Using parts from an old dismantled electrical transformer, I constructed a small coil on the end of an old small paint brush. Note the actual voltages as measured are completely arbitrary and are dependent on the number of turns wound on the Dummy Test Key coil. The easiest but extremely expensive solution is to replace the EIS with a new one. The problem is that there was a short circuit inside the Neiman EZS EIS (see attached photo) I repaired the fault, the neiman turns, the contact ignition is … About a week later, my car would not start and the same message appeared. The voltage drop across f78 seems reasonable. ... Lou and how does you compare 4matic system in W220 04-06 vs. Did you hear any signs of life whatsoever when you attempt to crank the engine. A keyless remote allows easy entry into your car. The exposed coil and connections were wrapped in masking tape and were inserted into an old empty key fob thus making a dummy test key. [3]. Of course it may be that it is not the actual chip that is sensitive to cold but one or more of the solder joints connecting the chip to the board may have developed hair line cracks which open when cold and close when warmed. When the record is created for a new vehicle, a set of unique key serial numbers is assigned and stored in FDOK. When you least expect it, running late on your way to a special event, you try turning the key again. Each key fob for this system contains an EEPROM chip that stores a fixed serial number and a rolling code. If key number 2 is lost again, the PDC will supply a key with the next unused key number, segment 1, and the technician will be instructed to disable key number 2 completely using a Hand Held Tester via the OBDII port and the vehilce’s CAN. My batteries are fine but my smart key can turn but will not start the engine. Functionality. The coil is connected to the two tabs at the left edge of the coil in the next figure. Be aware that in other cases it may not be the microprocessor chip shown in this article that fails but could be other components or even the solder joints themselves so some diagnosis as per the video will be necessary to thoroughly isolate the faulty component or item. Note the mechanical lock system in the EIS also prevents the Remote Control Key from being turned back to position 0 (Locked) and withdrawn from the EIS Ignition Lock unless the gear selector lever is in ‘P’ or Park. When the key is not recognised, the Inductive Power Supply reverts to zero output for about 30 seconds when it generates another short burst of AC power in an attempt to read the key. All Mercedes-Benz vehicles manufactured since about the year 2000 use a Drive Authorization System (DAS) to electronically validate the vehicle’s key. The next test aimed to measure the voltage induced in an actual Remote Control Key by the EIS once the key is inserted into the lock. When a new key is ordered, the PDC determines which key number and segment to supply based on whether the key is a replacement for a lost one or and additional spare key. If that does not work. Typical OEM as delivered vehicle with three keys per vehicle. Turns out it was an easy job for a RHD car (probably much easier than a LHD car) to remove the EIS. The induction coil connections were traced as far as possible. Step 2 A emergency mechanical key is stored inside the key fob and is provided in the event of this situation occurring. The valid key numbers and segments are programmed into the virgin ESL, EIS and ECM using a special green-colored workshop key. If you can’t even turn your car’s key to the “start” position, you can be certain that the problem is either the electrical system or the key itself. Further, Desert Oasis only uses OEM parts from Mercedes-Benz to perform a repair. This can happen if the EIS is damaged or if it does not recognize your key as valid. Check your owner’s manual. http://www.mbworld.org/forums/audio-...-pictures.html. It seems that the EIS Induction Power Generator output in the W220 was lower than the comparison vehicles. Once married to a key set, DAS will only recognize keys in that set. This is performed in different ways depending on which version of DAS the vehicle uses. For example, if key number 2 is lost, the technician orders a replacement for key number 2 and the PDC supplies key number 2, segment 2. It provides differential transmit and receive to the CAN-C (Engine) bus. Key Problems: If your Mercedes’ key fob has a dead (or dying) battery, it may not communicate properly with the Electrical Ignition System (EIS). You’ll have to get a dealer to help you with a key that isn’t recognized by the EIS. The ESL system will then look to see if the Engine ECU (Electronic Control Unit) agrees that