Thanks in advance for anyone's help.

My controls in rear seat do not blow air on the side or ground and furthermore only blow cold air from vent that's above even though the temp is at 85. It does blow hot air from the center console but thats it.

What's strange is when the climate is controlled from the front I can get air and hot air from the floor in the back but it's faint and not powerful

Wifey and I on a road trip and I was reading manual but it doesn't say why the upper vent would ONLY blow cold air etc.

I live in central valley california and would love it if anyone knew a repair shop that specializes in these anywhere in california would travel. Also the the adjustable shocks DONT adjust. I tried to take it to dealer in Fresno and they were clueless.

If anyone can help me with these questions or knows of a repair shop please let me know.

Thanks
Derreck

 

What do you mean by the shocks don't adjust? What is your basis for measurement?

What is the rear console hvac set to when it's at 85? "Auto" ? Can you send a picture of the settings on your rear hvac currently that is not getting you hot air? I can compare with mine.

 

I’ll try to test it later and I’ll tell you about the heat.

I assume of course you have air suspension did you just get the car? Have you had a good and proper look under the car at the suspension etc?

does the height high function work?

 

After tweaking out for days on here and y'alls help I am on a trip now when I get home and get some time saturday going to get under car and look..

Going to measure then hit height button and come back 5 mins later to make sure

I had my wife hit the height button while I watched the back tires and you definately hear a click in the back under the trunk but I didn't wait around to see if it raised...

 

85

hot air blows out of "center" arm rest on the setting of ground and front while no air comes out of front.

then when I change it to up above and front ONLY air comes out from up above vent and blows COLD....

When climate control is controlled from front I can get heat out of center and floor in the back but I can't get air out of floor if it's controlled in the back...

 

I don't know if the function worked because I read on here that you have to wait up to two mins. I had my wife hit the button then I stared at back tire NOTHING lol, I did however hear a click under trunk when she said she hit button. We are on a road trip for newyears when I get home sat will test it properly. Let me know if you have any way i can test it. I am having fun with my multi-meter lately...would love to be able to test computer and relays or what have you but I don't know where to find all that stuff...

 

So, I have two executive package cars and both of them do the same thing as yours, which isn't correct. Neither work on "auto" from the rear center console. The fan never turns on. If you put it to HOT or 85 then cold air comes out of the top as you experienced.

I hooked up techstream and got some air servo codes which are kind of by the driver and passenger knee area.

B1441 air mix damper control servo motor (passenger side hot)
B1457 driver side air outlet servo motor
B1486 driver side air outlet servo motor

More info here: https://www.clublexus.com/forums/ls-...rvo-motor.html

And locations of each servo. Most can be changed just by removing the knee panel stuff, at least the common ones that go out.
https://www.clublexus.com/forums/att...motor-doc6.pdf

More testing procedure here
https://www.clublexus.com/forums/att...k-sequence.pdf

 

you are A GOD send my friend

were you able to fix yours?

After reading about techstream tonight and watching youtube videos of people customizing cars I went on ebay and bought one, and also bought a copy of windows 7 so I can load it on my macbook.

 

There's an option in techstream to initialize all air servo motors. I did so and I'm left with B1457. So looks like I will be replacing that one.

https://www.ebay.com/itm/QUANTITY-1-...sAAOSwUJNeySrf

 

Ok here is my final analysis on the matter.

The rear cooler / purifier in the trunk is only hooked up to the top roof vents that blow in your face. There are no heater hoses running to this unit. It is A/C / cooling / air purifier only. So no matter what happens, cool or cold air is the only thing that will ever come out of these top vents. The rear seat/console FAN SPEED only controls the speed of the rear cooler blower motor. Not more heat from the front.

The rear floor, center console, and "mid level" pillar vents all come from the front HVAC assembly. So your heat will be coming from these.

When manual rear fan speed or vent selection is made on the rear console (not auto mode) then "air purifier" will turn on (as seen on the front hvac screen). This turns on the rear blower and cooler.

When "auto" is selected on the rear console it will blend air from the floor, mid level, and center console rear air ducts to blow into the back seat area.

Techstream should still be ran and codes for the HVAC checked to make sure your air flow and blend servos are working properly to get the right air to the rear passengers. Without techstream you can also pull up HVAC codes by pressing and holding "auto" and "recirc". This will put the HVAC into a test mode and flash any codes with the system. These two digit codes correspond with the Bxxxx codes given in techstream.

Hope this makes sense.

 

Thanks so much for the description, really appreciated all the knowledge.

I tried putting it in "test mode" and only 00 came up on screen. This still doesn't explain why I can get air out of my side and floor vents.

My copy of "fakestream" should come in next couple days and I hope will get a more detailed analysis

Thanks

 

Here are a couple of pictures. One is driver side air outlet servo and air mixture servo. The other is passenger side air outlet servo and air mixture servo. Both of these direct heat to the backseat area. All four can easily be swapped out without removing the dash.

I spent a long time on this and finally figured it out. My servos weren't actually bad and the linkages were not binding. I did the servo initialization in techstream and that still did not solve the problem. They were only moving a very small amount and triggering error codes for the servos. One wasn't even moving at all.

The solution was that I had to remove them from the hvac box, then use techstream active test and move the servo from 0-255 steps through it's full range of motion. Then once set at either 0 or 255 full open or full close, depending on where the hvac flap was most easily resting I reinstalled them. Don't ask why initialization did not do this for me or fix this issue, but it's now solved, I have no servo error codes, and they all move back and forth through full range of motion. I think I'm an expert on this now so if anyone has any issues, codes, or questions let me know.

 

Thanks I am awaiting my "Fakestream" I bought on ebay to really dig in and find out what the hell is wrong with it.

I am sure i will have some questions then.

Thanks again

 

Thanks for your detailed explanation on how the system works and pics.

When I run Techstream the climate control doesn't kick off any codes except

B1421
B1424
B1428

Which when googled are some "solar" modules forums tell you not to worry about.

How would I know that these servos were not working properly unless I took it apart like you did?

What would my next step be?

Thanks

 

Then your system is working as it should. Do you need clarification on what it's supposed to do?

Leave the error code window up and open and operate all the rear controls. Cold to hot, fan low to high, direction, etc. If something malfunctions in mid-request it will pop up on the screen.

There won't always be permanent codes. You can also put a cell phone flashlight over the solar sensors and that code will turn off.