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Air Conditioning - EC light

Discussion in 'General Mercedes-Benz Related Discussion' started by Lewis, Dec 22, 2008.

  1. Lewis

    Lewis Active Member

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    I've just had my air con recharged after the EC light came on last week and would not go off to allow the air con to operate. The air con recharge machine printout confirmed a recharge was required however even though the air con is now ice cold (not that you need it this time of year) the EC light will not go off unless i do the following.

    Turn the ignition on and the EC light appears and wont switch off.

    If i turn the ignition off then back on again the EC light will switch on and off OK.
    Is there a reset i need to do ?

    My car is a 2000 CLK55 AMG W208.

    Thanks
     
  2. television

    television Always remembered RIP

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    Yes you do have to have it turned on in STAR, once the EC light is on you cant turn it off without STAR.

    I had the same thing,,Quickfit charged it for me but did not charge is it did not work,,had it turned on and all is fine,, using them made a cheap fix
     
  3. OP
    Lewis

    Lewis Active Member

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    Many thanks. I too used quick fit the weekend, only £25 this time of year so worth topping up to those that are thinking of leaving it until the warm weather arrives.
    I wont bother trying a reset through the climate control unit then.
    The air con works fine but its just annoying that i have to switch the ignition to position 2 twice before starting the car so i can turn the EC light off to make the air con work.
    I'll have a chat with the local STAR equiped garage to see whats involved to carry out the reset.
     
  4. OP
    Lewis

    Lewis Active Member

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    Update - after trawling the net to see if there was anyway of resetting the EC light I found it. STAR not needed to cure the reset I required as all I needed to do was delete the fault codes stored in the Climate control unit.
    If anyone would like instructions on how to erase codes I can post them on here.
     
  5. television

    television Always remembered RIP

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    Yes, why not put them up
     
  6. OP
    Lewis

    Lewis Active Member

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    OK.

    Sensor Data.
    First we’ll get the values of all the various climate control sensors. These sensors constantly monitor data like air temperature, refrigerant pressure, etc. Odds are if something’s wrong, a sensor will pick it up. Let’s get started!
    • Start your car.
    • Press the “AUTO” button on your climate control.
    • Turn on the A/C (i.e. “EC” light must be off; if the light won’t shut off, continue with this test. We’ll address your “EC” light on the next page.)
    • Let the car idle for about 3 minutes.
    • Set the temperature on each side to 72°F. You can do this quickly by pressing both the red and blue arrows simultaneously.
    • Press and hold the “REST” button for five seconds or until the left side of the display says “01.” The left side indicates which sensor you’re checking. In this case, #1 is the in-car temperature sensor. The right side of the display shows the value of sensor #1 (in this case, the actual in-car temperature).
    • Press the “AUTO” button on the left side to move to the next sensor. Press the “AUTO” button on the right side to move to the previous sensor.
    • Record the ID number of each sensor (left side of display) and its corresponding value (right side of display). For example, in the picture on the right, you would record that sensor #5 has a value of 6.
    o You only need to do this for sensors #1-8. You can write down the values for the other sensors, but they’re not really related to air conditioning function.
    When you are done, press the “REST” button again to exit the self-check mode.

    Sensor codes.
    01 In-car temperature sensor.
    02 Outside temperature sensor.
    03 Heater core temp, left.
    04 Heater core temp, right.
    05 Evaporator temperature sensor.
    06 Engine coolant temperature.
    07 Regrigerant pressure in bar (e.g. '4' is 4 bar).
    08 Refrigerant temperature.
    09 Not used.
    10 Heater blower control voltage (normal 08-6.0, meaning .8 to 6 volts).
    11 Emissions sensor voltage (to detect atmospheric gases and recirculate interior air).
    12 Sun sensor voltage (to shift airflow in car).
    20 Control current for auxilliary fan (electric fan on radiator, given in milliamps or mA).
    21 Engine speed (x100).
    22 Road speed (km/h or mph depending on installation).
    23 Battery voltage at terminal 58d (as a percentage of total voltage, e.g. 99.0 = 99%).
    24 Battery voltage (e.g. 12.8 = 12.8V).
    40 Climate control software version.
    41 Climate control hardware version



    Malfunction codes.
    Now that we have all the sensor values, let’s check the computer for malfunction codes. Read this carefully, because you have a 20 second window after switching on the ignition to load the trouble code display mode.
    • Ignition must be switched on. 20 second timer starts.
    • Increase the left side temperature (left red arrow) until left side says “HI.”
    • Decrease the right side temperature (right cold arrow) until right side says “LO.”
    • If your 20 seconds passed, switch off the ignition and switch it back on. Your HI/LO settings will be preset. Timer restarts.
    • Press and hold the “EC” and “REST” buttons simultaneously for at least five seconds.
    • The screen will go blank.
    • Load the first code by pressing the right side “AUTO” button.
    • If you have any error codes in memory, the screen should look like the figure on the right. The ‘E’ stands for “error.” In this case, we have error code B1234.
    • Write down each error code. To cycle through the codes, press the right side “AUTO” button.
    • When you finish, press the “REST” button to exit.

    Deleting the fault codes.
    Service Procedure:
    1. Read and clear DTCs in the A/C control module using a push-button on-board procedure. Turn the key to the ignition “ON” position.
    2. Set the left temperature selector on “HI” and the right temperature selector on “LO.”
    3. Within 10 seconds, press and hold the “REST” and “EC” buttons simultaneously for six seconds, then release.
    4. The Light Emitting Diode (LED) in the recirculation button should begin to blink. The display should read “di A.”
    5. Press the right “Auto” button to display DTCs. Keep scrolling through the list by pressing the right “Auto” button until the display shows “E FF.”
    6. To erase DTCs, press and hold both “Auto” buttons simultaneously for three seconds and release. The display should show “D FF.” Switch off the ignition.
    7. Restart the engine. If the “EC” button lamp is illuminated, press and release the “EC” button. The lamp should go out. If not, recheck for DTCs Key On Engine Off (KOEO), then recheck compressor operation.



