Just installed one 120 amp fusible link (white is alternator) on my 1991 ls400. Your Lexus dealer has this fuse for about $15.00. 120 amp is the key, if you can find one to match in a local parts store.
Finding the fusible link saved my day. While in the process of changing the valve assembly of the power steering pump, I short circuited on the wires on the alternator. It shut down my windows, locks, shift etc. Thanks Mikeslexus