ATC (Automatic Tempurature Contral) codes 23, 24, 32 and 33 are all displaying at the same time...

[Thebarnman]

There is no real control where to direct the air and what temperature the air is. Sometimes it's hot, other times it's cold. Recently, the head unit (ATC control panel) was replaced with a new unit. The control door (blend door box) and all actuator motors are new, and there's even a new A/C compressor. Yet, no control of what temperature to set the air and how to direct it (to the main vents, floor etc.)

The ATC diagnostic test revealed error codes of 23, 24, 32 and 33.

CodeAction
23 Blend door feedback control
24ATC mode door feedback failure
32ATC blend door failure
33 ATC mode door stall failure

Does anyone have any idea of what might need to be fixed or replaced at this point to get the A/C working properly?

Thanks!

[FalKen]

http://300mclub.org/forums/viewtopic.ph ... re#p342581

try the above first and see what codes return. If the same codes return, double check all connections and also listen for binding in the mode doors. I've seen way too many blend and mode doors replaced where everything looked ok but came out of place during re assembly, and the doors will not function properly causing multiple malfunctions. I hope the recalibration will rectify your issue. I hope the latter isn't your problem. good luck and report the results back.

[Thebarnman]

Thanks for the reply. I double checked the error codes and the same codes do return. Early next week, I'll have someone else take a listen to see if they can here any binding coming from the mode doors.

In the meantime, the control ATC unit/control panel was very recently installed in the dash, and is brand new (OEM) and came from Chrysler. So as far as I can be certain, that part is working like new/brand new.

The compressor is also brand new and currently works like brand new.

About the mood doors, as you know; a good used working mode door blend box replaced the broken one. If I could have bought a new one from Chrysler I would have, but they were all sold out. Everything about the mode door blending box I currently have worked great for about three weeks, (up to about a week ago) so I can only assume nothing originally went out of place during reassembly. And, it would be hard to imagine something catastrophically went wrong with one of the blend doors all of a sudden a week ago, but not impossible.

As far as recalibration, that had been done at least two times since this problem occurred (about a week ago.) Unfortunately, recalibration does not fix the issue.

The actuators (motors) are all brand new within this past three weeks. So they are operation like brand new.


The good news is there are no leaks and the fan works perfectly. When the unit decides on it's own to blow cold air, it's icy cold. When it decides not to blow cold air, it's hot hot hot! However at the same time, it does not matter what I set the temperature at, it's either super hot or super cold.

Is there a some sort of electronic part between the ATC unit/control panel and the actuator (motors) that receive, modify or convert the electronic signal? A chip or small computer of some sort?

In another words, what can prevent a signal from the ATC unit/control panel to not properly communicate with the actuators/motors besides possibly the connections not being fully connected? (Which by the way, I will have them double check to make sure the connections are fully in place.)

The codes I receive from the ATC diagnostic check are;

23 Blend door feedback control
24ATC mode door feedback failure
32ATC blend door failure
33 ATC mode door stall failure

Thanks!

[Thebarnman]

The car was looked at again last Tuesday. Plugs were double checked and other things looked at, and so far the mechanic has the issue pegged down to the BCM (Body Control Module.) Next week, the BCM will be removed from the car, delivered to Chrysler to be tested for any failure concerning anything to do with signals being dropped, (or not being passed through,) the BCM...that is any signals (settings/commands) being generated and sent to the BCM via the ATC (Automatic Temperature Control.)

This is going to take a bit of time (approximately three days.) Day one, the BCM will be removed early in the morning and immediately transported to Chrysler. Hopefully the people at Chrysler will be able to start looking at it immediatly, so if there are any issues found, they will be able to fix and repair it at that time. We have our fingers crossed that part will only take up to two days at the most. Next, we hope Chrysler will have the BCM ready for delivery on day three to be sent back, and in the hands of my local mechanic with time left to reinstall the BCM, test it, and make sure everything about the ATC is properly reprogrammed, functioning, and have the car ready for me to pick up before that same day's closing (Thursday.)

