Lexus Troubleshooting Questions? Ask a Lexus Expert
Let's see what's going on with this window switch. Are you seeing any blinking lights on the window switches?
You may need to disconnect the battery, cross the cables together for about 1 minute and then hook them back up like normal to get the system to reset.
Then you should do the following:
1. Operate each window from the respective switch. From full up roll the window all the way down and then all the way back up. At this time, the driver’s door power window switch illumination blinks.2. Push the driver’s door power window switch and lower the window halfway.3. Pull up the driver’s door power window switch until the window closes, and continue to hold it up for more than one second. At this time, the driver’s door power window switch changes from blinking to constant illumination.4. Check for the proper operation of the one-touch open and close function by fully pushing the switch down once and fully pulling the switch up once.5. Repeat steps 2 – 4 on each door’s power window switch.6. Check that each door’s power window switch light is on.
If you follow these steps and it still doesn't work then you may need to test and replace the master switch.
Yes exactly. This forces all modules to reboot. You could also disconnect the cables and leave them off for about 6 hours or so and accomplish the same thing, but the 1 minute cable cross is much quicker.
Did all of the lights seem to blink like they were supposed to?
If the lights aren't blinking like they should then there is either a wiring issue somewhere or a BCM problem.
I would probably reset everything and try again and see if the lights are blinking.
Also, you might need to get your hands on a scan tool that can tell you what the signal from the switches are showing. If you hit the switch and it doesn't show on the scan tool then the bcm is likely bad.
Let me look at the wiring diagram and see if something stands out that might make the door lock switch not work either. If you move the driver door back and forth while trying the switches will it work? Sometimes the wires in the door jamb will fray and lose connection intermittently.
I still think something is going on with the master switch or maybe one of the connectors on the back of the master switch. It just seems like something is faulty in that switch.
The BCM - Toyota calls it a body ecu- is under the left side of the dash.
Please let me know if you need additional info.