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Tahoe / Yukon Service Manual

DTC B15B9

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5501096 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 B15B9 Rear Seat Infotainment Auxiliary Audio/Video Jack Low Voltage Differential Signaling LVDS Signal (+) 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
LVDS Cable Digital Video — B15B9 13 — —

Circuit/System Description The Rear Seat Infotainment system utilizes two 12.6 inch fixed 16x9 aspect ratio, touch panel LCD displays with 1920x1080 pixel resolution. P22F Rear Display – Passenger Seat Back (Display 1) located in the back of the passenger seat is a smart display. P22E Rear Display – Driver Seat Back (Display 2) located in the back of the driver’s seat is a slave display. Display 1 is connected to Display 2 via a LVDS cable. Also connected to the P22F Rear Display – Passenger Seat Back is a X83B Audio/Video Input Adaptor which houses 2 USB ports and 2 HDMI ports. Conditions for Running the DTC Ignition ON for more than 5 s The system voltage is 9-16 V The Rear Seat Infotainment system is ON Conditions for Setting the DTC B15B9 13 The P22F Video Display – Passenger Seat Back detects a fault in the Rear Seat Infotainment X83B  Audio/Video Input Adaptor LVDS Signal (+) circuit (HDMI 1). Action Taken When the DTC Sets The P22F Video Display – Passenger Seat Back sets this DTC Conditions for Clearing the DTC The P22F Video Display – Passenger Seat Back detects a properly synced digital video signal. A history DTC will clear once 40 consecutive malfunction-free ignition cycles have occurred. 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 Circuit/System Verification

  1. Ignition ON/Vehicle in Service mode, Rear Seat Infotainment system ON, verify media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor. ⇒ If media can not be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor. Refer to Circuit/System Testing. ⇓ If media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor.
  2. All OK Circuit/System Testing
  3. Ignition/vehicle OFF, disconnect the X1 connector at the X83B Audio/Video Input Adaptor.
  4. Test the ground circuit terminal 4 for an open/high resistance. ⇒ If an open/high resistance is found repair the fault in the circuit. ⇓ If an open/high resistance is not found.
  5. Ignition ON/Vehicle in Service mode, verify a test light illuminates between the B+ circuit terminal 6 and ground. ⇒ If a test light does not illuminate repair the fault in the circuit. ⇓ If the test light illuminates Replace the LVDS interface cable between the P22F Rear Display – Passenger Seat Back and the X83B Audio/Video Input Adaptor.
  6. Verify the DTC does not set or that media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor. ⇓ If the DTC does not set or media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor.
  7. All OK. ⇒ If the DTC sets or media can not be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor. Replace the X83B Audio/Video Input Adaptor.
  8. Verify the DTC does not set or that media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor. ⇓ If the DTC does not set or media can be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor.
  9. All OK. ⇒ If the DTC sets or media can not be played through the HDMI 1 port of the X83B Audio/Video Input Adaptor.
  10. Disconnect the X1 connector at the P22F Video Display – Right Front Seat Back.
  11. Test the ground circuits terminals 2 and 9 for an open/high resistance. ⇒ If an open/high resistance is found repair the fault in the circuit. ⇓ If an open/high resistance is not found.
  12. Ignition ON infotainment system ON, verify a test light illuminates between the B+ circuits terminals 1, 6, 8 and ground. ⇒ If a test light does not illuminate repair the fault in the circuit. ⇓ If the test light illuminates Replace the P22F Rear Display – Passenger Seat Back. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. For control module replacement, programming, and setup refer to: Control Module References