Like Chrysler (and Renault), Toyota introduced a minivan in 1984; as with the Plymouth, Dodge, and Renault minis, it was powered by a four cylinder engine with a standard manual transmission. Like the first GM and Ford minis, though, it used rear wheel drive. It was unique in its mid-engined design, and optional four-speed automatic transmission, though.
In 1984, Toyota set out to capture a portion of the rapidly growing minivan market that Chrysler had recently created. Instead of following Chrysler's lead, Toyota designed a "one-box" type vehicle powered by a mid-mounted 2.0L four-cylinder engine driving the rear wheels. Advanced options, which would not arrive on competitors' vehicles for years, were dual air-conditioners with separate controls for front and rear seat occupants, and an ice maker/cooler box. Like other minivans, it could seat up to seven people, and was offered in both passenger and cargo versions (the cargo version came in 1985). The cargo version of the Caravan/Voyager had metal, windowless sides; the Toyota Van simply deleted the seats.
Just as the original 2.2 liter carbureted Chrysler engine was too slow with an automatic, the Toyota 2.0 needed an upgrade, and received one in 1986 - to 2.2 liters (Chrysler offered a 2.6 first, then a turbo, 2.5, and finally a V6). Along wiht the new engine came a front passenger swivel seat and interior upgrades.
1987 brought a four wheel drive option, rather different from Chrysler's all-wheel drive. A two speed transfer case was used for manual transmissions, a single-speed with automatics. Interior seating was upgraded again. Copying Plymouth's "magic wagon" name, Toyota advertised its passenger van as Wonderwagons, but failed to give them a name less generic than Passenger Wagon. An optional Captain's Chair package, taking off of Plymouth's similar offering, gave more luxurious seating for seven, with an adjustable driver's seat and - going one step further - middle row chairs that swiveled and reclined. A cooler/ice maker could also be added, if dual air conditioning was purchased. The Cargo Van also got all wheel drive; it had over 187 cubic feet of cargo space (155 cubic feet with optional front passenger seat), a 2,020 pound payload capacity with the manual transmission, and a 2.2 liter electronically fuel injected engine. The van had a sliding side door and high-opening rear hatch.
In 1990, faced with lackluster sales, Toyota redesigned and renamed the Van, calling it the Previa ("preview"). It still relied on rear wheel drive and a mid-mounted four-cylinder (now up to 2.4 liters), and still had optional four wheel drive. The cargo version was dropped - Chrysler dropped their cargo van a year later - but now the rear seats could fold up and the center seat could be removed to accommodate large cargo, including the infamous four by eight plywood. The shape was, in Toyota's words, "designed in the U.S. for American styling tastes. Thanks to a unique space-efficient mechanical layout, Previa offers outstanding interior room, optimal weight distribution, and a low center of gravity for superior stability." This was somewhat true for 1990, when Chrysler was still selling minivans that were essentially tall Reliants [see this link], but the revised, second-generation Caravan and Voyager would be larger, more comfortable, and much better-handling, with front wheel drive and a V6, and Previa sales never seriously challenged Dodge or Plymouth. The shape also did not take off any better than the "Dustbuster" General Motors minis.
Federal regulations brought safety changes in 1992, with a driver's side airbag, side impact and rollover protection, and a center high mounted stop light. The Previa was the first minivan to meet all passenger car safety standards, a position it would hold for a brief time. A passenger airbag joined the crowd in 1994.
While a turbocharged Chrysler minivan had been available in 1989 and 1990 - displaced by a V6 - the Previa gained a supercharger in 1994, increasing power at the cost of requiring premium fuel. The Previa also gained leather seats, a CD player, and dual moonroofs. Still, sales were only a small fraction of the Voyager and Caravan.
In 1998, after 14 years of watching the Van and Previa sales in the US go nowhere, Toyota introduced the Sienna (named after the color or city, your choice), which copied the Chrysler formula much more closely. It was powered by a V6, and ran on the front-drive Camry platform. It added modular, adjustable seats with seatback trays, more cupholders, front and rear power outlets, many storage compartments, and other interior features. ALR/ELR seatbelts were used on all outboard seats, and antilock brakes and tire pressure warning were standard. A power door was added as an option in 1999, along with dual built-in seats. The Sienna seemed to be more favored, though the Honda Odyssey, which also closely followed the Chrysler design, was more popular and became the first serious challenger to Chrysler's dominance. It didn't take long for Chrysler to lose their overall majority share.
