What we researched for this specific generation: where an enclosure actually fits, what the factory speakers are, how the factory audio is wired, and which real builds and commercial products exist for it. Confidence badges say how well each figure is sourced — this is research, not manufacturer spec.
Body styles covered: Minivan
These are researched envelopes, not a guarantee. Measure your own vehicle — the numbers here tell you what to expect, not what you have.
| Location | cargo area behind the third row |
|---|---|
| Outer bounding box | No cargo dimensions in inches found. Maker-published, not a measured usable cavity: Toyota's 2010 model-year release says "four-by-eight-foot sheets of plywood can be loaded flat onto the floor", and its 2022 look back at the second generation says "the Sienna could now easily carry 4×8-foot sheets of plywood". Capability statements, not a measured width; the seat position they assume is not given here. |
| Known obstructions | None documented in the pages read. Toyota Canada 2010 names the seat "Split & Stow 3rd Row, 60/40 Split Rear Bench Seat". |
Sizes and depths below are what research turned up for this generation. Confirm against your own vehicle before cutting or ordering — trim levels vary.
| Adapter bracket needed | unconfirmed |
|---|
| Adapter bracket needed | unconfirmed |
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| Factory amp / premium audio | Toyota Canada 2006: "AM/FM/MP3/WMA/CD, 6-Speakers, Steering Wheel Audio Controls" and "JBL Audio, AM/FM/MP3/WMA/CD, 10-Speakers". Toyota Canada 2010: "AM/FM CD/MP3/WMA Player, 6-Speakers" and "JBL Audio, AM/FM CD/MP3 In-Dash 6-Disc Changer, 10-Speakers". Toyota USA 2010-09-28: "a 10-speaker premium sound system" (Limited) and, as an option, "a JBL Synthesis AM/FM/CD with six-disc changer and 10-speaker surround sound audio system". Grade-by-grade assignment for the US cars, wattage and subwoofer: not stated in any page read. 2004, 2005, 2007-2009 not read. |
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Toyota Canada 2006 table: "Behind Front Seats - Max. 4.22 (149)", "Behind 2nd Row Seats - Max. 2.68 (94)", "Behind 3rd Row Seats - Max. 1.24 (43)". Toyota Canada 2010 table: "4.22 (148.92)", "2.68 (94.53)", "1.24 (43.62)". Toyota USA 2010-09-28: "four-by-eight-foot sheets of plywood can be loaded flat onto the floor" (capability statement, not a width). No SAE or EPA label. No dimensions in inches. 2004, 2005, 2007-2009 not read. Toyota Canada's tables print cubic metres with Toyota's cubic-foot figure in brackets; they are Canadian documents, and a US Toyota page may differ. No box made for a 2004-2010 Sienna was found from the box makers checked.
Each link opens the tool with this vehicle already selected.
Measure your own vehicle. Trim levels, factory subwoofer options, and mid-generation changes all move these numbers, and a box cut to a researched figure that does not match your truck is wasted wood. Where a badge reads Unconfirmed, treat the value as a starting point for your own measurement, not as an answer.