Two problems related to power window have been reported for the 1998 Toyota Avalon. The most recently reported issues are listed below.
Electronic climate control and dash lights/warnings cut off without notice and cannot be restarted unless ignition turned off and allowed to sit >1min, dealer cannot identify specific problem recommends trying to replace module for $1200 although that may or may not fix problem, more frequent failure in summer months.
Drivers side power window relay failed. Nlm.