Pinpoint Test C: Speaker Vibrating (Buzzing) Excessively

1. C1: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Check for extreme bass/treble settings

   Is the audio system output settings for bass and/or treble set too high?

   Yes 

   Adjust settings to appropriate levels

   No 

   Proceed to the next step GO to C2  .

2. C2: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Check speaker unit(s) fixing screws are securely fastened

   Are all speaker fixing screws fully secured to the surrounding trim?

   Yes 

   Proceed to the next step GO to C3  .

   No 

   Tighten the fixing screws to the correct torque as directed in the repair information

3. C3: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Check if the wiring harness is resting against the internal surface of the speaker

   Is there any cabling or other parts of the wiring harness resting against the internal surface of the speaker?

   Yes 

   Re-route and secure the wiring harness so that it is not resting against any internal surfaces of the speaker

   No 

   Proceed to the next step GO to C4  .

4. C4: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Check security of trim, harnesses and paper labels in the vicinity of the speaker units

   Are these items secure in the vicinity of the speaker units?

   Yes 

   Proceed to the next step GO to C5  .

   No 

   Check if the gentle contact with these items, where appropriate, relieves symptoms. If symptoms are relieved, repair the source securely and prevent vibration

5. C5: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Remove speaker and hold in hand, taking care not to hold any moving parts of the assembly and not to damage the foam gaskets

   Does buzzing persist with speaker in hand?

   Yes 

   Check for obvious debris in speaker. If there is debris and no damage, remove debris and retest for buzzing - if buzzing is fixed re-fit speaker, else replace speaker. If speaker is damaged, GO to C6  .

   No 

   Re-fit speaker and further investigate rattle due of nearby trim, modules, harnesses and components

6. C6: SPEAKER VIBRATING (BUZZING) EXCESSIVELY 
   1. Check for an obvious source of damage to prevent any replacement also becoming damaged

   Is there an obvious source of the speaker damage?

   Yes 

   Remedy source of damage and fit replacement speaker

   No 

   Fit replacement speaker

7. C7: AUDIO OUTPUT DISTORTED 
   1. Check for extreme bass/treble settings

   Is the audio system output settings for bass and/or treble set too high?

   Yes 

   Adjust settings to appropriate levels

   No 

   No further action

Pinpoint Tests For Suspected Sub-Woofer Faults 

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