this is the authorised key being used. steering wheel resumes it’s operating position (if this function has been previously activated). changed batteries in fob and changed the main battery twice. Key not recognized" on a 2005 W220 S600. If the spare works, the problem will be the key. Once cooled the key freezes in the lock and will not turn. If that one is not recognized either, you likely have a problem with the EIS ( electronic ignition switch ). I added a single piece of scrap transformer metal to the wooden cylinder to act as a core and bound both together with masking tape. If these sensors are damaged or disconnected, the car will refuse to start. In this event, all you’ll need to do is replace the battery. 1. See Electronic Ignition Switch (EIS) here [2]. The part numbers for the microprocessors in the EIS from a 2003 (Update) W220 S500L are: With thanks to BenzWorld Member pinkster, Dean these microprocessors are available for about US$30 posted from this source. If your Mercedes key has lost its remote function, such as unlocking doors or opening the trunk, the key’s own internal battery may be dead or dying. The Steering Wheel Comfort feature would not work. For all versions of DAS, there is no battery required for the key. I ground the end of the paint brush down to a cylinder of about 3mm diameter. If key number 2 is lost again, the technician again orders a replacement for key number 2 and the PDC supplies key number 2, segment 3, which disables key number 2, segment number 2. The mechanical rod which activates the Transmission Lock was also disconnected. The problem of Keyboard not working on your Windows Laptop might be related to minor software glitches. They are useful for comparison purposes only. When a Remote Control Key (or a finger for that matter) is inserted in the electronic ignition switch (EIS or EZS) control unit (ignition lock) (N73), it operates a switch which activates an AC generator inside the ignition lock. Also, since there is no mechanical blade to unlock the ignition switch, the release of both the ignition switch and the steering column lock is performed electronically once DAS validate the key through the infrared data exchange. (08-18-2018, 03:02 PM) momoauto Wrote: Hello I have a mercedes W210 E270 CDI who does not want to start! Your key won’t unlock the car, and won’t start the car. The first step was to remove the Glove Box so that the two nuts securing the Burred Walnut strip across the dash could be removed. Key works in the. Here are some of the internal components of the IES and their functions. Of course this is not a permanent fix but may get you out of immediate trouble. Hi i have a 2001 Mercedes S500. This might have happened to you. Key not recognized" on a 2005 W220 S600. In order to investigate the performance of the Induction Power Generator the author decided to measure the AC signal produced by the ignition lock (Electronic Ignition/Starter Switch (EIS) control module (N73)). The DVM readings were not analysed. IR322A is a hexfet power mosfet in a TO252-AA case. If an additional spare key is requested, then the PDC will create it as the next unused key number, segment 1. The Remote Control Key (A8/1) emits radio frequency (RF) (In Australia 315 MHz) frequency modulated (FM) signals to operate the remote control functions of unlocking, locking, and boot/trunk opening. Power OFF your computer.. 2. Damage, neglect, or even ordinary wear and tear in any of the parts named above can jam your Mercedes’ ignition, rendering it impossible to start the car. The voltage drop across f78/7.5A (FB Cockpit Left (RHD)) was measured with the key out, and key in. There were 88 differences between the old and the replacement unit. 1. He was advised by his Indie that the US uses the same key frequency as Australia and hence the USA sourced EIS would be compatible with the Australian standards. The four main components of the Remote Control Key (A8/1) are the key fob case, electronic printed circuit board, the battery holder with fob lid and with two 3V CR2025 button type batteries, and the emergency mechanical key. If your key will not lock and unlock the car from 10m (30ft) or more, your batteries are weak and that will compromise the strength of the infrared (IR) beam. It is now apparent, thanks to several BenzWorld Members and especially YouTube Poster John Kennedy, that one of the microprocessor chips on the EIS becomes sensitive to cold temperatures. Authorized PDC’s stock virgin key transponders and have special equipment to program them with valid serial numbers from FDOK. This video instruction is suitable for Car Key Master: CKM-100(PC Version) and CKM-200(Handhold Version), also it is suitable for Digimaster 3. While these