{"nhtsa_id":10004507,"type":"service_bulletin","type_name":"Service bulletin","date_added":"2003-12-17","date":"2003-10-08","document_id":"EL01503","mfr_campaign":null,"replaces":null,"component":"ELECTRICAL SYSTEM","mfr_system":null,"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","document":null,"url":"https://open.wenmarpro.com/bulletins/10004507","components":[{"id":"electrical","name":"Electrical system","parent":null}],"codes":[],"topics":[],"vehicles":[{"make":"TOYOTA","model":"TUNDRA","year_from":2003,"year_to":2003,"match":"exact","vehicle_ids":["2003_toyota_tundra"]}],"as_of":"2026-10-19","note":"A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.","attribution":[]}