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Home >> Chevrolet >> 2009 >> Impala SS >> Repair and Diagnosis >> External Pages >> Different car >> Section 1623 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2012 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.

Speaker Circuit Malfunction - without Amplifier

  1. Disconnect the harness connector at the appropriate speaker.
  2. Radio ON, test for 5.0-7.5 V between the signal circuit terminal A and ground.
    • If less than the specified range, test the signal 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 signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Test for 5.0-7.5 V between the signal circuit terminal B and ground.
    • If less than the specified range, test the signal 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 signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  4. If all circuits test normal, replace the speaker.

Amplifier Circuit Malfunction

  1. Ignition OFF, disconnect the X1 harness connector at the audio amplifier.
  2. Ignition OFF, test for less than 10 Ω between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Ignition ON, test for B+ between the B+ circuit terminal 4 and ground.
    • If less than the specified value, test the B+ circuit for a short to ground or an open/high resistance.
  4. Radio ON, test for B+ between the antenna 12 V switched supply voltage signal circuit terminal 3 and ground.
    • If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the radio.
  5. Test for 0.6-1.0 V between the amplifier mute signal circuit terminal 7 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.
    • If greater than the specified value, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  6. If all circuits test normal, replace the audio amplifier.

Speaker Circuit Malfunction - with Amplifier

  1. Disconnect the X3 harness connector at the audio amplifier.
  2. Radio ON, test for 5.0-7.5 V between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) terminal 1
    • Left front low level audio signal (-) terminal 9
    • Right front low level audio signal (+) terminal 2
    • Right front low level audio signal (-) terminal 10
    • Left rear low level audio signal (+) terminal 3
    • Left rear low level audio signal (-) terminal 11
    • Right rear low level audio signal (+) terminal 4
    • Right rear low level audio signal (-) terminal 12
    • If less than the specified range, test the appropriate signal 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 appropriate signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
  3. Ignition OFF, connect the X3 harness connector at the audio amplifier.
  4. Disconnect the X2 harness connector at the audio amplifier.
  5. Ignition ON, test for less than 1 V between each of the signal circuit terminals listed below and ground.
    • Left Front Speaker Output(+) - terminal 2
    • Left Front Speaker Output (-) - terminal 10
    • Right Front Speaker Output(+) - terminal 6
    • Right Front Speaker Output (-) - terminal 14
    • Left Rear Speaker Output (+) - terminal 3
    • Left Rear Speaker Output (-) - terminal 11
    • Right Rear Speaker Output (+) - terminal 7
    • Right Rear Speaker Output (-) - terminal 15
    • Left subwoofer output (+) - terminal 4
    • Left subwoofer output (-) - terminal 12
    • Right subwoofer output (+) - terminal 8
    • Right subwoofer output (-) - terminal 16
    • If greater than the specified range, test both signal circuits of the affected speaker for a short to voltage.
  6. Ignition OFF, test for infinite resistance between each of the signal circuit terminals listed below and ground.
    • Left Front Speaker Output(+) - terminal 2
    • Left Front Speaker Output (-) - terminal 10
    • Right Front Speaker Output(+) - terminal 6
    • Right Front Speaker Output (-) - terminal 14
    • Left Rear Speaker Output (+) - terminal 3
    • Left Rear Speaker Output (-) - terminal 11
    • Right Rear Speaker Output (+) - terminal 7
    • Right Rear Speaker Output (-) - terminal 15
    • Left subwoofer output (+) - terminal 4
    • Left subwoofer output (-) - terminal 12
    • Right subwoofer output (+) - terminal 8
    • Right subwoofer output (-) - terminal 16
    • If less than the specified value, test both signal circuits of the affected speaker for a short to ground.
  7. Ignition OFF, reconnect all harness connectors at the amplifier. Disconnect the harness connector at the appropriate speaker.
  8. Radio ON, test for 5.0-7.5 V between the appropriate signal circuit terminals listed below and ground.
    • Front door speakers - terminal A and B
    • Front tweeters - terminal A and B
    • Rear speakers - terminal A and B
    • Subwoofers - terminals A, B, C and D
    • If less than the specified range, test the signal circuit for an open/high resistance. If the circuit tests normal, replace the amplifier.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
  9. If all circuits test normal, replace the speaker.
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