systems deliver a flawless performance in good working order, they can cause severe problems when they fail. When the key is not recognised, the Inductive Power Supply reverts to zero output for about 30 seconds when it generates another short burst of AC power in an attempt to read the key. car has been pulled up in the yard on level ground. The odometer reading of the new unit was incorrect and unfortunately was higher than the original. The frozen key often happens intermittently causing huge frustration when out travelling. If these batteries are weak or flat, the key will not unlock the doors or boot/trunk. Even though not all keys physically exist, all possible key ID’s for that vehicle are loaded. This type of test is a ‘fully loaded’ test, ie the internal coil is connected to it’s normal circuits and thus any induced voltage will produce current and activate the circuits. Normally after inserting the correct Remote Control Key in the ignition lock (Electronic Ignition/Starter Switch (EIS) control module (N73)) it will turn instantly to position 1 (accessories), 2 (ignition on) and position 3 (engine start). It could be the car battery. The problem is that the car does not recognize the key. The steering wheel will feel completely solid if you try to move it in one direction and may move slightly in the opposite direction. It is infuriating to slide behind the wheel, turn the key, see dash lights blink, but the engine won’t turn over. The Dummy Test Key also provided useful comparison results between similar vintage Mercedes vehicles, albeit not exactly the same model. These previous Dummy Test Key tests were ‘open circuit’ tests, ie the coil had no load connected to it and any induced voltage thus produced no current. As delivered, the vehicle will have two keys using key number 1, segment 1 and key number 2, segment 1 (some models were delivered with three keys, the third one using key number 3, segment number 1). It is presumed that the EIS warms up slightly during this process. Better range is achieved if the receiving door handle is not in direct sunlight. The tests conducted with the Dummy Test Key were useful to establish that the EIS was producing an AC frequency in the Induction Power Supply and that it was being inductively coupled into a Remote Control Key once inserted into the lock. Comparison of W204 C220 (Left) and W220 S500L (Right) with CRO on Same Scale. Could you turn the ignition key all the way to the start position? Take note: The fuse number will depend on the model of Mercedes-Benz that you have. Try changing the batteries in the key before you go to more complicated (and expensive) efforts at restoring the function. The AC voltage produced in the coil is rectified and the resulting DC voltage is used to power the Remote Control Key ignition functions. ME-SFI control unit (N3/10) (with gasoline engine). The car may not start if you have a newer car with a SmartKey due to Driver Authorization System (DAS) failure. For later vehicles, the transfer of data between the EIS and the fob’s EEPROM is performed via an infrared signal. Typical OEM as delivered vehicle with two keys per vehicle. which are associated with this particular key are initiated (if this function has been previously activated). Here are the pin diagrams for the connectors. 3 - Replacement EIS via eBay, DIY Solution No. Surface mount electronic components can be very sensitive to excess heat and static electricity. secondary electrical systems but not enough juice to turn the car’s starter motor. Then the Walnut strip was removed making it easier to extract the Instrument Cluster. The key fob remote serves two purposes. After a second attempt whereby both "EPROMs were cloned" the new unit is working the same as the original but with no cold start problem. 4 - "The Ultimate EIS Repair Guide", http://mhhauto.com/Thread-The-ultimate-Mercedes-EIS-repair-guide, https://w220.ee/index.php?title=WIS_80.57_Drive_Authorization_System&oldid=3884. Additional Keys - Drive Authorization System, Everything you ever wanted to know about the Drive Authorisation System (DAS), EIS and Keys, How It Works - Remote Control Key and EIS, Part Numbers - Remote Control Key Fob Batteries, How To Change Batteries - Remote Control Key Fob, Electronic Ignition/Starter Switch (EIS or EZS) Control Module (N73), Common Issue - Remote Control Key Will Not Rotate/Work/Turn in EIS (EZS), Temporary Solution for Issue - Remote Control Key Will Not Rotate/Work/Turn in EIS (EZS), Possible Failure Mechanism for Issue - Remote Control Key Will Not Rotate/Work/Turn in EIS (EZS), Investigation of Issue - Remote Control Key Will Not Rotate/Work/Turn in EIS (EZS), DIY Testing EIS Induction Power Generator Output, Comparison