Using search, I found this. Hope it helps. I have not used these directions, although they seem pretty thorough.
I just joined the forum today and I wanted to share the lighting changes I have done to my week-old Venza. I confess that when I did it, I did not take pictures of the process (sorry!). So what I can offer is a description of how to tackle it and pictures of what it looks like now. But for that, somebody needs to tell me how to post pictures in the posting, since I just couldn't figure it out!
Anyway, I have the 4-cyl Venza with moon-roof, so I'm not sure if the dome light is the same for those without the glass roof.
The LED bulbs I purchased were little rectangular boards with self-adhesive backs, each containing 6 LEDs. Each LED supposedly contains 3 whatever they call them, so they are advertised as "18-LED boards". But you can really only see 6 lights. But regardless, they are very bright (I bougth the white light ones). Each bulb comes with 3 or 4 different connector types to ensure that you can plug them in any of the regular socket formats.
The ebay merchant is called "maple125", I dealt with him several times and never had a problem (he has 99.7% positive feedback). Just search for 'Venza led lights" and it will come up.
To the installation...
There are 3 lights in the front (the two on the side can be pressed to turn the on/off while the middle one is fixed and turns on either when you open the doors (or unlock them) or by using the control switch next to the roof button. These can be accessed by using a precision screwdriver as a lever to pop open the transparent lids. But VERY carefully! Do it slowly and with care. You do not want to scar the plastic or crack them. I found it easier to pop open both ends first and lastly the center one. Do not attempt to open the whole piece (lights, glasses storage, roof switch, etc) using a lever. It won't budge. You will ruin the roof lining and or plastic for nothing.
Once you've removed all 3, pull out the original bulbs (here's when small fingers come in handy!). Install the LED boards with the correct connectors. I peeled off the adhesive's cover so I could attach the tips to the dome-shaped reflective cup. All you want to do is center each board and make sure it doesn't move around. Make sure you try it on BEFORE putting the lids back on. If the LED board does not turn on, unplug it, rotate the conector 180 degrees and plug it back in. In order for the LED to work it has to be plugged in in a specific way. If it's inverted it won't turn on. Once you confirm all 3 are working fine and you have them centered, replace the lids. Both ends first and lastly the center one. The center was the most difficult to put back on since I was afraid to break the little plastic grips. But if you carefully place one side on and then use the screwdriver as lever again, you'll get it in.
The original lights are very dim. Useless if you ask me. The LEDS now actually illuminate the floor when I open the door at night. Very useful and cool.
Use 2 precision screwdrivers to pop it open. Do it from the bottom (under the door, as the light lid actually curves over the edge) in case you scar the plastic panel, so there are no visible dents. One end of the fixture has a conector, so the fixture only comes out one way. Once it's out, you can unplug the wire to the harness to work more freely. You now need to pop open a cover that hides the bulb inside. Took me a while to figure it out... You need to press from the sides on one end in order to release it. Then do the same on the other end. The cover will come off and then the bulb will be exposed. Remove the bulb, connect the LED, and re-connect the harness to the wiring. Before putting it back in, test to make sure it's connected propoperly! Insert the cover back into place and just press the whole piece back into its original position. The other door is same process.
There are 2 circular lights which actually swivel. This was the one which took me the longest, but with this info, it won't take you long. Using 2 regular size screwdrivers (flat heads), pop put the whole piece away from the roof. Please be careful not to scar the roof liner or the plastic harness! Do it firm but gently. Once it's out, you will see that the piece has plastic latches around it which keep the 2 pieces of molded plastic together. Once you pop them open simultaneously, you can pull the pieces apart to find the 2 bulbs in there. Same as before, install the LEDS, test and position them inside. Put the lid back on and re-insert the whole piece back in the whole in the roof, just with slight pressure. Depending on how you place the LED boards inside, you may limit the movement of the light fixture. So that's something you need to keep in mind when positioning it inside. Also, not all 6 LEDs will shine through, as the circle fixture is smaller than the board. Still, it'll be significantly brighter than the original bulb.
With the precision screwdriver pop out the light fixture. As with the doors, this fixture has one end which is long, so it comes out first on the other end. You can unplug the connector (BE CAREFUL not to allow the wiring to fall inside! Tape it, clamp it, whatever. Just don't let it go!!!). I can't recall if this one has a cover inside, but if it does, it must be very simple to remove, otherwise I would remember! The only tricky part here is that the connector that must be used here resembles those small glass fuses with pointy metal tips (that's the original bulb utilized), and the adapter provided with the LED boards is slightly bigger than the original one. So it take a bit of pressing the contact tabs to accomodate this connector. And the fact that it swivels to turn on & off makes it trickier. Imagine installing a AA battery were a AAA is required, but you can actually push the connectors and make it fit VERY snuggly. Once done and tested, just put it back in and press.
And with this, you will have gone from yellowish faint lighting to strong white (or whichever color you buy) LED lighting.
The glove compartment has a very dim light (took me several days to realize this), which I suppose only helps if it pitch dark. I couldn't figure out a way to remove the bulb as the space is very small. Instead of changing the bulb, I installed a Sylvania 3-LED disc which is self-adhesive, runs on batteries and turns on by pressing it. This is a quick fix but works perfectly.
2009 VENZA V6 AWD EY,LX,NV,TO,WL,Z1
2010 HIGHLANDER HYBRID LTD V6 4WD-i NV,PC,PN,QD,3T,CT