TSB: Some 2017 ? 2019 model year Lexus vehicles may exhibit one or more of the following conditions:
?Uneven temperature or air flow between the vents
?Little or no air flow from the vent(s)
?Improper MODE control function
Some vehicles may also exhibit one or more of the following Diagnostic Trouble Codes (DTCs):
?B1441 ? Air Mix Damper Control Servo Motor Circuit (Front Passenger Side Lower Air Mix)
?B1442 ? Air Inlet Damper Control Servo Motor Circuit
?B1443 ? Air Outlet Damper Control Servo Motor Circuit
?B1445 ? Passenger Side Cool Air Bypass Damper Control
?B1446 ? Air Mix Damper Control Servo Motor Circuit (Driver Side Lower Air Mix)
?B1447 ? Rear Air Mix Damper Control Servo Motor Circuit
?B1448 ? Passenger Side Face Servo Motor Circuit
?B1449 ? Rear Air Outlet Damper Control Servo Motor Circuit
?B1453 ? Driver Side Air Outlet Damper COOL Control Servo Motor Circuit
?B1454 ? Passenger Side Air Outlet Damper COOL Control Servo Motor Circuit
?B1455 ? Driver Side Air Outlet Damper FOOT/DEF Control Servo Motor Circuit
?B1457 ? Driver Side Air Outlet Damper Control Servo Motor Circuit
?B1458 ? Passenger Side Air Outlet Damper Control Servo Motor Circuit
?B1486 ? Driver Side Air Outlet Damper Control Servo Motor Circuit
?B1488 ? Rear Air Mix Damper Control Servo Motor Circuit (Front Passenger)
Follow the Repair Procedure in this bulletin to address these conditions.
