LX57- AC Damper Servo (1 Viewer)

[blacksheep5405]

Howdy all - i have 2011 LX570 I purchased back in June '23. It has 208,000 miles on it and everything looked great when i got it. Since then, i have had to re-initialize the damper servo on the driver side twice, and it looks like i may have to do it a third time now. Is this an indication that the servo itself needs to be replaced or is there something else that i'm missing? I've looked at ordering the Launch X431 diagnostic tool to re-initialize when it happens (looks like it can do everything i need it to) but i'm concerned there might be something else going on.

I've seen some people say replacing the servo at the dealer is $2k-$3k easy since they'll like take the dash a part. I'm willing to give it a go if i can find a good manual or something.

Any advice or threads i've missed i should look at? Appreciate the help!

 

[NKP Garage]

First step, just press the buttons to get the actual OEM codes that are stored for the HVAC system. Reset the codes, then drive for a while and see if anything comes back.

Here's a good reference link for what the codes mean:

Toyota Sienna Service Manual: Diagnostic trouble code chart - Air conditioning system (for automatic air conditioning system) - Air conditioning

www.tsienna.net

And here's a video of how to get the codes, and reset them. With no other tools, easy to do:

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[bloc]

I wouldn’t mess with any aftermarket tools, just get a VXDiag cable and techstream. Easily the most powerful diagnostic and utility software for Toyotas, since it’s made by Toyota.

With it you can do servo initialization, TPMS programming, and a host of other things.

Also this is a long shot but check to see whether your recirc flap in front of the glove box is working correctly. When that door gets disconnected or broken (which happens a whole lot), it can do all kinds of weird things to the rest of the AC system. And if it is broken there’s a really easy fix available from a vendor here.

 

[NKP Garage]

Also this is a long shot but check to see whether your recirc flap in front of the glove box is working correctly. When that door gets disconnected or broken (which happens a whole lot), it can do all kinds of weird things to the rest of the AC system. And if it is broken there’s a really easy fix available from a vendor here.

Good point. Check the flap and make sure its functioing:

video
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[blacksheep5405]

First step, just press the buttons to get the actual OEM codes that are stored for the HVAC system. Reset the codes, then drive for a while and see if anything comes back.

Here's a good reference link for what the codes mean:

Toyota Sienna Service Manual: Diagnostic trouble code chart - Air conditioning system (for automatic air conditioning system) - Air conditioning

www.tsienna.net

And here's a video of how to get the codes, and reset them. With no other tools, easy to do:

-

First step, just press the buttons to get the actual OEM codes that are stored for the HVAC system. Reset the codes, then drive for a while and see if anything comes back.

Here's a good reference link for what the codes mean:

Toyota Sienna Service Manual: Diagnostic trouble code chart - Air conditioning system (for automatic air conditioning system) - Air conditioning

www.tsienna.net

And here's a video of how to get the codes, and reset them. With no other tools, easy to do:

-

Went through the process and got code 41. I'm seeing mixed info on what that means though, either a solar sensor issue or the Air Mix Door Servomotor Circuit (this seams more likely).

For anyone that has dealt with this in the past, is this going to require replacing the servomotor or just keep on re-initializing until i can re-initialize anymore.

 

[NKP Garage]

Went through the process and got code 41. I'm seeing mixed info on what that means though, either a solar sensor issue or the Air Mix Door Servomotor Circuit (this seams more likely).

For anyone that has dealt with this in the past, is this going to require replacing the servomotor or just keep on re-initializing until i can re-initialize anymore.

Look at the video in the post right above yours. Pull the cover off and check the flap and cabin filter assembly.

 

[blacksheep5405]

Look at the video in the post right above yours. Pull the cover off and check the flap and cabin filter assembly.

I mean to respond to that one yesterday as well. I took at that and everything appears to be working without issue when cycling through the modes. the Flap opens and closes without issue.

I will add I usually hear a rhythmic sound when i first start her up which again makes me think the servo is going bad.

 

[bloc]

I’ve been on this board frequently for almost six years, and can remember maybe one servo going out. So it’s not very common, as an explanation of why you aren’t getting much feedback.

 

[blacksheep5405]

I’ve been on this board frequently for almost six years, and can remember maybe one servo going out. So it’s not very common, as an explanation of why you aren’t getting much feedback.

Thanks bloc - that's what i figured based on the limited info i've been able to find else where. appreciate you chiming in!

 

[joyRidaz]

First step, just press the buttons to get the actual OEM codes that are stored for the HVAC system. Reset the codes, then drive for a while and see if anything comes back.

Here's a good reference link for what the codes mean:

Toyota Sienna Service Manual: Diagnostic trouble code chart - Air conditioning system (for automatic air conditioning system) - Air conditioning

www.tsienna.net

And here's a video of how to get the codes, and reset them. With no other tools, easy to do:

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Great tech and videos, I successfully got my recirculation door fixed, sadly I think I was the boneheaded Toyota tech that initially broke it.

I still have codes that immediately start again right when I let go of the two reset buttons, goes right from blinking 00 back into sequencing codes 41,42,47,48,49. I assumed the reset would take effect for a bit before the codes getting triggered. Weird

I did the battery disconnect for an hour and results are the same.

Physical symptoms are the passenger side blows cold not hot, and is always stuck blowing out of the dash face vents even when on foot mode.

Should I assume it’s safe to buy the replacement servos/actuators or do you think my code reset isn’t sticking for some reason since they immediately start right when I let my fingers off the reset buttons? Maybe I should trace wire and check connections?

@NKP Garage - your tech and videos are always great! appreciated.