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Service bulletins for the 2004 Toyota Sienna

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.

257 on file from NHTSA, as of 2026-10-19.

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Only bulletins with component: Electrical system are shown. Show all

Bulletins, newest first
ZE6_Toyota POL142018-04-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Warranty Policy Bulletin POL14-11: Rev Toyota has received reports where some vehicles may exhibit cracked and/or sticky/melting dashboards as a result of heat or humidity.
T-TT-0092-11 Rev2018-04-02. Service bulletin. SEATS; ELECTRICAL SYSTEM. Some customers may complain that the Rear Seat Entertainment (RSE) system is inoperative if they have misplaced the parental passcode for the system.
T-TT-0092-11 Rev2018-04-02. Service bulletin. ELECTRICAL SYSTEM. Some customers may complain that the Rear Seat Entertainment (RSE) system is inoperative if the have misplaced the parental passcode for the system.
ZE6_POL14-11_War2018-04-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Warranty Policy Bulletin POL14-11: REVISED March 22, 2017: Toyota has received reports where some vehicles may exhibit cracked and/or sticky/melting dashboards as a result of heat or humidity.
ZE6 Dealer Daily2018-04-02. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. Dealer Daily: Voluntary Extension of Warranty Coverage for Cracked and/or Sticky/Melting Dashboards (Instrument Panels) as a Result of Heat or Humidity.
T-SB-0101-11 Rev2017-08-14. Service bulletin. ELECTRICAL SYSTEM. TSB: When servicing interior electrical switches and components, please note the precautions in this bulletin to avoid damaging electrical components and switches. Many lubricants, cleaners, and automotive chemicals contain silicone or other compounds that may contaminate electrical contacts, and therefore increase electrical resistance and decrease switch performance. The use of any cleaners or fluids may increase the risk of further damage to electrical components.
T-SB-0039-152017-08-14. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. TSB: Certain 2003 - 2011 model year Toyota vehicles may exhibit a condition where the instrument panel pad (dashboard) becomes cracked and/or has a shiny/degraded appearance. The pad surface may also become sticky or adherent. Follow the procedure in this bulletin to address this condition.
T-SB-0101-11 Rev2017-08-14. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. TSB: When servicing interior electrical switches and components, please note the precautions in this bulletin to avoid damaging electrical components and switches. Many lubricants, cleaners, and automotive chemicals contain silicone or other compounds that may contaminate electrical contacts, and therefore increase electrical resistance and decrease switch performance. The use of any cleaners or fluids may increase the risk of further damage to electrical components.
T-SB-0039-152017-08-14. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. TSB: Certain 2003 - 2011 model year Toyota vehicles may exhibit a condition where the instrument panel pad (dashboard) becomes cracked and/or has a shiny/degraded appearance. The pad surface may also become sticky or adherent. Follow the procedure in this bulletin to address this condition.
