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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 34 (Radio) >> Checking Complaints About Car Radio System >> Interference Noises >> Interference Noises, Checking Cable Connections

Interference Noises, Checking Cable Connections

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NOTE: Procedure for interference noises which enter the system via the audio connections.
INTERFERENCE NOISES, CHECKING CABLE CONNECTIONS

Work instruction Yes No
1
  1. As an experiment with the radio switched off, exchange the loudspeaker cables of the loudspeaker involved in the complaint with those of a fully functional loudspeaker at the amplifier output.
  2. Switch the radio on.

Is the loudspeaker involved in the complaint now free of interference noise?
  1. Check the plug contacts of the connecting cable on the amplifier and the loudspeaker.
  2. Repair or clean any defective connections.

Noise no longer present
 
End
 
Noise still present Step 2		 As an experiment, use a new cable from the amplifier to the loudspeaker.
Noise disappeared: insert new audio cables and lay them separately from each other.
 
Noise no longer present
 
End
 
Noise still present Step 4
2
  1. With the radio switched off, exchange the cables between the radio and the amplifier.
  2. Switch the radio on.

Is the loudspeaker involved in the complaint now OK?
  1. Check the plug contacts of the cable on the amplifier and the radio.
  2. Repair or clean any defective connections.

Noise disappeared
 
End
 
Noise still present Step 3
 
Install a functional amplifier.		 End
3
  1. Check the audio wiring harness for a good ground connection.
  2. Measure with a ohmmeter at the negative terminal of the battery. Repair the wiring harness.

Noise still present?		 As an experiment, insert new leads between the radio and the amplifier.
 
Noise still present: install new amplifier and radio.
 
Noise remedied: install new audio cables
End		 End
4
  1. Check the plug contacts of the connecting cable on the loudspeaker.
  2. Repair or clean any defective connections.

Noise still present?		 As an experiment, install first a functional amplifier and then a functional radio.
 
End		 End
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