LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 2016 >> CTS Base, AWD >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System And Navigation System >> Diagnostic Information and Procedures >> Auxiliary Audio Input Malfunction (IO6 with CW1) >> Circuit/System Testing >> Auxiliary Audio Input Jack
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Auxiliary Audio Input Jack

  1. Ignition OFF, disconnect the X1 harness connector at the X83 Auxiliary Audio Input. Ignition ON, infotainment system ON.
  2. Test for 2.5-3.5 V between the signal circuit terminal 5 and ground.
    • If less than 2.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio.
    2. 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
    3. 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, replace the A11 Radio.
    • If greater than 3.5 V 
    1. Ignition OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON.
    2. Test for less than 1 V between the detection circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the A11 Radio.
    • If between 2.5-3.5 V 
  3. Test for less than 1 V between the signal circuits listed below and ground:
    • Left auxiliary audio signal circuit terminal 1
    • Right auxiliary audio signal circuit terminal 2
    • Auxiliary audio common signal circuit terminal 3
    • If 1 V or greater 
    1. Ignition OFF, disconnect the X2 harness connector at the K31 Navigation Control Module. 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 on the circuit.
      • If less than 1 V, replace the K31 Navigation Control Module.
    • If less than 1 V 
  4. Ignition OFF, disconnect the X1 harness connector at the A11 Radio and X2 harness connector at the K31 Navigation Control Module.
  5. Test for infinite resistance between the signal circuits listed below and ground:
    • Left auxiliary audio signal circuit terminal 1
    • Left auxiliary audio signal circuit terminal 5
    • Right auxiliary audio signal circuit terminal 7
    • Right auxiliary audio signal circuit terminal 11
    • Auxiliary audio common signal circuit terminal 8
    • Auxiliary audio common signal circuit terminal 12
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • If infinite resistance 
  6. Test for less than 5 Ω between the signal circuit terminals listed below:
    • K31 Navigation Control Module signal circuit terminal 1 X2 and the X83 Auxiliary Audio Input signal circuit terminal 1 X1
    • K31 Navigation Control Module signal circuit terminal 7 X2 and the X83 Auxiliary Audio Input signal circuit terminal 2 X1
    • K31 Navigation Control Module signal circuit terminal 8 X2 and the X83 Auxiliary Audio Input signal circuit terminal 3 X1
    • K31 Navigation Control Module signal circuit terminal 5 X2 and the A11 Radio signal circuit terminal 9 X1
    • K31 Navigation Control Module signal circuit terminal 11 X2 and the A11 Radio signal circuit terminal 10 X1
    • K31 Navigation Control Module signal circuit terminal 12 X2 and the A11 Radio signal circuit terminal 8 X1
    • If 5 Ω or greater 

      Repair the open/high resistance in the circuit.

    • If less than 5 Ω 
  7. Replace the X83 Auxiliary Audio Input. Connect all harness connectors.
  8. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X83 Auxiliary Audio Input 3.5 mm (1/8 in.) input jack and select the AUX test mode.
  9. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool 

      Replace the K31 Navigation Control Module.

  10. Connect all harness connectors.
  11. Connect the EL-50334-20 Multi-Media Interface Tester (MIT) to the X83 Auxiliary Audio Input 3.5 mm (1/8 in.) input jack and select the AUX test mode.
  12. Verify the audio from the EL-50334-20 Multi-Media Interface Tester (MIT) is heard through the infotainment system while operating the system to play audio from the test tool.
    • If audio is not heard from the test tool 

      Replace the A11 Radio.

    • If audio is heard from the test tool 
  13. All OK.
scientia non olet · About LEMON Manuals