LC200 A/C turns off on engine restart

[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

 

[matte36s50]

I currently have Code 49 on my 2018 LX. There is a TSB out on updated software for later vehicles with code 49 (after the servo recall). Others have mentioned that it has fixed their issue. I am currently not getting any AC out of my roof vents.
https://static.nhtsa.gov/odi/tsbs/2020/MC-10174925-9999.pdf

 

[rubi]

In a last effort as I prepped to understand what I would be disassembling and what parts I needed. I sat in my back seat and kept cycling through the vent options, I did this about ten times. It appeared that it was all working and I did not feel a change between the first and final cycle. However, the following day I noticed the AC was at my previous settings and the seats were still on Auto. I checked the code and it was still there, cleared the code and checked again and it's now "00". Not sure what happened but happy I don't have to fix it for now! Been working OK for a month.

 

[Mineral]

May or may not be applicable to others, but I finally fixed my ac issues.

Went to Toyota and had them run a diagnostic on the ac system. Cost $100.

They found the servo was bad for the temp mixer.

Went to a good independent shop. Pulled the dash completely. Replaced all the servos, because didn’t want to have to pull the dash again when the other servos die.

137k miles. Apparently, tundras and cruisers both have these servo issues.

Wasn’t cheap, but problem now solved. No more ac codes.

 

[Mineral]

Indy shop agreed to charge by actual time spent pulling dash and replacing servos.

Their actual time was far lower than the Toyota book time.

 

[Tandem]

See this thread is still active, I reattached the arm after buying the Ih8mud solution, luckily my arm wasn’t broken, however, when going from recirc to fresh the door does not close all the way, anyone have any thoughts?

 

[CharlieChops]

See this thread is still active, I reattached the arm after buying the Ih8mud solution, luckily my arm wasn’t broken, however, when going from recirc to fresh the door does not close all the way, anyone have any thoughts?

If it doesn't close all the way, then the arm is probably not seated properly in the track.

 

[gaijin]

See this thread is still active, I reattached the arm after buying the Ih8mud solution, luckily my arm wasn’t broken, however, when going from recirc to fresh the door does not close all the way, anyone have any thoughts?

Is the cabin air filter fully seated in its frame?

 

[ngpeters]

Code 45 on mine

Lannert:

Did you ever get to the bottom of this one? Mine is throwing a Code 45 as well and has all the same symptoms yours did. Did you end up getting the servos replaced?

 

[m1c498]

Indy shop agreed to charge by actual time spent pulling dash and replacing servos.

Their actual time was far lower than the Toyota book time.

Would you mind sharing what shop you used? Thanks!

 

[fish2live]

I was getting a few codes due to the air filter not seated fully, be sure the front of the filter fully clicks downward and seats, or it will cause the recirculating flap to not close.

Then I was getting intermittent AC, but basically I’d manually turn on the AC and it would look like it turned on and it lit up, and then would turn off 10 seconds later…. That was over 3 weeks of trying it. I thought since it seemed like it was turning on that it wasn’t the relay, (thinking that would cause it to not even turn on) but I seemed to be wrong. I was worried I needed a new compressor but decided to check the “clt” relay (ie AC Clutch) and swapped it with the horn relay and bam, worked like a charm… bought a new relay and good to go.

 

[CharlieChops]

I was getting a few codes due to the air filter not seated fully, be sure the front of the filter fully clicks downward and seats, or it will cause the recirculating flap to not close.

Then I was getting intermittent AC, but basically I’d manually turn on the AC and it would look like it turned on and it lit up, and then would turn off 10 seconds later…. That was over 3 weeks of trying it. I thought since it seemed like it was turning on that it wasn’t the relay, (thinking that would cause it to not even turn on) but I seemed to be wrong. I was worried I needed a new compressor but decided to check the “clt” relay (ie AC Clutch) and swapped it with the horn relay and bam, worked like a charm… bought a new relay and good to go.

Glad to hear you got it sorted. I also had to replace the relay for the AC in my GX470, but at least when that went down, there was a clear error message on the screen that plainly stated "CHECK AIR CONDITIONER". Do you know which codes you were getting?

 

[fish2live]

Yes…. I used the climate interface code process illustrated in this thread and had a 42 and 48 for the filter seating problem that went away when I seated it properly…. and then a 22 (B1422) that is not on the list above…. But when googled is described as a “Compressor Lock Sensor Circuit Malfunction” issue …. But as described I checked the relay first and that fixed it, thankfully.. a new motor and install is like $1500 to $2000…. The relay was $34…

 

[bones25]

I did the same thing with similar success! Thanks again to Skyak!

Do you remember if your recirc door making any noise/clicking/etc when switching between fresh air and recirculating? My recirculating door is in the up position regardless of the setting and was wondering if I should pull it down to the "closed" or "outside air" position (from my understanding that'd be what you did?

 

[CharlieChops]

Do you remember if your recirc door making any noise/clicking/etc when switching between fresh air and recirculating? My recirculating door is in the up position regardless of the setting and was wondering if I should pull it down to the "closed" or "outside air" position (from my understanding that'd be what you did?

If you pull it down with force, you will break it. But sounds like yours is already broken if it never comes down from changing the modes. Mine wasn't cracked, it was just popped out of the original pivot hole, so it was an easy fix.