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Home >> Cadillac >> 2017 >> CT6 Plug-In >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> DTC B1288: Left/Right Video Display Mode Control Signal >> Circuit/System Testing

Circuit/System Testing

  1. Ignition OFF.
  2. Disconnect the X1 harness connector at the appropriate P22 Video Display.
  3. Test for less than 10 Ω between the ground circuit terminal 3 and ground.
    • If 10 Ω or greater. 
    1. Ignition OFF.
    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. 
  4. Verify that a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF, remove the test lamp.
    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 less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF, remove the test lamp.
    2. Test for infinite resistance between the B+ circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the P22 Video Display
    • If the test lamp illuminates 
  5. Ignition On/Vehicle in Service Mode. Rear seat entertainment system ON.
  6. Test for 5 V or greater between the control circuit terminal 2 and ground.
    • If less than 5 V. 
    1. Ignition OFF, disconnect the X1 harness connector at the A33 Media Disc Player.
    2. Test for infinite resistance between the control circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the control circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the A33 Media Disc Player.
    • If 5 V or greater. 
  7. Ignition OFF.
  8. Verify the LVDS cable is properly connected at the P22 Video Display, A33 Media Disc Player and all in-line connectors 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. 
  9. Test or replace the appropriate P22 Video Display
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