QUOTE(davisnetworks @ Nov 25 2007, 03:51 PM)

What would be the best way into replacing the car phone if I wanted to? Would any of the Lexus Pre-Wired things be of any use? Thanks
I think the main aspect of the pre-wired phone system that would be of use would be the audio mute pin. Blake918 found a mute pin under the center armrest (on the driver side) of his 1995 LS400 and I am guessing you will find the same connector on your LX450 - do an advanced search on "Blake918" and "phone" and you will surely find his thread that shows a photo of the connector and mute pin.
You could probably go all the way and play the call through the door speakers if you want - find a thread about how Jainla did this on his 01 LS430. Or you could take the easy way out like Blake and I did and use an add-on speaker hidden under the dash. You can pick up a hot wire at the underdash fuse box or the ignition switch or in the prewire phone harness but the easiest way is to tap into the underdash fuse box (assuming an LX450 has one) with a dummy fuse adapter sold at auto parts stores - these plug into the fuse box and allow you to take power off a fuse with one or more connections coming out of the fuse.
If you remove your phone, avoid cutting any wires. Just unplug things. It will probably take some disassembly of your center console. I have no idea where the main phone ECU is on an LX450 but I assume that, when you find it (probably in the trunk or under the rear seat), you would would unplug the connectors from it and plug the large ones into each other.
There aren't all that many LX450s out there. A coworker of mine - who, BTW, bought my 90 LS from me - told me recently that he wants to buy one. He told me that he thinks they are a great buy.
Please post information about whatever you do on your LX - it might help others.