    The following are where I found the fault codes listed relating to the Air Con.

    Body
    B1000 HRA Headlamp range adjustment: Supply voltage of the control unit is too low (undervoltage)
    B1004 LCP Lower Control Panel: Control unit does not match vehicle type
    B1056 Automatic Air Conditioning: Problem in CAN communication with control unit DCM-RL
    B1201 Electric seat adjustment front left: Hall sensor front height
    M27m3
    B1213 If seat memory installed: ext left rearview mirror voltage faulty
    B1214 If seat memory installed: ext right rearview mirror voltage faulty
    B1226 In-car temperature sensor (B10/4)
    B1227 Outside temperature indicator temp sensor (014)
    B1128 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
    B1246 PTS Parktronic: A42b1 (left outer sensor, front bumper) The plug connection has poor contact or is loose, or the sensor or cable is faulty
    B1310 Left/Window airbag sensor is defective
    B1315 Problem in Front passenger child seat recognition
    B1416 Coolant circulation pump (M13)
    B1417 Duovalve (Y21y1), left
    B1418 Duovalve (Y21y2), right
    B1419 Electromagnetic clutch (A9k1)
    B1420 Idle speed increase
    B1421 Pulse module (N05)
    B1422 Series interface (K1) connection to instrument cluster (A1)
    B1423 Switchover valve block (Y11)
    B1424 Activated charcoal filler actuator (A32m2) open
    B1425 Activated charcoal filler 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
    B1476 Airbag malfunction indicator and warning lamp is defective
    B1481 HRA: Part E2m1 (Right headlamp range adjustment motor) has short to ground
    B1489 HRA: Part E2m1 (Right headlamp range adjustment motor) has open or short to positive
    B1492 HRA: Part E1m1 (Left headlamp range adjustement motor) has
    short to positive
    B1617 Part E19/1 (Left license plate lamp) is defective
    B1618 Part E19/2 (Right license plate lamp) is defective
    B1628 Part E2e5 (Turn signal lamp) in module E2 (Right front headlamp unit) is defective.
    B1703 Intermittant No Start in AAM Immobiliser Module
    B1729 PSE Pneumatic system doorlock Control Module A37
    B1736 Navigation system's CD Player: Check General CD, Check CD data block, Flimsy CD data
    B1768 Faulty open data flap limit switch (0025) Front flap
    B1773 HRA: Zero position programming has not yet been carried out or is not possible
    B1850 Electric seat adjustment front right: CAN communication interrupted with DCM
    le Security Control Module

    Hope someone may find this useful.
     
  7. television

    television Always remembered RIP

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    I think that they will:D and thank you
     
  8. nightrider

    nightrider New Member

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    Turn off EC light 97 E320

    I had a new compressor instaled and freon add in my 97 E320 how can I reset my EC light myself without having to pay a MB mechanic $175 to do it for me
    Thanks Nightrider
     
  9. nightrider

    nightrider New Member

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    I had a new compressor instaled and freon add in my 97 E320 how can I reset my EC light myself without having to pay a MB mechanic $175 to do it for me
    Thanks Nightrider
     
  10. television

    television Always remembered RIP

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    Got to be someone that has a STAR tool, do you have any indies where you are
     
  11. dobo

    dobo Member

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    really would like instructions on how to get those codes and how to erase them. I have the following but they dont seem to work.
    a) Switch ignition on
    b) set left AC/heater temp to H
    c) set right AC/heater control to LO
    d)Depress Rest and EC switches simutaneously within 20 seconds of switching on
    e) hold REST and EC for more than five seconds
    f) Air recirculation lamp flashes
    AND THIS IS WHERE IT GOES WRONG
    display is supossed to say Di A but mine comes up E : FF
    which means no codes can be viewed
     
  12. SEE43AMG

    SEE43AMG New Registration

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    Ec button reset

    Yes please! Help
     
  13. suzemiss

    suzemiss New Registration

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    Mobile Air Conditioning

    Mobile Air Conditioning Services specialises in the installation and service of commercial air conditioning systems for all types of earthmoving and mining equipment, bus/coaches and trucks.
     
  14. Mark Somerset

    Mark Somerset New Member

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    Used Lewis's method for resetting the EC light on my 230CLK, instructions looked complicated to start with but worked my way through them in no time at all now every time I start the engine the EC light is off, fantastic, thanks Lewis.
     
  15. coolhans

    coolhans Senior Member

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    Lewis's post is very good. This is the forum at it's best Thank you.
     
  16. OP
    Lewis

    Lewis Active Member

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    Very satisfying to hear. Feels great when you can use this forum to fix something yourself.
    Cheers
     
  17. mindar2020

    mindar2020 New Member

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    Wicked, looks like this has sorted the turn ignition on and off senario! Climate control is back to normal, many thanks.
     
  18. Isonnybox

    Isonnybox New Registration

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    How did you do it? thank you
     
  19. Naraic

    Naraic Moderator

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    Read on after that post (from 3 years ago)...its all there.
     
  20. andy_yzf

    andy_yzf New Registration

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    Switching of EC light with single zone control

    Hi

    I have an SL320 - 97 with single zone control on the panel. How do I go about resetting my EC light.
    Re-gassed at the weekend and cannot find a link to reset with a single zone unit ?

    thanks

    Andy
     

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