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Interference noise due to antenna

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2005 Porsche 911, 2004 Porsche 911, 2003 Porsche 911, 2002 Porsche 911, and 2001 Porsche 911. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Follow this test routine if the interference noises come from the antenna.
  • As an experiment, it is worth making a comparison by inserting a rod antenna.
RADIO SYSTEM DIAGNOSIS FOR INTERFERENCE NOISE DUE TO ANTENNA

Work instruction Yes No
1
  1. Clean all connections.
  2. Connect a ground strap to the antenna plug.
  3. Connect the other end of the ground strap to a suitable point on the car body.
  4. Check the ground connection with an ohmmeter at the negative terminal of the battery.
Interference noise still present?
  1. Check all antenna mountings for good ground connections with the negative terminal of the battery.
  2. Check all hardware mountings for firm seating and clean ground connections.
Noise present Step 2
Noise not present End		 End
2
  1. Cut the ground cable to the radio approx. 30 cm from the device.
  2. Make a ground connection directly to the radio housing.
  3. Connect the 30-cm-long end of the ground cable to the radio housing.
  4. Connect the new ground connection to a suitable point on the car body.
  5. Check the ground connection with an ohmmeter at the negative terminal of the battery.
Interference noise still present?		 End Replace defective components End
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