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Amplifier Circuit Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
  2. Test for less than 10 ohms between the ground circuit terminal 5 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. 3.Test for B+ between the battery voltage circuit terminal 8 and ground.
    • If less than the specified value, test the circuit for a short to ground or an open/high resistance.
  4. Ignition OFF, disconnect the X3 harness connector at the audio amplifier.
  5. Radio ON, test for B+ between the signal circuit terminal 8 and ground.
    • If less than the specified value, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  6. 6.Test for 0.6-1.0 V between the amplifier mute circuit terminal 16 and ground.
    • If less than the specified range, test the mute circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
    • If greater than the specified range, test the mute circuit for a short to voltage. If the circuit tests normal, replace the radio.
  7. If all circuits test normal, replace the audio amplifier.
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