Category Archive Mercedes r129 climate control reset


Mercedes r129 climate control reset

Apart from indicating more work to do, I began to wonder if I had disturbed anything when I had replaced the front springs or even earlier, the suspension top mounts. I went about my business on that day driving the car with the fault lights illuminated, they would pop straight on as soon as the key was turned and would not clear down on any number of engine re-starts. I had noticed disappointingly, that I had also lost 5th gear 5 speed version of the R with electronic control overdrive gear and also cruise control operation.

This underlined it was a speed signal fault but I would have to investigate further to narrow the field. This vehicle being the model SL it had the Mercedes proprietary diagnostic communication system, accessed from the 38 pin diagnostic socket inside the ECU box next to the bulkhead firewall.

You can read more about early MB diagnostic systems in this post. The first read of the ABS system revealed a recorded fault code with the rear left wheel speed sensor C Rear wheel sensor plausibility.

On removing the road wheel and checking the cable routing, all looked well. Often the older series of Bosch wheel speed sensors have a habit of collecting large amounts of iron debris on the sensing tip over time, causing impulse read issues at low speeds. I removed the sensor from its mounting hole on the rear hub carrier and inspected the tip.

It was not too bad and looked in good order. I had previously measured the sensors static resistance of ohms 1.

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A quick check to chassis ground, from either of the two sensor wires just proved that there is no chafing of cables to the vehicle chassis. It all looked electrically good, so investigations continued. The technique here is to remove the single hex cap head fixing from the sensor and spray penetrant all around the sensor. Push a screwdriver into the clearance hole of the sensor tab and begin to work it, levering very slightly to and fro, very carefully.

Continue application of penetrant. Eventually the sensor should be able to worked out from its hole. If you have not done so already, unclip the cable from the three snap clip mounting points behind the backplate to facilitate easy removal.

I shone a torch into the hole where the sensor is mounted to reveal the reluctor ring.

mercedes r129 climate control reset

Its purpose in conjunction with the sensor, is to provide measured impulses as the wheel rotates, each slot passing the sensor tip as it turns. This passing gap, steel, gap, steel and so on induces a small AC voltage in the sensor coil and this is passed in the form of electrical impulses, through its connecting cable to the ABS controller, allowing it to determine wheel speed.

I had noticed that the tone ring was in very good condition and the surface where it once was attached was clean and oil free. I could just see its inner edge as it passed the rear of the hub, so I selected Neutral and rotated the hub so the broken edges could be seen — they were clean and nothing was missing — just a straight, clean fracture. The gap in the split ring was forced closed, all but for less than half a millimetre gap.

Mixing up some quality epoxy two part adhesive, using a small screwdriver I built up the edge of the tone wheel to the CV joint body, pushing epoxy into the punched holes of the tone ring, then cleaning off the excess. Allowing this to dry hard at the repaired split section, the hub was rotated and further epoxy was applied to the complete circumference of the ring, filling in the slots, pushing and forcing the glue into the ring as I went.

Making sure I cleaned any excess that could interfere with the clearance between ring and sensor.Log in or Sign up. Mercedes-Benz Owners' Forums. This site uses cookies.

mercedes r129 climate control reset

By continuing to use this site, you are agreeing to our use of cookies. Learn More. AC Reset? Mine blows hot air out of the driver side vent next to the window all the time. On my old Scorpio, there was a process for resetting the CC by holding in combinations of buttons on the control panel that made the system open and close flaps etc and make sure everything was aligned.

Is the same possible on my car? I'd like to try that before I start looking at stuck flaps or broken actuators. Cheers, Bill. BillyBoyApr 24, Bill, I'm not sure on the w system, but this worked on my resetting the vents on my w - in the absence of other replies, it may or may not be of use: Press recirculated air and defrost buttons on control panel together for longer than 5 seconds. The LED's in the defrost and recirculated air buttons flash alternately.

Switch off ignition.

Mercedes Benz R129 SL CCC Climate Control Unit - 1991 SL500 -

After 40 sec re start engine. BillyBApr 25, That confused me - I thought I'd replied to my own post for a second when I saw the name! By defrost button, do you mean the one that is supposed to rapidly clear the front windscreen? BillyBoyApr 25, If the aircon lamp has been triggered, then only on STAR to reset it. The duo valve is a common fault, and they fail in the hot mode normally.

Well in true MB fashion, it has started working properly again! If it goes again, I'll check the windscreen vent too. Are Duo valve issues likely to be mechanical issues with the valve or control issues with the electronics?

