LEMON Manuals: Even more car manuals for everyone: 1960-2025
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 >> Radio Poor Reception >> Circuit/System Testing
April 5, 2026: LEMON Manuals is launched! Read the announcement.

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. Ignition OFF, disconnect the coax from the antenna located at the rear glass.
  2. Verify the coax connector at the back glass is properly secured and free of any damage.
    • If damage is found, repair or replace as necessary.
  3. Inspect the antenna on the rear glass. Verify all branches of the antenna are intact, with no scratches or other damage.
    • If damage is found, repair or replace as necessary.
  4. Inspect the radio antenna module grounding surfaces and the mounting hardware for any corrosion that may cause a poor ground.
    • If corrosion is noted, clean the grounding surfaces or hardware.
  5. Disconnect the harness connector at the antenna module.
  6. Ignition ON, radio ON, verify a test lamp illuminates between the entertainment remote enable signal circuit terminal 1, and ground.
    • If test lamp does not illuminate, test the circuit for short to ground or an open/high resistance. If circuit tests normal, replace the radio.
  7. Disconnect the antenna coax from the radio and the radio antenna module.
  8. Test for infinite resistance between the antenna coax center terminal and ground.
    • If less than the specified value, replace the antenna coax.
  9. Test for less than 5 ohms of resistance on the antenna coax center terminal from end to end.
    • If greater than the specified range, replace the antenna coax.
  10. Test for less than 5 ohms of resistance on the antenna coax outer shield from end to end.
    • If greater than the specified range, replace the antenna coax.
  11. Test for infinite resistance between the coax center terminal and the outer shield.
    • If less than the specified value, replace the antenna coax.
  12. If all circuits test normal, replace the antenna module.
  13. Ignition ON, radio ON, verify radio reception has improved.
    • If there is still poor reception, replace the radio.
scientia non olet · About LEMON Manuals