TSB: Some 2018 ? 2019 model year LS 500 and LS 500h vehicles may exhibit one or more of the following HVAC conditions:
?Uneven temperature or air flow between the vents.
?Little or no air flow from the vent(s).
?Improper MODE control function.
Additionally, some vehicles may store one or more of the following HVAC servo Diagnostic Trouble Codes (DTCs):
?B144A ? Air Outlet DEF Damper Control Servo Motor Circuit
?B1441 ? Air Mix Damper Control Servo Motor Circuit (Passenger Side)
?B1442 ? Air Inlet Damper Control Servo Motor Circuit
?B1443 ? Air Outlet Damper Control Servo Motor Circuit
?B1446 ? Air Mix Damper Control Servo Motor Circuit (Driver Side)
?B1448 ? Passenger Side FACE Servo Motor Circuit
?B1453 ? Air Outlet Damper Cool Control Servo Motor Circuit (Driver Side)
?B1454 ? Outlet Damper Cool Control Servo Motor Circuit (Passenger Side)
?B1455 ? Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Driver Side)
?B1456 ? Air Outlet Damper FOOT/DEF Control Servo Motor Circuit (Passenger Side)
?B1457 ? Driver Side Air Outlet Damper Control Servo Motor Circuit
?B1458 ? Air Outlet Damper Control Servo Motor Circuit (Passenger Side Front A/C Rear Air Flow)
?B148A ? Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Driver Side)
?B148B ? Air Outlet Rear FOOT Damper Control Servo Motor Circuit (Passenger Side)
?B1486 ? Driver Side Air Outlet Damper Control Servo Motor Circuit
?B1487 ? Air Outlet Damper Control Servo Motor Circuit (Passenger Side Front A/C Air Flow)