of Test Results for W204 C220, W211 E320, W209 CLK200K and W220 S500L, Test of Induced Voltages In Actual OEM Remote Control Key, DIY Solution No. The vehicle cannot be started while the key will not turn. This is electronic key maam. See Instrument Cluster Repair Tool Kit here [1]. Warming this particular chip temporarily solves the problem until it cools down sufficiently again. Mechanic's Assistant: Is the key stripped or worn? I have been getting a message "key not detected" while driving and when I try to start the car. Basically for each key number, there are three key segments. If this is successful in getting the engine to start, you’ll know your issue is with the battery. Mercedes ZGW Gateway control module stores data for Mercedes ASSIST or ASSYST plus. Locating a faulty sensor requires that advanced diagnostic equipment that we use in our shop. The AC voltage produced in the coil in my Dummy Test Key by the EIS Induction Power Generator was measured with a Digital Volt Meter (DVM) and a Cathode Ray Oscilloscope (CRO) in several M-B vehicles including my W220 S500L. Each time the key is used in the ignition switch, DAS reads both the fixed serial number and the rolling code. The PDC will create the replacement with the next unused segment number for that same key number. The CRO Scale was: 1V/division with 10x Probe = 10V/division and 5µs/division. Using a separate inductive power supply very cleverly avoids reliance on the Remote Control Key batteries and ensures the Remote Control Key will operate the ignition even if it has internal flat or weak batteries. EIS Problems: If the ignition system itself is to blame, it may have intentionally locked down your car’s engine to prevent theft. Every Mercedes-Benz vehicle has a record in FDOK (M-B’s worldwide database that contains all information about every M-B ever built), including the assignment of all electronic key codes for all vehicles using DAS. I wound approximately a thousand turns of 1.1mm diameter enamel insulated copper wire onto the former and soldered some insulated flexible wires for the test connections. TJA1054 is a 14 pin Philips Fault-tolerant CAN Transceiver. Sensor Problems: There are multiple components attached to your car’s electrical system that are also connected to the ignition security system. MHH Auto senior member 'bawarek' has posted an excellent although very technical article titled, "The ultimate Mercedes EIS repair guide". If you have a different model, you will have to use fuse numbers assigned to your COMAND, CD changer, radio and audio gateway. That is there is no need for chip swapping. Matching rear view showing fixed connectors. There is a warning message on the screen saying "Chip Card Not Recognized" even though I … read more Only a factory or an authorized service center can order keys. If the key does not turn in the ignition, try moving the steering wheel as you try to turn the key. It requires some very careful and fiddly soldering and should only be undertaken by someone with considerable electronic experience. It was thought that this could be a high resistance in the fuses, fuse connections or cable connectors in the appropriate EIS supply lines or it could also be due to a faulty voltage regulator in the supply to the EIS Induction Power Generator circuit. This time, you have enough power to activate accessories like the interior lights, the windshield wipers, and the windows but still no engine. I like to deal with Michael Warfield or another "Factory trained" MB tech or NB shop foreman that works on these cars daily and is detail oriented.. As explained previously the EIS generates a 118KHz sine wave which is inductively picked up in a small coil in the tip of the Remote Control Key fob. the steering wheel is locked to the left and moves lightly the other direction. PCA82C250 is a 8 pin Philips Can Controller Interface. If the identification of the transmitter key (A8/1) is valid, the rotary lock of the EIS control unit (N73) is enabled. It’s time constant is many minutes, ie it holds the voltage charge and powers the key electronics long after the EIS has stopped generating the AC frequency. 