circuit . The A11 Radio detects the device and AUX becomes available as an audio source. Audio signals from the device are sent to the A11  Radio from the auxiliary input jack via the USB cable. USB Port The USB receptacle interfaces directly with the A11 Radio via a standard USB cable. A Mini type USB connector is used to connect the cable at the A11 Radio and at the X23 Multimedia Receptacle. 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 port allows 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 radio controls. Not all portable media player devices or file types are compatible. Refer to the owner’s manual for information on USB devices, control, and operation. Refer to the owner manual for information on the Navigation system. SD Card Reader (if equipped) The infotainment system uses the SD card reader for the Navigation map data. Refer to the owners manual for information on the navigation system. 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 The A11 Radio detects a general fault on the USB 5 V circuit. Action Taken When the DTC Sets The X23 Multimedia Receptacle is 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 100 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

  1. Verify DTC B1964 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 B1964 is set. Refer to Circuit/System testing. ⇓ If DTC B1964 is not set.
  2. Ignition ON, Connect a compatible USB device to the USB port and attempt to play audio from a comparable know good vehicle.
  3. Verify audio is heard through the infotainment system while operating the USB device. ⇒ If audio is not heard USB device is not compatible, try a different USB device. ⇓ If audio is heard
  4. Connect a compatible USB device to the USB port and attempt to play audio from the customers vehicle.
  5. 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 A fault is not currently present and may be an intermittent condition. Circuit/System Testing
  6. Ignition OFF, disconnect the X1 connector at the X23 Multimedia Receptacle.
  7. Test ground circuit terminal 3 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.
  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 circuit 340 for an open/high resistance. ⇒ If an open/high resistance is found, repair the fault on the circuit. ⇓ If the test lamp illuminates
  9. Verify the USB cable is properly connected at all components and any 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 X23 Multimedia Receptacle. Connect all harness connectors.
  11. Ignition ON, Connect a compatible USB device to the USB port and attempt to play audio.
  12. Verify audio is heard through the infotainment system while operating the USB device. ⇒ If audio is not heard 7.1. Replace the USB cable assembly. 7.2. Connect a compatible USB device to the USB port and attempt to play audio. 7.3. 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. 7.4. All OK. ⇓ If audio is heard
  13. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Multimedia Receptacle Replacement Control Module References control module replacement, programming, and setup.