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Tahoe / Yukon Service Manual

DTC B187F

Cellular, Entertainment, and Navigation | Diagnostic Information and Procedures | Document ID: 5898867 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 B187F Entertainment Remote Enable Signal For symptom byte information refer to Symptom Byte List. Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Remote Enable DTC B187F 11, 1 DTC B1265 13, 1 — —
1. all components requiring remote enable inoperative

Circuit/System Description When the radio is on, a discrete 12 V signal is supplied on the entertainment remote enable circuit to the Rear Seat Infotainment displays. This signal is used to control the power state of the components. Conditions for Running the DTC The radio is ON. The system voltage is 9 –16 V Conditions for Setting the DTC The radio detects an open or short to ground on the entertainment remote enable circuit. The above condition is present for greater than 250 mS. Action Taken When the DTC Sets The radio implements a current limiting mode and disables the output on the entertainment remote enable circuit . All components connected on the entertainment remote enable circuit will be inoperative. Conditions for Clearing the DTC The condition for setting the DTC no longer exists. After the ignition has been OFF for a sufficient amount of time to allow the radio to enter a low power/sleep state, the radio will re-enable the output on the following ignition cycle and the DTC will become history. A history DTC clears after 50 malfunction-free ignition cycles. Diagnostic Aids This DTC may be stored as a history DTC without affecting the operation of the radio/infotainment systems. The radio’s current limiting logic may not re-enable the output on the entertainment remote enable circuit until after the radio performs a full power–down. It may be necessary to wait 5 minutes between each test attempt with the key OFF and retained accessory power OFF. 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 Testing

  1. Ignition OFF, radio OFF. It may take up to 2 min for all vehicle systems to power down.
  2. Disconnect the X1 harness connector at the P22E Video Display-Left Front Seat Back and the P22F Video Display-Right Front Seat Back and X2 harness connector at the A11 Radio.
  3. Test for infinite resistance between the signal circuit 7066 and ground. ⇒ If less than infinite resistance, repair the short to ground on the circuit. ⇓ If infinite resistance
  4. Test for less than 2 Ω in the signal circuit end to end. ⇒ If 2 Ω or greater, repair the open/high resistance in the circuit. ⇓ If less than 2 Ω
  5. Replace the A11 Radio. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair. Control Module References for radio and active noise cancellation module replacement, programming, and setup