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Probably a lift gate latch, the switch that turns the light on in the dash is part of the latch, also check the wiring inside the rubber tube at the top of the lift gate door when it's open, could be a broken wire in there
This sounds like you have a grounding problem with your hatch circuits. This type of malfunction usually occurs when two systems (the hatch lift and the Lift glass release) are supposed to be sharing the same ground, but one of the systems has a bad connector or a broken wire. It then "activates" the other system by grounding THROUGH the system that it is supposed to be sharing ground with.
What I would do in your case is to take a HARD look at the wires that are in the conduit that runs between the lift gate and the body. These wires flex every time the lift gate is opened and closed, and are prone to breakage.
The way you describe it, it sounds like the lift gate motor is losing contact at about 1/3 to 1/2 of the way up, and that is when it grabs ground through the glass release solenoid.
There was a safety bulletin by Toyota regarding the lift gate of the 2007 Sienna. I had to jump into the cargo area once to avoid being crushed by the lift gate coming down unwantedly.
Contact your dealership..they replaced the lift gate hydralics (under warranty at the time) and the problem was solved.
One or both of the shocks are bad, you can put the liftgate on manual mode by a switch in the overhead console. (see your owners manuel) Look at the shocks, one or both will be leaking oil. You can get the shocks at you local parts store.
try removing your shocks/struts for the lift gate. once removed, check
to see if they fully extend in and out of the barrel. You may have bent
shocks/struts. Also, check to see there is nothing preventing the
lift-gate from opening such as a bolt or acorns between the spoiler and
try removing your shocks/struts for the lift gate. once removed, check to see if they fully extend in and out of the barrel. You may have bent shocks/struts. Also, check to see there is nothing preventing the lift-gate from opening such as a bolt or acorns between the spoiler and the roof...