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1996 210.020
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Discussion Starter #1
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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All Sorts!
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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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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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2001 E320 - Brilliant Silver/Ash: 107,000+
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Thanks Matt,

How about adding this thread to the stickys too?
 

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210.065
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It should read B1822, but I could not find it, can you check again?

most codes explained for model >1996:
 

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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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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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1998 E300 TD, 200D
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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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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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not sure too, Matt will probably know.
 

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1996 210.020
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3,972 Posts
Discussion Starter #13
You need to connect it to a scanner such as SDS or Carsoft. You could have a bad control unit.
 

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2013 E350/41k, 1997 E320/290k, 1999 FJ100/256k
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314 Posts
I read these out today - thanks for the sticky!!!
got EB1234 and EB1459 - just captured video on my cell phone and review at the computer.. Took a bit to connect - the error like B1459 appears
as
Code:
Eb1            459
on the LCD
 

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i ran this test and got 231 which shows ECT sensor. I looked at the sensor readings and sensor 1 (in car temp) is always showing 261. My prob is the cold starts, the blower comes on full blast, doesn't wait for warm up. ??
 

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1999 E300 TD
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A possible reason for the high initial fan speed is that the AC control is seeing a very high in car temperature and therefore will adjust the fan accordingly. What is interesting is that you do not have a fault for a faulty in car temp sensor, which like you say is providing faulty temp data-----

The faulty ECT is an issue because the engine management system will default to temps stored in the engine conrol module. My point is that the defaults are not actual and therefore will have long term impacts on gas mileage and your AC control units ability to make quick temp adjustments.

I would clear all the faults and get the ECT changed. Then recheck the faults. Ding How!!
 

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1990 Mercedes-Benz 420 SEL(RIP),1997 Mercedes-Benz E420
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Hi I ran this test today and after looking through the DTC Codes

Eb1 419- Compressor Electromagnetic Clutch(A9k1)
Eb1 424- Activated Charcoal Filter Actuator (A32m2) : OPEN....what does this mean?
Eb1 239- I could not locate.

This is for a 97 E420 Dual Climate zones.

past problems with AC showed...
1. lots of hissing(vacuum leaks?)
2. cool air on pass. side not drivers(Vent far right and middle right vent, cold. No longer does this anymore, all warm)
3. Sometimes the middle vents will work and at others, nada.

I actually did a vacuum and recharge and they said the pressures were still good. After continuing with the service the AC blew cool again, unfortunately maybe a month later it blew warm again...
 

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1996 210.020
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Discussion Starter #19
The code for the electromagnetic clutch will shut you down completely. Can you rotate the compressor by hand?
 

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84 300SD (2 ea.), 98 E320 4matic Wagon, 51 Chev 1T pickup, assorted british motorcycles
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Does anyone on the list know which of the Real-time temperature values displayed on the control unit are C and which are F? I read Steve Brotherton's article which indicated that there are some of each. I get an evaporator temp of 38 on a 45 degree (F) day. If that's an F reading all's OK. If its a C reading then I would assume that the evap. temp. sensor's going or gone bad.

All functions appear normal to me but I've had the car only a month so I'm not sure. I do note that the blower comes on immmediately rather than waiting for water temp to come up as on my 126's.
 
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