You must log in or sign up to reply here. Show Ignored Content. Share This Page Tweet.As you are reading this you will probably be wishing to extract a fault code or clear a fault indicator lamp from the dashboard of your older Mercedes Benz model vehicle. Well the alternative information source you have been looking for is here, hopefully clear and accurate enough for your needs.

I have collected the following information together in one place to save the frustration of trying to locate and find most that you would ever need to tackle this job.

I will not repeat what has already been expertly written on this subject, you can find links below to these sources to expand on what I have noted here. All was needed was a paperclip or short banana plug jumper to ground the required pins and simply watch the number of flashes. Codes are resolved from comparison of flashes to fault codes on a written list.

This was commonly located within the ECU box and was accesses by removing a sealed access cap. The reason behind this was that MB at the time had to comply with export requirements that necessitated access to emission data through OBD standard protocols.

At this time Mercedes added the OBD port under the dash, in some cases near the steering column just to give access to emission related diagnostic codes, all the other electronic systems were dealt with through the 38 pin socket as before. So very much a hybrid situation was in existence — seemingly done as a quick fix to continue to sell cars in the US. Without going into too much detail this new system used ISO communication protocol to access the vehicle electronics via a common communications module.

This used both a K-line and L-line connection and Mercedes own communications language to access the system. Even though the communications standard of ISO is the same as used on OBD2 systems the way in which it talked to the modules was bespoke — and this is why you cannot use traditional OBD2 readers on systems of this type. Fortunately Mercedes saw the error of their ways and only ran with this for about a six year window opting to take on the OBD2 standard across the board from Thank goodness!

So given the above history there are three primary diagnostic code reading methods actually four that you may come across in the model year window of Please note all dates stated are approximate and for guidance only What is a little confusing is that Mercedes in their wisdom used the 38 pin diagnostic connector for both the analogue and digital systems making it very difficult to visually identify what system you are dealing with — they even used the same pin number allocations to reflect the connection to individual system components!

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Select your chosen test point module connection to test from the following 38 pin socket diagram and connection pin-out table. Turn ignition on, engine not running. Press momentary switch for seconds, wait and then count flashes. Note down the number of flashes on a piece of paper. Repeat the process until the first flashed code repeats. After reading a code, press the momentary switch for seconds then release.

Please note not all pins are loaded in every model, the quantity of available pins depends on model, version and fitted equipment. I have discovered that this period model The one I have! However that is about the extent of any function accessible by this method. As stated earlier above to read engine codes or ABS codes etc the unit has to be connected to a capable electronic code reader.

This is because the protocol or access language is specific to Mercedes. About the only system capable of reading and accessing the majority of codes through the Mercedes proprietary system is the Carsoft V12 system.

Air Conditioning & Vents

This is a Mercedes single model diagnostic tool made in Belgium. Its kit consists of a 7. For those fortunate to own post vehicles of the R stable your car should be equipped with a fully compliant OBD2 diagnostic system, 16 pin standard diagnostic port and the capability to be interrogated by most any off the shelf OBD2 reader. Lucky you! Instead of counting flashes, the AC console displayed fault codes on the two digit LCD temperature display and were cleared by a combination of pushing buttons.Here at Pelican, we can supply you with nearly every hose you might need to get your car's air conditioning blowing ice cold once again.

The Schrader valves on your car are used to add or release pressurized coolant from your car. They are similar to the common style of air valve commonly used on bicycles. All Search Everything. Brand Rating. Click for More Info. This site was designed and produced solely by Pelican Parts. Pelican Parts is not associated with Porsche Cars North America in any manner, except for a mutual appreciation and love of the cars. All pictures and references to the Porsche name, and the car names and shapes are for restoration reference only, and do not imply any association with Porsche.

Pelican Parts is not responsible for any typographical errors contained within the site. Information and technical articles within this website are for reference only. Consult authorized factory manuals when performing repair procedures. By entering this site, you agree to hold Pelican Parts free from any liability arising out of the use of any information contained within. Order Online or Call: Shopping Cart.

Browse Shipping Options. Project List. Order Status.Note: The online Owner's Manual is the latest version available. Deviations between this manual and items specific to your vehicle may occur since Mercedes-Benz constantly adapts its vehicles to the latest technology and modifies design and equipment.

mercedes r129 climate control reset

Please note that this online Owner's Manual does not under any circumstances replace the printed Owner's Manual which is supplied with the vehicle. The heating system is a heating and ventilation system, without a cooling system more. Air conditioning. The air-conditioning system is a combination of a heating and ventilation system, together with a cooling system more.

