PeachParts Mercedes-Benz Forum - View Single Post

Bigdaddybenz · #4 06-17-2006, 11:14 PM

Ok Matt and the rest of the forum elite,

When I follw this procedure---> """37/99-2 GROUP 83 - MODEL 210, CLIMATE CONTROL "EC" LAMP ON: *** UPDATE TO MB-NET MESSAGE NO. 220 DATED APRIL 16, 1999, DTB 17/99 ***: If you receive client complaints on model 210 of "the EC lamp on", please check the system according to the published diagnostic and service procedures. Check if the version coding is correct. Replace the refrigerant temperature sensor in every case. If the refrigerant quantity, temperature or pressure sensors are within the specified values, the low refrigerant level indication should be switched off via the HHT or via the on-board diagnostics (P2 value) as described below. Do not replace AAC push-button modules for this complaint.
Please note that "EC" lamp low refrigerant indication is a redundant feature. Disabling this feature does not compromise the safety of the AC system, because the AC compressor will switch off if low refrigerant (level) pressure is detected.
Switching of the "EC" lamp low refrigerant level detection via the AAC Push-button Control Module can be accomplished as follows:
Switch ignition to position 2.
Set the left temperature to "HI" and the right to "LO"
Switch the ignition off.
While holding the "REST" button, switch the ignition to pos. 2. On the left side of the display, "P1" will be blinking and on the right side, the version code is
displayed. Press the "EC" button, no change is needed for the P1 value.
Press the "EC" button again. "P2", will be blinking on the left side of the display and the value on the right side.
Record this value. Using the right side temperature (red) button add 16 to the displayed value.
Press the "EC" button to store the updated version code.
Turn the ignition off and on again. Reset the left and right side temperatures to 72?F (by pressing the red and blue buttons at the same time).
For warranty, please use Damage Code 83752 04.""""

The CCU will only allow me to set the left side "hi" and the right side "low" if I command the blower to engage, once that happens and I go through the rest of the procedure the following is what is displayed on the CCU's LCD display:

Left side= 1..................................Right side=32
Simultaneously I can see the "P-1" barely blinking in the background as if it were trying to display under the "1" (if I cut the blower off at this point ONLY the 1 is displayed).

Next, when I press the EC buttoin twice, the same thing happens except the "P-2" is barely flashing behind the 1.....The 1 on the left side and the 32 on the right side remain the same...

In both cases, the right temp switch does allow me to change the value of the numbers on the right side of the display.....

Somehow, I feel that I am missing a very basic step in this process that is not allowing me to check and/or change the values as required and posted above by Matt.

ANYONE willing to provide a bit of insight about this circumstance will be greatly appreciated!!!

btw, To further describe my earlier mentioned concern about not seeing the "horizontal arrows" available on the display......I now only have the option of an "up", "down" and "up & down together" options on the CCU's vent controls.......It appears that without the horizontal arrow my AC's ability to properly cool the cabin has been somewhat compromised.

I also ran the self diagnostics from Steve's impressive article and everything appears to be within the given parameters, I did see mention of #7 bar. pressure and though I have seen posts that stated it should be in the mid teens range, mine fluctuates between 13-14!!

Thanks guys!