Toyota Tundra 2003 — technical service bulletin
Bulletin EL01503 · NHTSA communication 10004507 · issued Oct 8, 2003
Technical service bulletin
communication type
Electrical System
component
2003
model years
1
vehicle entries
Official summary
Vehicles equipped with auto-off headlights and trailer towing package may experience a condition where the tow tail relay stays energized when the headlight auto-off function is used. This bulletin provides instructions to install a sub-wire harness to correct this condition. *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.