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Home >> Cadillac >> 2015 >> CTS V, Automatic Trans >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Entertainment Systems >> Cellular System, Entertainment System, And Navigation System (Coupe) >> Diagnostic Information and Procedures >> Radio Controls Malfunction (With Navigation) >> Circuit/System Testing
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Circuit/System Testing

  1. Ignition OFF, disconnect the X1 harness connector at the radio/HVAC controls.
  2. Test for less than 10 Ω between the ground circuit terminal 16 and ground.
    • If greater than the specified range, test the ground for an open/high resistance.
  3. Test for less than 20 Ω between the data shield circuit terminal 3 and ground.
    • If greater than the specified range, test the data shield circuit for an open/high resistance. If the circuit tests normal, replace the radio.
  4. Verify that a test lamp illuminates between the B+ circuit terminal 8 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance.
  5. Test for 2-3 V between the data circuit terminal 1 and ground.
    • If less than the specified range, test the data 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 data circuit for a short to voltage. If the circuit tests normal, replace the radio.
  6. Test for 2-3 V between the data circuit terminal 2 and ground.
    • If less than the specified range, test the data 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 data circuit for a short to voltage. If the circuit tests normal, replace the radio.
  7. Test for less than 1 V between the wake signal terminal 4 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.
  8. Test for less than 1 V between the reset signal terminal 11 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.
  9. Ignition OFF, reconnect the harness connector at the radio/HVAC controls.
  10. Disconnect the X4 harness connector at the radio.
  11. Ignition ON, test for 4.5-5.5 V between the reset signal circuit terminal 27 and ground.
    • 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/HVAC controls.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the radio/HVAC controls.
  12. If all circuits test normal, replace the radio/HVAC controls. Reconnect all harness connectors.
  13. Ignition ON, radio ON, verify the radio/HVAC controls backlighting illuminates and that all controls perform the correct function.
    • If the radio/HVAC controls are still inoperative, replace the radio.
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