Automatic Climate Control Diagnostic Trouble Code (DTC) Memory - Mercedes-Benz Forum
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post #1 of 150 (permalink) Old 06-26-2008, 06:25 PM Thread Starter
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Automatic Climate Control Diagnostic Trouble Code (DTC) Memory

Preparations for DTC readout:

Ignition ON
Temperature selector left "HI", right "LO".
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The led in the RECIRCULATE button flashes and the display shows "di R"
Press AUTO repeatedly until all DTC's (refer to DTC table) are displayed. Record each DTC as it is displayed.
Each malfunction (short circuit, open circuit, etc.) has a specific DTC assigned to it.
The letter "E" (Error) is displayed in the left side of the display and the DTC is displayed in the right side of the display. By pressing the right AUTO button, the next DTC stored in memory will be displayed.

To erase: Only possible after all DTC's are read out. Simultaneously press both AUTO > 2 secs. "d" will be displayed in the left side of the display window and "FF" on the right side.
To cancel erase: By pressing AUTO the current faults will appear again.

Set temperature selector to normal setting.
Turn ignition OFF to end test.

DCT table:

B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines
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post #2 of 150 (permalink) Old 07-15-2008, 09:01 AM
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Take it once this is done if a problem reoccurs the code will flash up again if you run the diagnostic? Strange but when I refilled the air con gas the low refreidgerant fault code went of it's own free will when I re-ran the diagnostic after refill.
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post #3 of 150 (permalink) Old 05-03-2009, 02:12 PM
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Quote:
Originally Posted by Matt L View Post
Preparations for DTC readout:

Ignition ON
Temperature selector left "HI", right "LO".
Within 20 seconds, press REST and EC simultaneously for more than 5 seconds
The led in the RECIRCULATE button flashes and the display shows "di R"
Press AUTO repeatedly until all DTC's (refer to DTC table) are displayed. Record each DTC as it is displayed.
Each malfunction (short circuit, open circuit, etc.) has a specific DTC assigned to it.
The letter "E" (Error) is displayed in the left side of the display and the DTC is displayed in the right side of the display. By pressing the right AUTO button, the next DTC stored in memory will be displayed.

To erase: Only possible after all DTC's are read out. Simultaneously press both AUTO > 2 secs. "d" will be displayed in the left side of the display window and "FF" on the right side.
To cancel erase: By pressing AUTO the current faults will appear again.

Set temperature selector to normal setting.
Turn ignition OFF to end test.

DCT table:

B1226 - In-car temperature sensor (B10/4)
B1227 - Outside temperature indicator temperature sensor (B14)
B1228 - Heater core temperature (B10/1)
B1229 - Heater core temperature (B10/1)
B1230 - Evaporator temperature sensor (B10/6)
B1231 - ECT sensor (B11/4)
B1232 - Refrigerant pressure sensor (B12)
B1233 - Refrigerant temperature sensor (B12/1)
B1234 - Sun sensor (B32)
B1235 - Emissions sensor (B31)
B1241 - Refrigerant fill
B1416 - Coolant circulation pump (M13)
B1417 - Duovalve (Y21y1), left
B1418 - Duovalve (Y21y2), right
B1419 - Electromagnetic clutch (A9k1)
B1420 - Idle speed increase
B1421 - Pulse module (N65)
B1422 - Series interface (K1) connection to instrument cluster (A1)
B1423 - Switchover valve block (Y11)
B1424 - Activated charcoal filter actuator (A32m2) open
B1425 - Activated charcoal filter actuator (A32m2) closed
B1432 - Non-USA DTC
B1459 - Series interface (K2) connection to instrument cluster (A1)
B1462 - Wide open throttle (WOT) position signal: diesel engines


Could you please help me to unterstand what is the meaning of this error code?. I ran the DTC as mentioed.

Eb1 B22

Thanks
Husky
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post #4 of 150 (permalink) Old 05-03-2009, 05:35 PM
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Thanks Matt,

How about adding this thread to the stickys too?

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post #5 of 150 (permalink) Old 05-03-2009, 09:52 PM
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It should read B1822, but I could not find it, can you check again?

most codes explained for model >1996:
Attached Files
File Type: pdf Codes.pdf (68.2 KB, 6544 views)

Last edited by iluvjesus; 05-03-2009 at 09:57 PM.
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post #6 of 150 (permalink) Old 05-05-2009, 07:22 PM
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I am sorry. It is

Eb1 22

Thanks
Husky
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post #7 of 150 (permalink) Old 07-28-2009, 01:10 PM
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just ran the A/C diagnostic.. I was able to get the recirculation LED to blink but was not able to get the desplay to show the "di R" (I presume this is to get the computer to read the correct directory). With a blank screen only, i tapped the Right-side AUTO button one time and my displayed showed "E F F" could that possibly mean the whole system is in failure??

I state the system failure issue because, no air blows through any of the vents and it doesn't sound like there are any fan motors operating.

I believe I'm starting at the right place in the threads to get this fixed, am I??
Thanks
TPD
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post #8 of 150 (permalink) Old 07-28-2009, 07:31 PM
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Hi TPD welcome. EFF means no error codes. But it sounds like the blower/blower regulator is gone. You do have to remove this unit for jump test. Connect 12V to the motor (not the regulator) if it blows fine, then regulator gone. Of course check the fuses first. God bless and good luck.
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post #9 of 150 (permalink) Old 01-04-2010, 10:05 PM
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hi everyone, i tried to do the a/c diagnostics but i could only get as far as the blinking recirc light but nothing comes out on the screen, no di R. what could i be doing wrong?
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post #10 of 150 (permalink) Old 01-16-2010, 05:28 AM
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Quote:
Originally Posted by arvin0630 View Post
hi everyone, i tried to do the a/c diagnostics but i could only get as far as the blinking recirc light but nothing comes out on the screen, no di R. what could i be doing wrong?
Yours a 1996 W210? Does it have a LCD A/C display? If so, have you pressed the auto button after the ec blink.
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