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Home >> Porsche >> 2003 >> 911 Carrera 4S, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Entertainment Systems >> Radio - 911 CARRERA (996) >> Checking complaints about car radio system >> Reduced sound quality in one or more loudspeakers

Reduced sound quality in one or more loudspeakers

NOTE: Reduced sound quality may be accompanied by a humming noise.
  1. Switch on the system and change the fader and balance setting on the radio.
  2. Check the fault status.
  3. Find out on which channels the problem occurs.
REDUCED SOUND QUALITY FROM SPEAKERS DIAGNOSIS

Work instruction Yes No
1 Switch the radio between FM, AM, cassette and CD (depending on the available components). Does the problem occur in all program sources? Find out whether it is a question of an objective fault (go to Step 2) or a subjective perception (go to Step 4) of the system behaviour. If the problem only occurs in FM or AM radio reception, check the reception. If the problem persists, replace the radio or CD player.
End
2 Is a humming noise audible on one channel? Check the polarity of the cable connection between the radio and the Bose amplifier. Remedy any possible problems. If the fault has been remedied End.
If the fault is still present Step 3		 Step 3
3 Connect a functional radio/CD player. Problem remedied? Replace radio/CD player
End		 Connect a functional amplifier
End
4 Carry out a comparative test with a functional system. System behaviour identical? Involve the customer in the comparative test.
Customer satisfied End.
Customer not satisfied, consult Porsche After Sales.		 Step 3
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