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Home >> Cadillac >> 2007 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 113 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Noise Compensated Volume Inoperative >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac SRX. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the noise compensation microphone harness connector.
  2. Ignition ON, test for less than 9.5 volts at the supply voltage terminal B.
    • If greater than the specified value, repair short to voltage.
  3. Ignition OFF, test for greater than 1 ohm between the supply voltage terminal B and ground.
    • If less than specified value, repair short to ground.
  4. Disconnect C3 amplifier harness connector.
  5. Test for less than 1 ohm of resistance between the noise compensation microphone harness connector terminal B and amplifier harness connector terminal 14.
    • If greater than the specified value, repair open/high resistance.
  6. Test for less than 1 ohm of resistance between the noise compensation microphone harness connector terminal A and amplifier harness connector terminal 6.
    • If greater than the specified value, repair open/high resistance.
  7. If all circuits test normal, test or replace the noise compensation microphone.
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