Buick Rainier 2006–2007 — technical service bulletin
Bulletin 4520 · NHTSA communication 10023417 · issued Oct 1, 2007
Technical service bulletin
communication type
Exterior Lighting
component
2006–2007
model years
12
vehicle entries
Official summary
Automatic headlights inoperative until shifter is placed into gear. *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.