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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1346 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Speaker Malfunction >> Circuit/System Testing >> Speaker Malfunction Amplifier Output Testing (-Y91)
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Speaker Malfunction Amplifier Output Testing (-Y91)

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  1. Ignition OFF, disconnect the X1 and X2 connectors at the audio amplifier.
  2. Radio ON, test for less than 1 volt between the appropriate signal circuit terminal listed below and ground:
    • Left front speaker output (+) - terminal 4 X2
    • Left front speaker output (-) - terminal 3 X2
    • Right front speaker output (+) - terminal 2 X2
    • Right front low speaker output (-) - terminal 1 X2
    • Left rear speaker output (+) - terminal 8 X2
    • Left rear speaker output (-) - terminal 7 X2
    • Right rear speaker output (+) - terminal 6 X2
    • Right rear speaker output (-) - terminal 5 X2
    • Left subwoofer speaker output (+) - terminal 7 X1
    • Left subwoofer speaker output (-) - terminal 3 X1
    • Right subwoofer speaker output (+) - terminal 6 X1
    • Right subwoofer speaker output (-) - terminal 2 X1
    • If greater than the specified range, test both circuits of the affected speaker for a short to voltage.
  3. Radio OFF, test for infinite resistance between the appropriate signal circuit terminal listed below and ground:
    • Left front speaker output (+) - terminal 4 X2
    • Left front speaker output (-) - terminal 3 X2
    • Right front speaker output (+) - terminal 2 X2
    • Right front low speaker output (-) - terminal 1 X2
    • Left rear speaker output (+) - terminal 8 X2
    • Left rear speaker output (-) - terminal 7 X2
    • Right rear speaker output (+) - terminal 6 X2
    • Right rear speaker output (-) - terminal 5 X2
    • Left subwoofer speaker output (+) - terminal 7 X1
    • Left subwoofer speaker output (-) - terminal 3 X1
    • Right subwoofer speaker output (+) - terminal 6 X1
    • Right subwoofer speaker output (-) - terminal 2 X1
    • If less than the specified value, test both circuits of the affected speaker for a short to ground.
  4. If all circuits test normal, reconnect all harness connectors at the audio amplifier.
  5. Radio ON, disconnect the appropriate speaker.
  6. Test for 5.0-7.5 volts between the signal circuit terminals and ground.
    • If less then the specified range test the circuit for an open/high resistance. If the circuit tests normal, replace the audio amplifier.
    • If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the audio amplifier.
  7. If the circuit tests normal, replace the appropriate speaker.
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