ER11_Re-Notifica2017-08-01. Service bulletin. SUSPENSION:FRONT:CONTROL ARM:LOWER ARM; EQUIPMENT; STRUCTURE:BODY:DOOR; ELECTRICAL SYSTEM. Region Letter: Safety Recall completion is important not only in satisfying government requirements but also is an integral part of our commitment to meet customer expectations of Toyota products. Toyota will be sending Safety Recall Follow-Up Notices to remind owners whose vehicles have not yet had campaign repairs completed. We request your assistance in completing the applicable campaign repairs as owners receive the Follow-Up Notice and contact your dealership. Please note the follow-up activity may cause an increase in your current campaign owner appointments. Toyota will continue with additional follow-up activities in the months to come. Please take this into consideration when analyzing your manpower requirements.
ER11_Re-Notifica2017-08-01. Service bulletin. SUSPENSION:FRONT:CONTROL ARM:LOWER ARM; STRUCTURE:BODY:DOOR; EQUIPMENT; ELECTRICAL SYSTEM. Region Letter: Toyota will be sending Safety Recall Follow-Up Notices to remind owners whose vehicles have not yet had campaign repairs completed. Please note the following information for Regional and PD associates.
T-TT-0362-152017-03-28. Service bulletin. ELECTRICAL SYSTEM; ENGINE. TT: THE VEHICLE MAY BE DIFFICULT TO START OR HAVE AN ABNORMALLY LOW OR ROUGH IDLE AFTER THE BATTERY HAS BEEN DISCONNECTED OR POWER TO THE ENGINE ECM HAS BEEN INTERRUPTED.
T-SB-0012-13 REV2017-03-21. Service bulletin. ENGINE; ELECTRICAL SYSTEM. "TSB: FLASH REPROGRAMMING ALLOWS THE ECU SOFTWARE TO BE UPDATED WITHOUT REPLACING THE ECU. FLASH CALIBRATION UPDATES FOR SPECIFIC VEHICLE MODELS/ECUS ARE RELEASED AS FIELD-FIX PROCEDURES DESCRIBED IN INDIVIDUAL SERVICE BULLETINS. THIS BULLETIN DETAILS THE TECHSTREAM ECU FLASH REPROGRAMMING PROCESS AND OUTLINES USE OF THE TECHNICAL INFORMATION SYSTEM (TIS) AND THE CALIBRATION UPDATE WIZARD (CUW). FLASH CALIBRATION UPDATES CAN ONLY BE APPLIED TO THE VEHICLE/ECU COMBINATION FOR WHICH THEY ARE INTENDED. ECUS HAVE INTERNAL SECURITY THAT WILL NOT ALLOW THEM TO BE PROGRAMMED WITH ANOTHER ECU’S INFORMATION."
POL-14-112015-10-31. Service bulletin. ELECTRICAL SYSTEM: INSTRUMENT CLUSTER/PANEL. TOYOTA: DURING THE HUMIDITY OR HEAT, THE DASHBOARD WOULD BE EITHER STICKY, MELTING, OR CRACKED AND A PART REPLACEMENT HAS PHASED INTO PROGRAM. MODELS 2003-05 4RUNNER, 2005-10 AVALON, 2007-11 CAMRY & HYBRID, 2004-10 SIENNA, 2004-08 SOLARA. *PE
TC-14-0012014-04-25. Service bulletin. AIR BAGS; ELECTRICAL SYSTEM. TOYOTA: SEE DOCUMENT SEARCH BUTTON FOR OWNER LETTER. THERE IS AN EXCESSIVE ELECTRICAL RESISTANCE, ON SOME VEHICLES, WHERE THE CONNECTOR HAD BEEN IMPROPERLY CRIMPED, DURING TIME OF MANUFACTURING, AND OXIDIZATION BUILDUP, IN CONNECTOR, RESULT IN AN ILLUMINATION OF AIRBAG WARNING LAMP. SEE TSB-0069-12 REV 2. MODEL 2004-2009 SIENNA. *PE
012052005-12-20. Service bulletin. ELECTRICAL SYSTEM. REPAIR MANUAL SUPPLEMENT: LASER CRUISE CONTROL BEAM AXIS ADJUSTMENT. *AK
006042004-07-07. Service bulletin. ELECTRICAL SYSTEM. PERSONAL LIGHT OPERATION. *TT
001042004-05-05. Service bulletin. ELECTRICAL SYSTEM. MALFUNCTION INDICATOR LAMP (MIL) ON DIAGNOSTIC TROUBLE CODE (DTC) P0748, P0798, P0985 OR P0986. *TT
03012004-01-02. Service bulletin. ELECTRICAL SYSTEM:WIRING. THERE MAY BE A RED POWER WIRE FOR POWER LUMBAR SUPPORT THAT IS NOT TIED SECURELY AWAY FROM PARKING BRAKE MECHANISM. *TT
EL011032003-10-17. Service bulletin. ELECTRICAL SYSTEM. POWER SLIDING DOOR DRIVE CABLE ROUTING. *TT
002032003-10-14. Service bulletin. ELECTRICAL SYSTEM. SERVICE MAINTENANCE REMINDER LIGHT RESET PROCEDURE. *TT

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.