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Home >> Cadillac >> 2007 >> Escalade EXT >> Repair and Diagnosis >> External Pages >> Different car >> Section 1146 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> DTC B1025-B1125 >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. With the scan tool, verify the DTC is set by the amplifier.
  2. Ignition OFF, disconnect the suspect speaker. Test for 1-50 ohms across the speaker terminals.
    • If not within the specified range replace the suspect speaker.
  3. Disconnect the suspect audio amplifier harness connector.
  4. Test for less than 1 volt on both of the suspect speaker output circuits.
    • If greater than 1 volt repair short to voltage.
  5. Test for infinite resistance between both of the suspect speaker output circuits and ground.
    • If resistance is less than specified value, repair short to ground.
  6. Test for less than 1 ohm between suspect speaker output circuits amplifier harness connector and the suspect speaker harness connector.
    • If greater than specified value repair open or high resistance.
    • If all circuits test normal, replace the amplifier.
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