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Home >> Cadillac >> 2005 >> CTS Base, 2.8 T, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 768 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Navigation System - Voice Guidance Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2013 Cadillac CTS. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the radio harness connector X4 and amplifier harness connector X3.
  2. Test for less than 1 volt on the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.
    • If greater than specified value, test for a short to voltage.
  3. Test for greater than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and ground.
    • If less than specified value, test for a short to ground.
  4. Test for less than 1 ohm between the navigation audio signal (+) circuit radio harness connector terminal 7 and the amplifier harness connector terminal 13.
    • If greater than specified value, test for an open/high resistance.
  5. Test for less than 1 volt on the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.
    • If greater than specified value, test for a short to voltage.
  6. Test for greater than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and ground.
    • If less than specified value, test for a short to ground.
  7. Test for less than 1 ohm between the navigation audio signal (-) circuit radio harness connector terminal 17 and the amplifier harness connector terminal 5.
    • If greater than specified value, test for an open/high resistance.
  8. If all circuits test normal, replace the radio.
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