Toyota Sienna 2011–2013 — technical service bulletin
Bulletin T-SB-0053-13 · NHTSA communication 10132284 · issued Apr 17, 2013
Technical service bulletin
communication type
Visibility
component
2011–2013
model years
3
vehicle entries
Official summary
After initial start-up in cold weather conditions, the front windshield defroster pattern may not meet customer expectations. An updated A/C amplifier is available that improves the front windshield defroster pattern.
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.