I have a 1991 lexus that seats and electric door locks stop working. What can it be besides its breaker switch

Check in the under hood fuse block or power distribution center for fuse #72 and #75 these are 60 amp fuses. If the problem isn't there you have Two separate problems, check at the switches for battery voltage and ground. The most common problem is switches.

Do you know what a wiring diagram is ? How to use a DVOM - digital volt ohmmeter to test electrical circuits ? View wiring diagrams to see what all is involved in making the windows work . 05 Lexus probably has a electronic control module used to control windows . Does the passenger window only work from it's door switch ? Does the driver master switch open / close that window ?

Check the fuse and circuit breaker "A". I have the same problem except I am missing the circuit breaker. There was a circuit breaker that was jury rigged with some wires that worked for awhile until the wires broke.

Have you scanned the wires?

There are 11 electronic control units(ECU) located in the dash area. They are as follows.
Engine + trans. ecu. behind right side of the dash.
Abs + traction ecu. beside the engine ecu.
electric mirror ecu. behind upper right side of dash.
SRS ecu. behind dash at console.
Shift lock ecu. in center console near shifter.
Power seat ecu. under drivers seat.
progressive power steering ecu. behind left dash left of column.
Steering column tilt + telescopic ecu. behind left dash above column.
Anti-theft ecu. behind far left of dash.
Cruise control ecu. just below the anti-theft ecu.
My guess is you are looking for the engine ECU but you may be
looking for 1 of these in the future. Hope this helps.

hello. The seats do work off of a fuse. Change that fuse and you may be good to go. Joe

my radio is not working today changed my battery and i don't know my code

hi there
from what it sounds to me is that the alarm is still in anit theft mode
i had this happen to my vehicle

one thing you can try is lock all the doors try and unlock from the passenger side make sure that all the lock come up to the top where they should be
then try it

if that does not work then lift up the rear of the car like it was being towed and it should reset the alarm
short of that you will have to have alarm shop come to you
don

http://www.toyotanation.com/forum/showthread.php?t=300887
Full version about Automatic Seatbelt troubleshooting for 87-91 Camry written by Professor Oleg Turkin

the filter in the a/c is filled with dust this maybe one problem so first clean it or else may be the tripping switch is weak or else may be the voltage is low