Lexus: 1991 LS 400

"How to Install an Aftermarket Stereo 1990 - 1994 Lexus LS400"
http://www.lexls.com/head_unit.html

"Places to Buy or Download Any Lexus Repair Manual"
http://www.lexls.com/repairmanual.html

I have heard some good comments about the Toyota/Scion/Lexus
techinfo subscription. It seems that they require you to
have a JScript browser to subscribe, so the subscription is
available to browsers with the latest technology only. JSscript
on that site is only used to block us Linux users out, not to
create any additional functionality. Strange that Toyota and
Lexus want to support Microsoft.

Check it out though, if you have Microsoft Windows and still
have courage to use the Microsoft Internet Explorer. Buy a
one day subscription, and download everything you need for the
job.
http://techinfo.lexus.com/

Perhaps it was the same guys building the techinfo.lexus.com
infrastructure that wrote the software for engine-transmission
management (and the hesitation problem) on the newer Lexus? :-)