L-SB-0002-21

Some 2016 ? 2017 model year LX 570 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): ?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. ?B1445 ? Passenger Side Cool Air Bypass Damper Control. ?B1446 ? Air Mix Damper Control Servo Motor Circuit (Driver Side). ?B1447 ? Rear Air Mix Damper Control Servo Motor Circuit (Driver Side). ?B1448 ? Passenger Side Face Servo Motor Circuit. ?B1449 ? Rear Air Outlet Damper 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 procedures in this bulletin to address these conditions.