Before working on the BCM, Chrysler said they will need to know the VIN number, mileage, and what issues the car is having so they can focus their attention to that particular area of the BCM. In the meantime, I'm going to also let Chrysler know about a cruse control issue I've been having (cruse control does not always stay on, or automatically turns off when it's not suppose to) in case that might also have something to do with the BCM.

Since the BCM controls a lot of other electrical functions, I've been asked if there are any other issues with the car. Besides my cruse control shutting off every now and then, the answer is no.

[Thebarnman]

UPDATE

I received my car back Friday early afternoon after dropping it off at the garage early Tuesday morning. The BCM (Body Control Module) was removed from the car and delivered to Chrysler. Mid Thursday afternoon, the BCM was delivered back to the garage where it was reinstalled into my 300m Special. The good news is everything about the signals going from the ATC (Automatic Temperature Control) unit, is making it through the BCM and to the Actuators (motors)...another words, it all works like new again. Unfortunately, when the BCM was reinstalled, one of the Actuators ended up making a clicking noise and had to be replaced.

Now that the Actuator is replaced, everything about the AC unit, (ATC, BCM, Actuators, Blend Doors etc,) all work like new.

After my first afternoon back with the 300m Special, I decided to try the Self-Diagnstic test to see if I would get any error codes back. After the test, I received the code 26. Now of course, I had no idea what 26 was, except it was different from the four codes I was originally getting before any work had been done on the BCM. Before the BCM repair, I was getting codes 23, 24, 32 & 33 (all having to do with the communication to and from the Actuators.) Thankfully, all of those are now gone.

More about code 26 in a moment.

Later that day, I got in the car, started the engine and there was basically no information shown on the ATC display. All that was showing were two little lines that pretty much looked like this " - -" I've seen that happen before when the car was still pretty much new, so being familiar with that, I turned off the ATC, turned it back on again and everything correctly displayed as if nothing had ever happened. However, just for the heck of it, I ran another Self-Diagnostic test just to see if I would end up with anything different. I did. This time I received the codes 36 and the 26 I had earlier that day. Of course I could not wait to find out what these codes mean.

26 is (26 ATC IN-CAR TEMPERATURE THERMISTER FAILURE.)

36 is (36 ATC CONTROL COMMUNICATION FAILURE)

Unless someone rings in and says differently, I'm not going to worry about these two codes, I'll tell you why. The ATC is brand new...NOS from Chrysler..(installed only a few weeks ago,) and at least to me, seems to operate fine.

Code 36 on the other hand, was I think; generated when the display showed two lines "- -." The display has not shown those two lines since, and the ATC currently works and functions normally.

If I didn't know about these two codes, I would have said, it's all working like new, and basically it is. There is however, one thing I am a little worried about. When doing the Self-Diagnostic test, I did hear a click sound...not multiple clicks, just one click; possibly coming from one of the Actuators? After the test was done, I set the temperature control on the ATC to "Lo" then set it to "High." As the temperature climbed, I heard one click sound about mid way. Then I set the ATC to "Lo." As the temperature dropped, I heard only one click sound about mid way. I don't know what that could be, but I'm sure it has something to do with either one of the Actuators, or one of the Blend doors making that sound when the system is controlling the blend of hot and cold air.

The last time I did a Self-Diagnostic test later on Friday night, I don't remember hearing a click sound. In the morning, I could try again simply by setting the ATC from "Lo" to "High" to see if I hear the sound again. But even if I do, beyond that one click sound, currently the system is working and operating like it should.


If anyone is interested, the codes to the ATC and MTC (Manual Climate Control) are listed below...