42760V5 is a 5 pin 5V Regulator in a TO252-5 case. Press a finger on the "lock" button of your key fob while the key is in the Mercedes' ignition. If the key will not turn in the ignition lock it is NOT caused by weak batteries in the key as the key electronics are powered inductively from the EIS Control Module when inserted into the ignition. This became the former for the coil and provided a nice winding surface. The Remote Control Key Fob functions may be affected by weak batteries in the key. It will cost over $3,000 and requires reprogramming of the new EIS to match the vehicle. The power for the DAS functions comes from an electronic coil mounted in the ignition switch housing that supplies inductive current to the circuitry in the key fob. The Dummy Test Key induced coil voltages as measured by the CRO were very stable and consistent. If you have backup ignition keys, give them a try. The newer keys have a transponder integrated in them. I have SDS print out. Australian BenzWorld Member iSteve reported that he purchased a replacement EIS with the same part number as his on eBay from the USA. Also be aware that working with electronic components requires some specialized skills such as fine soldering technique and appropriate earthing techniques to aid in prevention of electrostatic discharge. Information gathered from various official MBZ sources, included technical documentation, service documents, and even authorized technicians and factory personnel, by BenzWorld Member rudeney. Step 9: Driver Authorization System / Key won’t turn in igntion. The same is true whether your key fob is brand new or has been in use for a while. DVM Reading Dummy Test Key AC Output in W220 S500L, CRO Reading Dummy Test Key AC Output in W220 S500L, CRO Scale: 1V/division with 10x Probe = 10V/division and 5µs/division. Initially the Indie only "cloned" one EPROM which resulted in some errors such as; iSteve reported that his Indie used an In Circuit Serial Programming (ICSP) cloning tool and a laptop which allowed programming a microprocessor chip while it is still attached to the application circuit. This page was last edited on 12 June 2016, at 10:40. The capacitor has a value of 47μF 10V and is used to store the DC voltage produced. If a match is found, the ECM will allow the engine to start and run, and DAS will write a new “randomized” rolling code to the key fob’s EEPROM. A DIY fix for this is available below. On line parts supplier Genuine Auto Parts will sell an EIS to the public for about AU$625 and Mercedes-Benz will supply a green (workshop) key with a AU$500 deposit, refunded on return of the key. Examining the customer’s photo ID and the vehicle’s registration receipt generally satisfies this. When inserted into the slots on each side of the Instrument Cluster they release plastic retaining clips. Start-up is enabled only after the transmitter key (A8/1) is identified by the encrypted data exchange between the. The tab at the right end of the coil is not connected and is just for fastening that end of the coil. (There are two of these in my EIS.) Take out the key from the ignition and don’t turn on the car for at least 15 minutes. Fixing problems with your Mercedes’ sensor suite is a repair for Desert Oasis Auto Repair. The link shows one investigation with the bottom line that it was not a DIY solution. 1. The ICSP tool was used to save the original Hex files and copy them over to the replacement EPROMs. When the replacement key is first used in the vehicle, DAS will disable the use of the key using the same key number and the previous segment. I tried both keys and neither worked. How the Remote Control Key Works in a W220, Testing EIS Induction Power Generator Output, The 64-pin quad flat pack (QFP) microprocessor at the. Warming the culprit chip, just with applied finger warmth for a few seconds, solves the issue and the key will turn again. This generator produces a high frequency (118KHz) sine wave which is inductively coupled to a small coil in the tip of the key fob. Do not turn on the vehicle. (I could not find a pin configuration diagram identifying pin functions.). . The two internal batteries in the key fob are used to power the IR emitter for this function. The components that you’ll be focusing on here are your car’s keys, its electronic ignition system (EIS), the battery, and some of the sensors connected to the electrical system. I was told if that is not it, it may be in the ignition. If a replacement key is requested, the technician must determine which key number was lost and order its replacement. Even if that lost key is found, it will no longer operate the vehicle. The voltage drops across X4/10 f2/60A and connectors Z4/3 and W36/2 were not measured. If your keys have an infrared connection (check your owner’s manual) you may be able to fix the problem yourself. It provides differential transmit and receive to the CAN-B (Interior) bus. To determine whether or not your problem is with the battery — without going to the expense of buying a brand new one — use another car to jump start your Mercedes. See http://mhhauto.com/Thread-The-ultimate-Mercedes-EIS-repair-guide. The battery in the key fob is used only to power the Remote Control Locking (RCL) functions. The EIS bezel is easily unscrewed using a special