Buick Rainier 2004–2005 — technical service bulletin
Bulletin 4491 · NHTSA communication 10023137 · issued Dec 1, 2007
Technical service bulletin
communication type
Exterior Lighting
component
2004–2005
model years
7
vehicle entries
Official summary
Headlamp flicker or momentarily dim while driving. 06-06-03-004 supplement. Short wheel base only. *nj updated 1/30/08. *nj
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.