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Home >> Chevrolet >> 2014 >> Impala Limited LT >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing

Circuit/System Testing

Speaker Circuit Malfunction - without Amplifier

  1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
  2. Radio ON, test for 5.0-7.5 V between each signal circuit terminal A and 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.
  3. If all circuits test normal, replace the speaker.

Amplifier Circuit Malfunction

  1. Ignition OFF, disconnect the X3 harness connector at the amplifier.
  2. Test for less than 10 Ω of resistance between the ground circuit terminal 8 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  3. Test for B+ between the battery voltage circuit terminal 4 and ground.
    • If less than the specified value, test the circuit for a short to ground or an open/high resistance.
  4. Disconnect the X1 harness connector at the 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. If all circuits test normal, replace the amplifier.

Speaker Circuit Malfunction - with Amplifier

  1. Ignition OFF, disconnect the X1 connector at the 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 15 X1
    • Left front low level audio signal (-) - terminal 7 X1
    • Right front low level audio signal (+) - terminal 14 X1
    • Right front low level audio signal (-) - terminal 6 X1
    • Left rear low level audio signal (+) - terminal 13 X1
    • Left rear low level audio signal (-) - terminal 5 X1
    • Right rear low level audio signal (+) - terminal 12 X1
    • Right rear low level audio signal (-) - terminal 4 X1
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio.
    • 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.
  3. Ignition OFF, disconnect the X2 and X3 harness connectors at the amplifier.
  4. Ignition ON, test for less than 1 V between each of the signal circuit terminals listed below and ground.
    • Left front speaker output (-) - terminal 3 X2
    • Left front speaker output (+) - terminal 4 X2
    • Right front speaker output (-) - terminal 1 X2
    • Right front speaker output (-) - terminal 2 X2
    • Left rear speaker output (-) - terminal 7 X2
    • Left rear speaker output (+) - terminal 8 X2
    • Right rear speaker output (-) - terminal 5 X2
    • Right rear speaker output (-) - terminal 6 X2
    • Left subwoofer speaker output (-) - terminal 3 X3
    • Left subwoofer speaker output (+) - terminal 7 X3
    • Right subwoofer speaker output (-) - terminal 2 X3
    • Right subwoofer speaker output (+) - terminal 6 X3
    • If greater than the specified range, test both signal circuits of the affected speaker for a short to voltage.
  5. Ignition OFF, test for infinite resistance between each of the signal circuit terminals listed below and ground.
    • Left front speaker output (-) - terminal 3 X2
    • Left front speaker output (+) - terminal 4 X2
    • Right front speaker output (-) - terminal 1 X2
    • Right front speaker output (+) - terminal 2 X2
    • Left rear speaker output (-) - terminal 7 X2
    • Left rear speaker output (+) - terminal 8 X2
    • Right rear speaker output (-) - terminal 5 X2
    • Right rear speaker output (+) - terminal 6 X2
    • Left subwoofer speaker output (-) - terminal 3 X3
    • Left subwoofer speaker output (+) - terminal 7 X3
    • Right subwoofer speaker output (-) - terminal 2 X3
    • Right subwoofer speaker output (+) - terminal 6 X3
    • If less than the specified range, test both signal circuits of the affected speaker for a short to ground.
  6. Ignition OFF, reconnect all harness connectors at the amplifier. Disconnect the harness connector at the appropriate speaker.
  7. 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 A pillar speakers - terminal A and B
    • Rear tweeters - terminal A and B
    • Rear subwoofers - terminal 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.
  8. If all circuits test normal, replace the speaker.
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