tool. I have a 2017 GLA250 Mercedes with about 10,000 miles. This video instruction is suitable for Car Key Master: CKM-100(PC Version) and CKM-200(Handhold Version), also it is suitable for Digimaster 3. Mercedes-Benz Central Gateway Module ZGS (also referred to as CGW) may fail, causing various warning lights or systems to stop working. See below for solutions to malfunctioning EIS. changed key fob shell … car was parked on incline next morning key switch would not turn. It is a more meaningful test but more difficult to execute. These were not needed anyway. Once powered by the Induction Power Generator the Remote Control Key emits IR signals to, and receives IR signals from, the Drive Authorisation System (DAS) in the Electronic Ignition/Starter Switch (EIS) control module (N73). When a key is used that is recognised by the EIS, the Inductive Power Supply operates continuously until the key is removed. The Remote Control Key also emits infra red (IR) signals to operate the convenience opening and closing feature. Despite this brand’s high quality, though, Mercedes’ can develop problems with or without regular car maintenance. For new factory vehicles, there is an operation that performs the initial programming of DAS to introduce it to its assigned key set. Key does not This microchip was very sensitive to cold temperature, shown here being cooled with a can of freezer solution. I took bot keys to the dealer to have them checked and new batteries put in them. This can happen if the EIS is damaged or if it does not recognize your key as valid. In many Mercedes models, a relatively minor problem that occurs in its electrical system disables the entire. DAS has a maximum of 24 keys per vehicle, however only 8 can be active at a time. Wait for 2 minutes and Restart your computer.. You might be pleasantly surprised see the Keyboard of your Laptop magically back to its working condition. The W220 Induction Power Generator output is only about 71% when compared to three other equal vintage Mercedes Benz vehicles. You might have a issue with the keyless go system or your EIS ( electronic ignition switch) For sure try what Auto Centric recommends to check the starter battery but i dont think a starter battery will give you a No Key Detected message. ), http://www.benzworld.org/forums/w220-s-class/1300215-cold-weather-electronic-key-problems-5.html. To try to determine exactly what determined the lower voltage the following tests were carried out. The transmitter key (A8/1) can now be turned. If you are lucky it may eventually start working again after continually trying and waiting twenty minutes. I did not establish how many times it continues to do this before cancelling. Mercedes Central Gateway module is the hub that allows communication between various modules. Note that RCL functions are tied to DAS so no additional programming is necessary to completely disable the remote locking/unlocking ability of a lost key. 2 - Replacing EIS Microprocessors, DIY Solution No. Some tracks disappear under surface mount components, and the coil is connected to a diode and what I suspect is a zener diode resulting in a roughly regulated half wave DC power supply. Check Remote. Keys are programmed when a key set is ordered for a new vehicle or an additional or replacement key is ordered for an existing vehicle. Key works in the ignition, push start doesn't work. The IR signals are received by either IR sensor built into the two front door handles. (The crankshaft position sensor is one example.) Was lost and order its replacement induced coil voltages as measured by the EIS warms slightly..., DIY Solution no a 5 pin 5V Regulator in a TO252-AA case cases, dying! 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In igntion weak batteries in your key as valid previously activated ) to fix the problem until it down! ) have access to this information DAS as defined in FDOK replacement key is,. Both the fixed serial number and a rolling code authorized PDC’s stock virgin transponders. Lost and order its replacement vehicle’s registration receipt generally satisfies this 3 replacement! It seems that the key out, and key in the vehicle, this coil is rectified the... Not measured CANBUS to SAM replacement EIS with the same at 7.60V 7.50V... When it comes to a key set have a problem with the figure. Ensure you have a newer car with a new one if an spare... Dealer only option any more EIS and ECM using a special green-colored workshop key of DAS the vehicle to.! Rhd car ( probably much easier than a LHD car ) to communicate.! It has been previously activated ) permanent fix but may get you out of immediate trouble Fault-tolerant can.... 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