Codes Common to ATC and MTC

23 BLEND DOOR ACTUATOR FEEDBACK FAILURE
24 MODE DOOR ACTUATOR FEEDBACK FAILURE
25 AMBIENT SENSOR
31 RECIRCULATION DOOR ACTUATOR STALL FAILURE
32 BLEND DOOR ACTUATOR STALL FAILURE
33 MODE DOOR ACTUATOR STALL FAILURE
35 EVAPORATOR SENSOR FAILURE
37 BLEND DOOR ACTUATOR OUTPUT SHORTED TO BATTERY
38 BLEND DOOR ACTUATOR OUTPUT SHORTED TO GROUND
39 MODE DOOR ACTUATOR OUTPUT SHORTED TO BATTERY
40 MODE DOOR ACTUATOR OUTPUT SHORTED TO GROUND
41 RECIRCULATION DOOR ACTUATOR OUPUT SHORTED TO BATTERY
42 RECIRCULATION DOOR ACTUATOR OUTPUT SHORTED TO GROUND
43 COMMON DOOR OUTPUT SHORTED TO BATTERY
44 COMMON DOOR OUTPUT SHORTED TO GROUND
51 SYSTEM VOLTAGE TOO LOW FOR DOOR CALIBRATION

Codes only for ATC

26 ATC IN-CAR TEMPERATURE THERMISTER FAILURE
27 ATC IN-CAR SENSOR FAILURE
34 ENGINE TEMPERATURE MESSAGE NOT RECEIVED
36 ATC CONTROL COMMUNICATION FAILURE

Codes only for MTC

45 A/C CONTROL BLEND DOOR INPUT OPEN OR SHORTED TO GROUND
46 A/C CONTROL BLEND DOOR SHORTED TO BATTERY
47 A/C CONTROL - A/C SWITCH FAILURE
48 A/C CONTROL MODE DOOR INPUT SHORTED TO GROUND
49 A/C CONTROL MODE DOOR INPUT SHORTED TO BATTERY
50 A/C CONTROL ELECTRIC BACKLITE (EBL) SWITCH FAILURE

[FalKen]

glad to see you got somewhere to fix this. as far as code 36 goes. this is usually set if you unplug the atc unit without disconnecting the battery. you can safely ignore this or pull fuse 19 from drivers side fuse panel for a few mins. 36 should away. the code 26, in car temp sensor is part of the atc unit (in your case is new) and should go away. the clicking is one of your door motors. either a defective part or misaligned during install. I'd go with defective part here because misalignment is near impossible BUT still possible.

[Chefsteven74]

So in order to fix any of these issues does the dash need to come off? The mechanic said this could take 5-6 hours, My code is popping up a 23. I bought the car with minor issues last year for $900 so I don't want to put a bunch of money into it.

[Chefsteven74]

I did the re-calibrate to no avail.

[FIREM]

No dash pull actuator is under center of Hvac box. Side console panel off and it is the one nearest the front. 2 hrs max

[M-Pressive]

Or you can join the club and use our how-to video. Save the money. Only $14.95 for a membership.

[Chefsteven74]

I will join however I am far from a mechanic, I can do oil changes, tire rotations and general fixes but other things I have neither the time nor the patience. I also want to say thank you to everyone for the honest help in my 300m Endeavors. one question though, would a front left fender from a 2003 300m be compatible with my 19999 300m?

[FIREM]

Yes fender is a direct bolt on. If you can swap it, you can swap an actuator

[JimL]

Where is the BCM located ?
Can any Chrysler dealer check it ?
Still having the same issues.
JimL

[M-Pressive]

Where is the BCM located ?
Can any Chrysler dealer check it ?
Still having the same issues.
JimL

Have you done anything else? The BCM is under the dash, driver side.

I am not seeing your issue in this thread, did you post it somewhere else?

[JimL]

I did post my issues however, I may not have posted this question on that continuing thread ?
I have replaced the actuator that is behind the radio stack. I was calling it the blend door actuator possibly in error. I think after reading replies to my original problem(code 24 )that i have replaced the mode door actuator.
I still cannot change the heat or AC to floor or defrost after running the diagnostics on the ATC. I also ran the AC for 4-5 minutes then the heat for 5-6 minutes to see if it would self calibrate - no luck . i get all air from the dash vents.
I read the replies to my thread and the links that were supplied and came to the conclusion that my BCM may need to be looked at by a Chrysler dealer (?)
No other apparent issues but this one has been ongoing.
Any help or suggestions are greatly appreciated.
If someone has a picture of where the BCM is located or a picture that gives me some idea of what to look for under the dash that would be a tremendous help.
Thanks
JimL

[Hogie155]

You must disconnect the battery when installing a new Mode door actuator. So the BCM can sense it.