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Tahoe / Yukon Service Manual

DTC B1A62 (UVB (in Radio))

Diagnostic Instructions Perform the Diagnostic System Check prior to using this diagnostic procedure: Diagnostic System Check - Vehicle Review the description of Strategy Based Diagnosis: Strategy Based Diagnosis An overview of each diagnostic category can be found here: Diagnostic Procedure Instructions DTC Descriptor DTC B1A62 Rearview Driver Information Camera Symptom Byte Information: Symptom Byte List Diagnostic Fault Information

Circuit Short to Ground Open/High Resistance Short to Voltage Signal Performanc
Coax- B87 Rearview Driver Information Camera to A11 Radio) 1 1 1 B1A62 4A,82, 86
1. Rearview Camera = Malfunction

Circuit/System Description When the transmission is placed into REVERSE, a signal is sent to the Info Display Module indicating that camera operation is requested. The rearview camera sends video information to the Radio through a coax cable. The coax cable also provides power from the Radio to the rearview camera. The Radio then sends the video information to the Info Display Module through another coax cable. Conditions for Running the DTC Engine Running Transmission in Reverse Conditions for Setting the DTC DTC B1A62 4A The A11 Radio detects that the wrong camera is installed. DTC B1A62 82 The A11 Radio detects that the camera message sequence counter from the camera is incorrect or not updated. DTC B1A62 86 The A11 Radio detects that the camera signal message from the camera is invalid or video signal circuit (coax) is faulty. Actions Taken When the DTC Sets Actions Taken When the DTC Sets Service Rear Vision Camera message = On Conditions for Clearing the DTC The conditions for setting the DTC no longer exist. Reference Information Schematic Reference Image Display Camera Schematics Connector End View Reference Master Electrical Component List Electrical Information Reference Circuit Testing Connector Repairs Testing for Intermittent Conditions and Poor Connections Wiring Repairs Scan Tool Reference Control Module References Special Tools EL-52552 COAX FAKRA CABLE ADAPTER KIT Equivalent regional tools: Special Tools Circuit/System Verification

  1. Verify no other Infotainment system related DTCs are present. ⇒ If any other DTCs are set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle. ⇓ If no other DTCs are set
  2. Verify DTC B1594 is not set in A11 Radio. ⇒ If DTC B1594 is set Refer to: Diagnostic Trouble Code (DTC) List - Vehicle. ⇓ If DTC B1594 is not set
  3. Perform the following visual inspections: Misalignment of the components: B87 Rearview Driver Information Camera Visible Damage Dirty ⇒ If a condition exists » Repair or replace as necessary ⇓ If none of the conditions exists
  4. Refer to: Circuit/System Testing Circuit/System Testing Circuit/System Testing DTC B1A62 4A
  5. Ignition/Vehicle & All vehicle systems » Off
  6. Replace the component: B87 Rearview Driver Information Camera
  7. Apply the parking brake.
  8. Engine Running Transmission in Reverse
  9. Verify the DTC does not set. ⇒ If the DTC is not set All OK. ⇓ If the DTC sets
  10. Replace the A11 Radio Circuit/System Testing DTC B1A62 82, 86
  11. Ignition/Vehicle & All vehicle systems » Off
  12. Disconnect the electrical connector: X5 @ A11 Radio
  13. Wait for greater than 5 s.
  14. Connect appropriate EL-52552 pinout tool to A11 Radio
  15. Ignition » On / Vehicle » In Service Mode
  16. Test for 7 to 11 V between the test points: Signal circuit terminal OG @ A11 Radio & Ground (component side) ⇒ If not between 7 and 11 V Replace the component: A11 Radio ⇓ If between 7 and 11 V
  17. Ignition/Vehicle & All vehicle systems » Off
  18. Disconnect the electrical connector: B87 Rearview Camera
  19. Locate the appropriate pinout adapter and load test loop adapter from EL-52552 COAX FAKRA Cable Adaptor Kit.
  20. Connect the 2 adapters together, measure and record the resistance between the terminals at the pinout adapter.
  21. Disconnect the 2 adapters and connect each one to the appropriate end of the coax cable.
  22. At the pinout adapter test terminals, measure the total resistance of the coax cable loop including the connected load test adapter. ⇒ If not within 5 Ω of the reading from step 10. Replace the coax cable ⇓ If within 5 Ω of the reading from step 10.
  23. Replace the component: B87 Rearview Camera
  24. Apply the parking brake.
  25. Engine Running Transmission in Reverse
  26. Verify the DTC does not set. ⇒ If the DTC is set Replace the component: A11 Radio ⇓ If the DTC is not set
  27. All OK. Repair Instructions Perform the Diagnostic Repair Verification after completing the repair: Diagnostic Repair Verification For control module replacement, programming, and setup refer to: Control Module References