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