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Home >> Hummer >> 2008 >> H3 Base, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 168 (Cellular System, Entertainment System, And Navigation System) >> Diagnostic Information and Procedures >> Digital Radio Malfunction >> Circuit/System Testing
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Circuit/System Testing

WARNING: This page is about a different car, the 2008 Cadillac STS. However, it is still accessible from the selected car via links, so may be relevant.

Digital Radio Antenna Circuit Malfunction

  1. Ignition OFF, disconnect the digital radio antenna coax from the digital radio receiver (DRR). Connect the EL-48028  to the DRR.
  2. Ignition ON, radio tuned to XM, verify XM reception is clear and uninterrupted.
    • If reception is not clear, replace the DRR.
  3. Ignition OFF, disconnect the digital radio antenna coax from the digital radio antenna.
  4. Ignition ON, test for less than 1 volt between the antenna coax center terminal and ground.
    • If greater than the specified range, replace the antenna coax.
  5. Test for infinite resistance between the antenna coax center terminal and ground.
    • If less than the specified value, replace the antenna coax.
  6. Test for less than 5 ohms on the antenna coax center circuit from end to end.
    • If greater than the specified range, replace the antenna coax.
  7. Test for less than 5 ohms between the two ends of the coax cable outer shield.
    • If greater than the specified range, replace the antenna coax able.
  8. Test for infinite resistance between the coax center terminal and the outer shield.
    • If less than the specified value, replace the antenna coax.
  9. If all circuits test normal, replace the digital radio antenna.

Digital Radio Signal Circuit Malfunction

  1. Ignition OFF, disconnect the X2 harness connector at the radio.
  2. Radio ON, test for 5.0-7.5 volts between the signal circuit terminal 1 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DRR.
    • 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 DRR.
  3. Test for 5.0-7.5 volts between the signal circuit terminal 2 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DRR.
    • 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 DRR.
  4. Test for 5.0-7.5 volts between the signal circuit terminal 9 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DRR.
    • 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 DRR.
  5. Test for 5.0-7.5 volts between the signal circuit terminal 10 and ground.
    • If greater than the specified range, test the signal circuit for a short to voltage. If the circuit tests normal, replace the DRR.
    • 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 DRR.
  6. If all circuits test normal, replace the radio.
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