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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1819 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1025-B1095 >> Circuit/System Testing
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Circuit/System Testing

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IMPORTANT:

This DTC can be set by either the radio or the amplifier. If the DTC was set by the radio, diagnose the appropriate audio output circuits to the speakers or the low level inputs to the amplifier (if equipped). If the DTC was set by the amplifier, diagnose audio output signals to the speakers from the amplifier. If equipped with rear seat audio (RSA) (U42), the RSA must be turned off to perform proper speaker testing.

Without Amplifier

  1. Ignition OFF, disconnect the harness connector at the appropriate speaker.
  2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal A and ground.
    • 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. Test for 5.0-7.5 volts between the signal circuit terminal B and ground.
    • 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.
  4. If all circuits test normal, replace the speaker.

DTC Set By The Radio UQA

  1. Ignition OFF, disconnect the X3 harness connector at the amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 15
    • Left front low level audio signal (-) - terminal 7
    • Right front low level audio signal (+) - terminal 14
    • Right front low level audio signal (-) - terminal 6
    • Left rear low level audio signal (+) - terminal 13
    • Left rear low level audio signal (-) - terminal 5
    • Right rear low level audio signal (+) - terminal 12
    • Right rear low level audio signal (-) - terminal 4
    • 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 amplifier.

DTC Set By Radio UQA with U42

  1. Ignition OFF, disconnect the X3 harness connector at the amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 15
    • Left front low level audio signal (-) - terminal 7
    • Right front low level audio signal (+) - terminal 14
    • Right front low level audio signal (-) - terminal 6
    • 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. Ignition OFF, reconnect the X3 harness connector at the amplifier.
  4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.
  5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left rear low level audio signal (+) - terminal 1
    • Left rear low level audio signal (-) - terminal 2
    • Right rear low level audio signal (+) - terminal 3
    • Right rear low level audio signal (-) - terminal 4
    • 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 rear seat audio (RSA) module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA) module.
  6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.
  7. Disconnect the X3 harness connector at the amplifier.
  8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left rear low level audio signal (+) - terminal 13
    • Left rear low level audio signal (-) - terminal 5
    • Right rear low level audio signal (+) - terminal 12
    • Right rear low level audio signal (-) - terminal 4
    • 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 rear seat audio (RSA) module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA) module.
  9. If all circuits test normal, replace the amplifier.

DTC Set By Radio UQA with Y91 and U42 or UQS and U42

  1. Ignition OFF, disconnect the X3 and X4 harness connectors at the amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 11 X3
    • Left front low level audio signal (-) - terminal 12 X3
    • Right front low level audio signal (+) - terminal 3 X3
    • Right front low level audio signal (-) - terminal 4 X3
    • Left rear low level audio signal (+) - terminal 11 X4
    • Left rear low level audio signal (-) - terminal 12 X4
    • Right rear low level audio signal (+) - terminal 3 X4
    • Right rear low level audio signal (-) - terminal 4 X4
    • Subwoofer low level audio signal (+) - terminal 5 X4
    • Subwoofer low level audio signal (-) - terminal 6 X4
    • Center Channel low level audio signal (+) - terminal 13 X4
    • Center Channel low level audio signal (-) - terminal 14 X4
    • 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 amplifier.