Three years later, in 2001, the engine was worked over with variable valve technology (raising horsepower by 16 while raising gas mileage) and verified as a low emissions vehicle; and skid control was added. The exterior and interior were also freshened.
The Symphony edition appeared in 2002, with an eight-speaker JBL stereo and a wide variety of other luxury features.
The 2004 Sienna not only matched the Chrysler minis but leapfrogged them, and was made much more American - being assembled in Indiana, with 90 percent of its content sourced from American suppliers. A new chassis seems to have been designed specifically for the Sienna, with four inch wider track but three foot tighter turning radius - a foot tighter than the next best minivan. The wheelbase is five inches longer than the 2003 model. Passenger volume beats all other 2004 minivans, with a 45 cubic foot increase in interior volume. Especially appealing are split (60/40) third row bench seats that fold flat into the floor, in a rapid, single-hand movement. Again, 4x8 sheets of plywood can be put in, if the second row seats are removed.
A new V6 produces 230 horsepower; thanks to a five-speed automatic, it produces both the fastest sprints to 60 and the best mileage of any 2004 American minvian. The engine and transmission are both made in West Virginia.
New brake pads have been designed to avoid fast wear problems on some 2004-2005 Siennas. It's part number 04465-45030. They might be a little noisier, but they wear better.
If rear passengers in 2004 Siennas and early 2005 Siennas complain that the entertainment system screen is hard to see, the dealer may be able to replace it with one that's been adjusted with a different screen position through a Panasonic exchange program.
The computer has been upgraded on 2004 Siennas and some 2005 Siennas to improve response during heavy acceleration, reduce gear hunting from 20-30 mph, and make downshifts faster from 10-20 mph. This will only be done if you actually have problems in these areas, and takes about 1-2 hours, so don't ask your dealer to do it if you haven't had any issues! (It's covered for 96 months or 80,000 miles.)
New wiper arms have been designed for the rear wipers of 2004-05 models. (It was introduced as a running change on 2005s to improve the rear wiper.) It's part 85241-20170 for the arm and 85212-13030 for the blade.
If a/c is lost on 2003-2004 models, the fault may be with the magnetic clutch on the compressor. A revised part is available (90987-02028).
Getting a popping noise on your 2004 or 2005 with a JBL audio system? The problem could be the amplifier staying on even though the ignition is off; it could kill your battery over time. The dealer can replace the amplifier if it happens to you. (It was fixed as a running change in the 2005 model year.)
The 2011 Toyota Sienna marks the third generation Sienna. Sienna will now offer new models, including a sporty SE and a four-cylinder powertrain, as it continues to be the only offering in the segment with an all-wheel-drive option. The Sienna was designed by Toyota's Calty Design Research and developed at Toyota Technical Center in Ann Arbor, Mich., with assembly being accomplished at Toyota Motor Manufacturing, Indiana.
Dimensionally, the new Sienna rides on the same wheelbase as the prior generation, but it is wider and slightly shorter overall. A Cd of 0.306 contributes to a quiet cabin and improved fuel economy. A choice of two responsive DOHC engines will be available: a 3.5-liter V6 or 2.7-liter four-cylinder engine. Both engines offer Dual Variable Valve Timing with intelligence (VVT-i), roller rocker arms and an Acoustically Controlled Induction System (ACIS) that changes the length of the air-intake pipe to supply more torque on demand.
The 3.5-liter V6 makes 266 horsepower at 6,200 rpm, with expected EPA-estimated mileage ratings of 18 mpg city/24 mpg highway (16 mpg city/22 mpg highway on AWD models). It also has a 3,500-pound tow capacity. With 187 horsepower at 5,800 rpm, the 2.7-liter four-cylinder engine delivers EPA-estimated fuel efficiency ratings of 19 mpg city and 26 mpg on the highway. Both engines are matched with electronically controlled six-speed transmissions with sequential shift.
The suspension uses front MacPherson struts, combined with rack-and pinion steering and Electronic Power Steering (EPS). Under-body aero parts also contribute to dynamic performance.
Models and Features
The Sienna will come in five grades: Sienna grade, LE, SE, XLE and Limited. All-wheel-drive is available with the V6 on LE, XLE and Limited models. The Sienna can be configured with seven- or eight-passenger seating, in front-wheel-drive or all-wheel-drive, with a range of prices and features. The Sienna and LE grades are available with either the 2.7-liter four-cylinder engine or the 3.5-liter V6.
