The B1440 code on your 2022 Lexus ES indicates a fault in the front left (driver's) power window motor circuit. This code affects your ES's power window system, signaling the driver's window is not operating properly due to an electrical issue.
Understanding B1440 on Lexus ES
The power window system uses an electric motor controlled by the door master switch and door ECU. Code B1440 indicates a circuit fault - the motor isn't receiving power, isn't responding, or is drawing abnormal current.
Common Symptoms
- Driver window doesn't respond to switch
- Window moves slowly or intermittently
- Window stops mid-travel
- Motor makes noise but window doesn't move
- Window falls into door
- Auto up/down feature not working
Primary Causes
- Failed window motor
- Window regulator failure
- Master window switch fault
- Broken wiring in door jamb
- Door module fault
- Window off track
- Binding window channel
Diagnostic Procedure for 2022 Lexus ES
Using Lexus Techstream or compatible scan tool, access power window data. Check for voltage at window motor when switch is operated. Listen for motor attempting to run. Inspect window regulator for broken cables or gears. Check wiring through door jamb. Test master switch function. Verify window glass isn't binding in channel.
Repair Solutions
Replace failed window motor. If regulator is broken, replace regulator assembly - often includes motor. Repair broken wiring in door jamb. Replace faulty master window switch. Realign window glass if off track. Lubricate window channels if binding. After repair, perform window initialization procedure for auto up/down function.