Cadillac Deville 2002–2003 — technical service bulletin
Bulletin 020844013 · NHTSA communication 634300 · issued Aug 1, 2002
Technical service bulletin
communication type
Equipment
component
2002–2003
model years
2
vehicle entries
Official summary
Some customers with vehicles equipped with the navigation system may comment on an intermittent loud hum / buzz noise coming from the rear door speakers. *tt
Vehicles covered
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.