Pinpoint Test F: Sub-Woofer 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 F2  .

1. Check sub-woofer unit(s) fixing screws to body are securely fastened

Are all sub-woofer fixing screws fully secured to the body?

Yes 

Proceed to the next step GO to F3  .

No 

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

1. Check security of trim, harnesses and paper labels in the vicinity of the subwoofer(s)

Are these items secure in the vicinity of the subwoofer(s)?

Yes 

Proceed to the next step GO to F4  .

No 

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

1. Remove subwoofer unit(s) (do not disassemble part) 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 subwoofer unit(s) in hand?

Yes 

Check for obvious debris in subwoofer unit(s). If there is debris and no damage, remove debris and retest for buzzing - if buzzing is repaired re-fit subwoofer unit(s), else replace subwoofer unit(s). If subwoofer unit(s) damaged, GO to F5  .

No 

Re-fit subwoofer unit(s) and further investigate rattle due of nearby trim, modules, harnesses and components

1. Check for an obvious source of damage to prevent any replacement also becoming damaged

Is there an obvious source of the subwoofer unit(s) damage?

Yes 

Remedy source of damage and fit replacement subwoofer unit(s)

No 

Fit replacement subwoofer unit(s)