LEMON Manuals: Even more car manuals for everyone
Home >> Cadillac >> 2021 >> CT4 Sport, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 15 (Cellular, Entertainment, And Navigation - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Speaker Malfunction (UQG) >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2022 Cadillac CT4. However, it is still accessible from the selected car via links, so may be relevant.

One Speaker

    NOTE:

    More than one speaker may be connected to each signal circuit in a parallel configuration. Make sure to disconnect all speakers on the signal circuit.

  1. Ignition OFF, disconnect the harness connector at the appropriate P19 Speaker.
  2. Ignition On/Vehicle in Service Mode. Infotainment system ON, mute OFF.
  3. Test for 5 - 7 V between each audio signal circuit terminal 1 and terminal 2 and ground.
    • If less than 5 V 
    1. Ignition OFF, disconnect the X1 and X2 harness connectors at the T3 Audio Amplifier.
    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 T3 Audio Amplifier.
    • If greater than 7 V 
    1. Ignition OFF, disconnect the X1 and X2 harness connectors at the T3 Audio Amplifier. 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 T3 Audio Amplifier.
    • Go to next step: If 5 - 7 V 
  4. Ignition OFF, disconnect the appropriate harness connector at the T3 Audio Amplifier.
  5. Ignition ON, A11 Radio ON, mute OFF. Test for 5 - 7 V between each appropriate audio signal circuit from the A11 Radio and Ground.
    • If less than 5 V 
    1. Ignition OFF, Disconnect the appropriate speaker harness connector at the A11 Radio.
    2. Test for infinite resistance between the signal circuits 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 7 V 
    1. Ignition OFF, disconnect the appropriate speaker harness connector at the A11 Radio. 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 A11 Radio.
    • Go to next step: If between 5 - 7 V 
  6. Test or replace the P19 Speaker.

All Speakers

  1. Ignition OFF, disconnect the X1 harness connector at the T3 Audio Amplifier.
  2. Test for less than 10 Ω between the ground circuit terminal 8 and ground.
    • If 10 Ω or greater 
    1. 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.
    • Go to next step: If less than 10 Ω 
  3. Verify that a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate 
    1. 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.
    • Go to next step: If the test lamp illuminates 
  4. Disconnect the X2 harness connector at the T3 Audio Amplifier.
  5. Ignition ON, A11 Radio ON.
  6. Verify that a test lamp illuminates between the control circuit terminal 6 and ground.
    • If the test lamp does not illuminate 
    1. Ignition OFF, disconnect the X2 harness connector at the A11 Radio.
    2. Test for infinite resistance between the control 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 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 A11 Radio.
    • Go to next step: If the test lamp illuminates 
  7. Test for 5 - 7 V between any audio signal circuit from the A11 Radio and Ground.
    • If not between 5 - 7 V 

      Test or replace the A11 Radio.

    • Go to next step: If between 5 - 7 V 
  8. Test or replace the T3 Audio Amplifier.
scientia non olet · About LEMON Manuals