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Home >> Buick >> 2018 >> Regal Base >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Infotainment >> Cellular System, Entertainment System, And Navigation System - Diagnostic Information And Procedures >> Diagnostic Information and Procedures >> Auxiliary Audio Input Malfunction (IOB) >> Circuit/System Testing >> Auxiliary Audio Input Jack

Auxiliary Audio Input Jack

  1. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the X83 Auxiliary Audio Input. Ignition ON/vehicle in Service Mode, radio 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/vehicle 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.
      • Go to next step: 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/vehicle OFF, disconnect the X1 harness connector at the A11 Radio, ignition ON/vehicle in Service Mode.
    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.
    • Go to next step: 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/vehicle OFF, disconnect the X1 harness connector at the A11 Radio. Ignition ON/vehicle in Service Mode.
    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 A11 Radio.
    • Go to next step: If less than 1 V 
  4. Ignition OFF/vehicle OFF, disconnect the X1 harness connector at the A11 Radio.
  5. Test for infinite resistance between the signal circuits listed below and ground:
    • Auxiliary audio common signal circuit terminal 18
    • Left auxiliary audio signal circuit terminal 19
    • Right auxiliary audio signal circuit terminal 20
    • If less than infinite resistance 

      Repair the short to ground on the circuit.

    • Go to next step: If infinite resistance 
  6. Test for less than 5 Ω between the signal circuit terminals listed below:
    • A11 Radio terminal 19 X1 and the X83 Auxiliary Audio Input terminal 1 X1
    • A11 Radio terminal 20 X1 and the X83 Auxiliary Audio Input terminal 2 X1
    • A11 Radio terminal 18 X1 and the X83 Auxiliary Audio Input terminal 3 X1
    • If 5 Ω greater 

      Repair the open/high resistance in the circuit.

    • Go to next step: If less than 5 Ω 
  7. Replace the X83 Auxiliary Audio Input. Connect all harness connectors.
  8. Connect and operate the EL-50334-20  Multi-Media Interface Tester (MIT).
  9. Verify the audio from the test tool is heard through the vehicle infotainment system.
    • If audio is not heard from the test tool 

      Replace the A11 Radio.

    • Go to next step: If audio is heard from the test tool 
  10. All OK.
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