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Home >> Cadillac >> 2017 >> ATS Base, 4D Sedan, RWD, Automatic Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 174 (Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Eject Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2016 Cadillac CT6. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF and all vehicle systems OFF, disconnect the harness connector at the S140 Media Disc Eject Switch. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 10 Ω between the ground circuit terminal 4 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 
  3. Verify a test lamp illuminates between the B+ circuit terminal 1 and ground.
    • If the test lamp does not illuminate 

      Repair the open/high resistance in the circuit.

    • If the test lamp illuminates 
  4. Ignition ON.
  5. Verify a test lamp does not illuminate between the control circuit terminal 3 and ground.
    • If the test lamp illuminates 
    1. Ignition OFF, disconnect the X1 harness connector at the A33 Media Disc Player. Ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage the circuit.
      • If less than 1 V, replace the A33 Media Disc Player.
    • If the test lamp does not illuminate 
  6. Test for 10 V or greater between the control circuit terminal 3 and ground.
    • If less than 10 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 10 V or greater. 
  7. Replace the S140 Media Disc Eject Switch. Connect all harness connectors.
  8. Ignition ON, infotainment system ON. Insert a disc in the A33 Media Disc Player.
  9. Verify the disc ejects after touching the eject switch.
    • If the disc does not eject 

      Replace the A33 Media Disc Player.

    • If the disc ejects 
  10. All OK.
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