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Service bulletins for the 2012 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.

372 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
T-SB-0064-10 Rev2018-04-23. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. 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.
T-TT-0226-132018-04-23. Service bulletin. ELECTRICAL SYSTEM. The customer is having difficulty changing the multi-display screen from Day Mode. If the multi-display screen is set to Day Mode when the headlights are on, the setting we be memorized when the engine is turned off.
T-TT-0223-132018-04-23. Service bulletin. ELECTRICAL SYSTEM. The vehicle will not start or ready0on and the steering wheel lock is engaged so that the steering wheel may only be turned very little from side-to-side. If the operator attempts to ready-on or start the vehicle while there is tension on the steering lock actuator, it will not be able to fully disengage when the "ENGINE START STOP" or "POWER" switch is depressed. This condition will cause the "ENGINE START STOP" or "POWER" switch's LED to flash green and the vehicle will fail to ready-on or start.
T-SB-0229-12_Rev2018-04-23. Service bulletin. ELECTRICAL SYSTEM. TSB: REVISION NOTICE November 22, 2017 Rev1: ? Applicability has been updated to include 2014 ? 2018 model year vehicles. Any previous printed versions of this bulletin should be discarded. In the event that a Toyota vehicle becomes submerged in water, many components may be physically damaged. Electrical and electronic components, including wiring harnesses, are particularly susceptible to corrosion and subsequent malfunction. Although any flooding can be damaging, salt water flooding elevates the potential for abnormal conditions and may increase risks due to its highly corrosive and conductive nature. Salt residue also continues to corrode and remain conductive even after a vehicle dries. This bulletin is intended to assist with safe handling and inspection of flood damaged vehicles and to provide basic guidance on likely needed repairs.
T-SB-0012-13 Rev2018-04-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. TSB: OBSOLETE NOTICE: September 14, 2016: This bulletin is now obsolete. Please see T-SB-0134-16.
T-TT-0293-142018-04-02. Service bulletin. AIR BAGS; ELECTRICAL SYSTEM:SOFTWARE. Tech Tip: Safety Connect is a vehicle option which requires a subscription fee for the system to be active. The first year of service is provided in the vehicle purchase price. Once the subscription has lapsed the DCM will be in an inactive state. In some instances, a DCM may need to be replaced even though the customer is not using the service.
T-SB-0012-13 Rev2018-04-02. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE. 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.
T-TT-0246-13 Rev2018-04-02. Service bulletin. VISIBILITY; ELECTRICAL SYSTEM. Tech Tip: Tips for writing a DPR (Dealer Product Report) on manufacturing issues for windows and windshields.
T-TT-0086-112018-04-02. Service bulletin. ELECTRICAL SYSTEM:12V/24V/48V BATTERY; ENGINE. TechTip: Condition - 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.
ZG5_Toyota POL172018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Warranty Policy Bulletin POL17-01: Toyota has received a number of reports regarding the Overhead Console Switch Assembly operation in Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles. In these reports, customers have indicated the switches become inoperative or require excessive pressure to operate.
ZG5_Dealer Email2018-04-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Dealer Email: Toyota has received a number of reports regarding the Overhead Console Switch Assembly operation in Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles. In these reports, customers have indicated the switches become inoperative or require excessive pressure to operate.
ZG5_Region Lette2018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Region Letter: Toyota has received a number of reports regarding the Overhead Console Switch Assembly operation in Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles. In these reports, customers have indicated the switches become inoperative or require excessive pressure to operate.
ZG5_Region Email2018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Region Email: Toyota has received a number of reports regarding the Overhead Console Switch Assembly operation in Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles. In these reports, customers have indicated the switches become inoperative or require excessive pressure to operate.
T-SB-0060-12 Rev2018-04-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM:SOFTWARE. An Initialization Process is required to activate the Entune? suite of Apps & Data Services on Premium HDD Navigation with Entune? and Display Navigation with Entune? head units before they are used for the first time on new vehicles. The Initialization Process may also need to be performed under other circumstances such as following a head unit replacement or after the customer?s personal settings are erased. The Initialization process requires between 3 and 15 minutes to complete, depending on the type of head unit, file size, cellular connection speed, and other factors.
T-TT-0268-132018-04-02. Service bulletin. EQUIPMENT:ELECTRICAL; ELECTRICAL SYSTEM. These concerns can be caused by changes made on the customer?s phone. Make sure to inquire with the customer if the connectivity concerns occurred after receiving an operating system update on their phone or they have restored their phone data/settings recently.
ZG5_POL17-01_War2018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Warranty Policy Bulletin POL17-01: Toyota has received reports of customer concerns in which the power moon roof, power sliding doors or power hatch are inoperative from the overhead console switches or require excessive pressure on the overhead console switches to operate. Due to parts availability this Warranty Enhancement Program will be launched in 2 phases.
ZG5 Dealer Packa2018-04-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Dealer Package: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage on the Overhead Console Switch Assembly on Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles.
ZG5 Dealer Email2018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Dealer Email: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage on the Overhead Console Switch Assembly on Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles.
ZG5 Region Lette2018-04-02. Service bulletin. ELECTRICAL SYSTEM; SERVICE BRAKES, HYDRAULIC; EQUIPMENT. Region Letter: Toyota has received a number of reports regarding the Overhead Console Switch Assembly operation in Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles. In these reports, customers have indicated the switches become inoperative or require excessive pressure to operate.
ZG5 Region Email2018-04-02. Service bulletin. EQUIPMENT; ELECTRICAL SYSTEM. Region Email: Toyota is announcing a Warranty Enhancement Program to extend the warranty coverage on the Overhead Console Switch Assembly on Certain 2012 Model Year Camry, Camry Hybrid, and Certain 2011 ? 2013 Model Year Sienna vehicles.
ZG5 Dealer Daily2018-04-02. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT. Dealer Daily Message: Warranty Enhancement Program ? ZG5 Certain 2012 Model Year Camry and Camry Hybrid Vehicles Certain 2011 ? 2013 Model Year Sienna Vehicles Extension of Warranty Coverage for Overhead Console Switch Assembly.
TS-WI-02562018-03-05. Service bulletin. ELECTRICAL SYSTEM. Service Bulletin sent to all dealers to update the firmware in the affected vehicles VMI computer. This allows for more amperage to draw the Powerkneel up allowing the up-limit switch to be tripped consistently. If the up limit switch is not engaged, a vehicle may not come out of park or the conversion may not operate properly next time it is deployed
TS-WI-02562018-02-12. Service bulletin. ELECTRICAL SYSTEM. Service Bulletin sent to all dealers to update the firmware in the affected vehicles VMI computer. This allows for more amperage to draw the Powerkneel up allowing the up-limit switch to be tripped consistently. If the up limit switch is not engaged, a vehicle may not come out of park or the conversion may not operate properly next time it is deployed
T-TT-0337-152017-08-14. Service bulletin. ELECTRICAL SYSTEM:SOFTWARE; EQUIPMENT:ELECTRICAL:NAVIGATIONAL SYSTEM(GLOBAL POSITIONING SYSTEM); EQUIPMENT:ELECTRICAL:RADIO/TAPE DECK/CD ETC.. TT: When updating either the navigation or radio firmware, verify the vehicle applicability BEFORE beginning the update.
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.

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