DTC Set By Radio UQA with Y91 and U42 or UQS and U42

  1. Ignition OFF, disconnect the X3 and X4 harness connector at the amplifier.
  2. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left front low level audio signal (+) - terminal 11 X3
    • Left front low level audio signal (-) - terminal 12 X3
    • Right front low level audio signal (+) - terminal 3 X3
    • Right front low level audio signal (-) - terminal 4 X3
    • Subwoofer low level audio signal (+) - terminal 5 X4
    • Subwoofer low level audio signal (-) - terminal 6 X4
    • Center Channel low level audio signal (+) - terminal 13 X4
    • Center Channel low level audio signal (-) - terminal 14 X4
    • 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. Ignition OFF, reconnect the X3 harness connector at the amplifier.
  4. Disconnect the X2 harness connector at the rear seat audio (RSA) module.
  5. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left rear low level audio signal (+) - terminal 1
    • Left rear low level audio signal (-) - terminal 2
    • Right rear low level audio signal (+) - terminal 3
    • Right rear low level audio signal (-) - terminal 4
    • 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 rear seat audio (RSA) module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA) module.
  6. Ignition OFF, reconnect the X2 harness connector at the rear seat audio (RSA) module.
  7. Disconnect the X2 harness connector at the amplifier.
  8. Radio ON, test for 5.0-7.5 volts between the appropriate signal circuit terminal listed below and ground.
    • Left rear low level audio signal (+) - terminal 15
    • Left rear low level audio signal (-) - terminal 14
    • Right rear low level audio signal (+) - terminal 16
    • Right rear low level audio signal (-) - terminal 8
    • 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 rear seat audio (RSA) module.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the rear seat audio (RSA) module.
  9. If all circuits test normal, replace the amplifier.

DTC Set by Audio Amplifier UQA

  1. Ignition OFF, disconnect the X1 and X2 connectors at the 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 or rear subwoofer speaker output (+) - terminal 7 X1
    • Left or rear 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 or rear subwoofer speaker output (+) - terminal 7 X1
    • Left or rear 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 amplifier.
  5. Ignition ON, 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 amplifier.
    • If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
  7. If the circuit tests normal, replace the appropriate speaker.

DTC Set by Audio Amplifier UQA with Y91 or UQS

  1. Ignition OFF, disconnect the X1 and X2 connectors at the 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 5 X2
    • Right front speaker output (+) - terminal 7 X2
    • Right front speaker output (-) - terminal 6 X2
    • Left rear speaker output (+) - terminal 15 X2
    • Left rear speaker output (-) - terminal 14 X2
    • Right rear speaker output (+) - terminal 16 X2
    • Right rear speaker output (-) - terminal 8 X2
    • Front center speaker output (+) - terminal 13 X2
    • Front center speaker output (-) - terminal 12 X2
    • Right rear midrange speaker output (+) - terminal 3 X2
    • Right rear midrange speaker output (-) - terminal 2 X2
    • Left rear midrange speaker output (+) - terminal 11 X2
    • Left rear midrange speaker output (-) - terminal 10 X2
    • Left or rear subwoofer speaker output (+) - terminal 1 X1
    • Left or rear subwoofer speaker output (-) - terminal 2 X1
    • Right subwoofer speaker output (+) - terminal 7 X1
    • Right subwoofer speaker output (-) - terminal 3 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 5 X2
    • Right front speaker output (+) - terminal 7 X2
    • Right front speaker output (-) - terminal 6 X2
    • Left rear speaker output (+) - terminal 15 X2
    • Left rear speaker output (-) - terminal 14 X2
    • Right rear speaker output (+) - terminal 16 X2
    • Right rear speaker output (-) - terminal 8 X2
    • Front center speaker output (+) - terminal 13 X2
    • Front center speaker output (-) - terminal 12 X2
    • Right rear midrange speaker output (+) - terminal 3 X2
    • Right rear midrange speaker output (-) - terminal 2 X2
    • Left rear midrange speaker output (+) - terminal 11 X2
    • Left rear midrange speaker output (-) - terminal 10 X2
    • Left or rear subwoofer speaker output (+) - terminal 1 X1
    • Left or rear subwoofer speaker output (-) - terminal 2 X1
    • Right subwoofer speaker output (+) - terminal 7 X1
    • Right subwoofer speaker output (-) - terminal 3 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 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 amplifier.
    • If greater then the specified range test the circuit for a short to voltage. If the circuit tests normal, replace the amplifier.
  7. If the circuit tests normal, replace the appropriate speaker.
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