Last night I installed a GROM USB3 kit into the LX. The GROM website only lists the Toyota as compatible, not the Lexus, but it works fine. I got the USB3 rather than the BT3 because for some reason my Bluetooth was non existent from the infotainment screen. I also purchased the BT module from GROM to resolve this issue.
My recommendation for anyone doing this is to first get the FSM and review how to remove the various trim panels and the infotainment screen. I had the FSM so it was pretty quick but it would be tedious if you're flying blind.
My process was:
1. Put the truck in neutral and the e-brake on, and disconnect battery.
2. Remove the trim panel with the start button. Either remove it completely or just enough to get it out of the way. Do the same on the PS.
3. Remove the two center air vents. The DS air vent I only partially removed, then just pushed out of the way. I recommend removing it completely if you can.
4. Undo the two screws and the two bolts holding the infotainment screen in. Completely remove all the harnesses from the back and set it aside.
5. Undo the two screws and bolts holding the radio unit in, and slide it halfway out. Made sure to protect surrounding surfaces are there are lots of sharp corners.
6. Detach the only harness that matches the GROM harness, and then plug and play. The GROM unit comes with decent instructions, and from what I can tell there is only one way to plug it in.
7. I put the unit itself behind the infotainment screen - there is room. Use double sided tape or velcro.
8. Run phone charging cable as needed, and mic cable, and reassemble.
And some corresponding photos:
Air vents removed/pushed out of the way, along with knee/starter button trim panels. Detach harnesses from infotainment screen and remove completely.
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Remove radio unit below infotainment screen - 2 bolts, 2 screws, and a little wiggling. No need to remove it further, only enough to detach the harness matching the GROM unit.
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Connect the GROM unit and tuck it away. I put it in the cavity behind the infotainment screen. Run phone charging cable as desired. At this point I recommend reconnecting the battery and testing all the connections to make sure everything works. Once confirmed, begin reassembling. I could still reach through the PS air con vent to access the unit, which was handy.
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