The Sienna grade and LE are equipped with standard features that include: cruise control, Daytime Running Lights with manual on/off feature, tri-zone air conditioning, six- or eight-way-adjustable driver's captain's chair, power windows with auto up/down and jam protection, AM/FM CD player with four speakers, XM compatibility, auxiliary jack, power door locks, remote keyless entry, and three 12V outlets, among other amenities. The Star Safety SystemTM, which includes Anti-lock Brakes (ABS), Electronic Brake-force Distribution (EBD), Brake Assist (BA), Vehicle Stability Control (VSC), and Traction Control (TRAC), is standard on all models.
The LE V6 model also includes dual power-sliding doors and power rear door, a power driver seat with power lumbar support, electrochromatic rearview mirror with Homelink, backup camera, rear window sunshades, AM/FM/MP3 CD player, integrated XM satellite radio (subscription required), auxiliary audio jack, USB port with iPod connectivity, and hands-free phone capability and music streaming via Bluetooth wireless technology, and steering wheel audio controls. These features can be added to the four-cylinder model as a package.
The XLE builds on the LE, adding features such as leather-trimmed seats, moonroof, and an anti-theft system with engine immobilizer, remote keyless entry, and heated front seats. Select optional XLE equipment includes a 10-speaker JBL premium sound system with voice-activated DVD Navigation and Panorama rear camera with integrated back-up guides, XM NavTraffic (subscription required), rear-seat Dual View Entertainment system, and an auxiliary audio jack and USB port with iPod connectivity.
The Limited has several additional features, including new second-row Lounge Seating and a power 60/40 Split & Stow third-row seat, front and rear parking sonar, dual moonroof, Smart Key, and Safety Connect. Select options include those available on the XLE plus HID auto high-beam auto-high beam headlamps, rain-sensing wipers, and Pre-Collision System (PCS) with Dynamic Radar Cruise Control.
New for 2011 is the sporty SE model. With a sportier design both inside and out, the SE has 19-inch alloy wheels. It sits lower than other Sienna models, on sport-tuned suspension.
The interior is more than two inches longer, and the seats now have longer ranges of travel. The front seats have more rearward travel, and the steering wheel has a less upright position. The cabin is also wider than previous generations.
A Toyota first rear-seat Dual View Entertainment Center is another option. The system uses two displays side-by-side to create a 16.4-inch widescreen image from a single source. When two separate entertainment options are called for, the system can split the screen into two individual screens, each with input from separate sources. Used as a single screen, it can be easily seen from the third row, and it can be operated from any seat via remote control. Used as two screens, the system can accommodate the preferences of two separate passengers who might want to play a video game or watch a second DVD simultaneously via auxiliary inputs.
Other technological upgrades include a Toyota-first Panorama Camera rear monitor. It provides two views behind the vehicle including a 180-degree view, and on-screen back-up guides, helping drivers to reverse out of parking spots or driveways.
An enhanced version of Toyota's Vehicle Stability Control (VSC) is standard on all 2011 Sienna models. VSC coordinates the Anti-lock Brake System (ABS), Electronic Brake force Distribution (EBD), Brake Assist with Traction Control (TRAC) and Electric Power Steering (EPS), to help provide a the driver a better-integrated, controlled vehicle in the event of an emergency maneuver.
A Pre-Collision System (PCS) with pre-collision seatbelt system is an available option on Limited, as is the latest in advanced vehicle control technology: Vehicle Dynamics Integrated Management (VDIM). The VDIM system coordinates brake control with engine output and steering inputs, allowing all the control and safety systems to cooperate. Unlike reactive traction systems, VDIM operates proactively.
Seven airbags are standard equipment, including dual-stage front and seat-mounted side airbags for driver and front passenger, plus a new driver's side knee airbag. Side curtain airbags cover the length of the cabin, from the front seats to the third row.
The new Safety Connect telematics system is standard on Limited and optional on XLE. Safety Connect offers four safety and security features: Automatic Collision Notification, Stolen Vehicle Location, Emergency Assistance Button (SOS), and Roadside Assistance. A complimentary one-year trial subscription is included. In case of airbag deployment or severe rear-end collision, Automatic Collision Notification is designed to automatically call a response center. If a response agent cannot communicate with the occupants, the agent can contact the nearest emergency-services provider to dispatch assistance.