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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 259 (CELLULAR, ENTERTAINMENT, AND NAVIGATION)DIAGNOSTIC INFORMATION AND PROCEDURESRADIO POOR RECEPTIONCIRCUIT/SYSTEM TESTING
2008 Pontiac Grand Prix Base

Circuit/System Testing

2008 Pontiac Grand Prix BaseSECTION Circuit/System Testing
WARNING: This page is about a different car, the 2008 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.

Antenna Coaxial Cable Testing

  1. The antenna coax may have one or two sections between the radio and the mast antenna.
      IMPORTANT: For steps 2 - 6, perform the tests on each of the disconnected coax cables.
    • If greater than the specified range, replace the antenna coax.
  2. Test for infinite resistance between the antenna coax center terminal and ground.
    • If less than the specified value, replace the antenna coax.
  3. 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.
  4. 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.
  5. Test for infinite resistance between the coax center terminal and the outer shield.
    • If less than the specified value, replace the antenna coax.

Rear Glass Antenna Inspection

  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.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.