LC200 A/C turns off on engine restart (3 Viewers)

[rubi]

Hold down the Auto and Recirculation buttons then press Start x 2 w/o starting engine.
This should display any codes, mine is showing "49" and will not reset after holding Front and Rear defrost.

 

[Lannert]

Hold down the Auto and Recirculation buttons then press Start x 2 w/o starting engine.
This should display any codes, mine is showing "49" and will not reset after holding Front and Rear defrost.

View attachment 3922217

I will perform this when I get home tonight and report back. Thank you for the help!

 

[Lannert]

Hold down the Auto and Recirculation buttons then press Start x 2 w/o starting engine.
This should display any codes, mine is showing "49" and will not reset after holding Front and Rear defrost.

View attachment 3922217

Code 45 on mine

 

[rubi]

Code 45 on mine

This is what I have found for codes. They all start with "B14" then the number like your 45 and my 49. Haven't dug in any more to see how to resolve the problem yet.

• 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 (indicates a fault in the bypass damper actuator or harness)
• 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-Air Servo Motor Circuit (face-air duct actuator)
• B1449 – Rear Air Outlet Damper Control Servo Motor Circuit (rear-HVAC outlet actuator)
• B1457 – Driver-Side Air Outlet Damper Control Servo Motor Circuit (driver side outlet actuator)
• B1458 – Passenger-Side Air Outlet Damper Control Servo Motor Circuit (passenger side outlet actuator)
• B1486 – Driver-Side Air Outlet Damper Control Servo Motor Circuit (alternate designation for the driver outlet actuator)
• B1488 – Rear Air Mix Damper Control Servo Motor Circuit (Front Passenger)

Additionally:
Here is a link to a PDF about servo motors for 2016-2017 although you may find it helpful for your 2018. Neither of our codes look easy to solve.

https://static.nhtsa.gov/odi/tsbs/2021/MC-10187278-9999.pdf