Rear-compartment heating. The separately activated rear-compartment heating allows a separate temperature and airflow setting for the rear compartment more. Rear-compartment air-conditioning system. The separately activated rear-compartment air conditioning allows a separate temperature and airflow setting for the rear compartment more. On vehicles without rear-compartment air conditioning, the control unit is equipped with a paper holder more.

The air-conditioning system regulates the temperature and humidity of the vehicle interior and filters undesired particles out of the air.

The system only functions optimally when the side windows are closed. The installed filter removes most dust particles, pollen and unpleasant odours drawn in from the outside air. A clogged filter reduces the airflow into the vehicle interior. The interval for replacing the filter depends on environmental influences. The interval may be shorter than that indicated in the Maintenance Booklet. In this way, you will accelerate the cooling process and achieve the desired temperature faster.

Observe the settings recommended on the following pages. Otherwise, the windows could mist up. This may obstruct your view of the traffic situation and, as a result, you may cause an accident. The vehicle can be equipped with an electrically-powered heater booster system.

The heater booster system ensures that the vehicle interior is heated up very quickly during the engine's warm-up phase. The heater booster system switches on automatically as required.Your Mercedes vehicle will flash a host of service lights to inform you when something might be damaged inside the car.

If the air conditioner unit is not running normally or is only blowing out warm air, it may be a temporary fault. Be aware that if you reset the unit and it again stops working, you need to take the vehicle in to the dealership for repairs. Insert the key into the Mercedes ignition and turn the ignition cylinder to the "2" position.

This is as far as the cylinder will go without cranking the engine. Press and hold the defrost and recirculated air buttons simultaneously. The defrost button has three lines going through it, while the recirculated air button has a picture of a car with a curved line through it. Hold these buttons down for about five to 10 seconds, or until the LED lights on both buttons start flashing. Wait 45 to 60 seconds for the LED lights to stop flashing. Then turn off the car.

This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

How to Test a Mercedes Benz Fan Blower Motor Regulator

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Insert the key into the Mercedes ignition and turn the ignition cylinder to the "2" position. Step 2 Press and hold the defrost and recirculated air buttons simultaneously.

Step 3 Wait 45 to 60 seconds for the LED lights to stop flashing. Wait 60 seconds and then start the car engine again. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.One of the most common complaints of Mercedes users is issues with the air conditioning system.

In many models, the AC keeps blowing hot air even after recharging the coolant. It is a frustrating problem, especially during the summer, when it is almost impossible to drive a car without the AC on. A Mercedes air conditioning reset is a possible solution.

Do you know how to do it? Is there any other way to fix the glitch? All Mercedes cars have a series of service lights that there is something wrong with an internal component or system.

However, there might not be any damage in the AC unit when it is blowing warm air or not running properly. It could be a temporary fault and a reset is likely to be enough to restore the normal function.

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Sometimes, the process is called a Mercedes climate control reset. The reset procedure is similar no matter whatever you call it. However, if the AC shows any trouble after resetting, you have to take it to a servicing shop or the dealership for a permanent fix.

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This is the highest point that the cylinder can go without activating the engine. Step 2 : Press the buttons for recirculating air and defrosting at the same time and hold them for somewhere between 5 to 10 seconds. To be on the safe side, hold them until their LED lights start flashing. Step 3 : Wait for about a minute for the LED lights to stop flashing. When they do, turn the car off. Wait one more minute before restarting the engine.

The AC system is reset now and the hot air blowing problem is likely to be solved.

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If a Mercedes air condition reset does not work, these following reasons could be causing the trouble:. When the AC is releasing hot air, the possible reason could be a defect in the damper.

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The component is in charge of the air path that goes into the cabin. A leak in the AC refrigerant is most likely the culprit when the blown air not hot but not cold either. It could also be a clogged AC fan blower motor. The first one could result in an expensive repair but fixing the second component is easier and less inexpensive. Tsukasa Azuma is an awesome car blogger of Car From Japan.

He owns a car repair shop at downtown Osaka, and he put all that experience to good use in his sharing posts. Login with Google. Likes Followers Followers. Import used cars directly from Japan. Maintenance Tips. By Tsukasa Azuma Last updated Oct 8, 0.

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Gardagar Posted on10:12 pm - Oct 2, 2012

das Requisit wird erhalten, welche jenes