One of the main problems is the Motorola CPU chip which fails, even the newer batch of EIS modules have the same processor fitted so fitting a new module won't solve the problem entirely. At this point, you would have been advised to purchase a new unit which can work out extremely expensive when working out the total bill with programming and labour inclusive with VAT. Some of the most common reasons are listed below:Īll of the above can cause memory loss to the EIS module and it cannot be repaired or re-flashed using the Mercedes STAR diagnostic system. It is very unfortunate but also a very common problem as there are many reasons as to why these units are failing - most are due to human error. This will stop the vehicle from starting. If the EIS unit becomes faulty, the 'Turn & Start' function will be de-activated and the module will be locked for security purposes. Incorrect programming by an incompetent garage/mechanic.Key sometimes doesn't turn in the Mercedes EIS.Key turns in the Mercedes EIS but the ignition lights on the instrument cluster doesn't switch on.
Mercedes EIS / EZS Immobiliser Key Module Problems You can expect the EIS module to be supported and installed on the following Chassis list: The EIS module is factory fitted to almost all models right across the board from C-Class C220 Mercedes to ML's and E350 Mercedes. Then and only then, when all three control units agree it is the correct authorised key being used, will it allow the 'Turn & Start' function to be activated. The ESL system will then look to see if the Engine ECU (Electronic Control Unit) agrees that this is the authorised key being used.
WHAT IS MODULE EZS IN MERCEDES VERIFICATION
Each time the key is inserted, the EIS system will check the key and then ask the ESL (Electronic Steering Lock) system for verification that it accepts the correct key is being used. The vehicle will instantaneously carry out a sequence of test handshakes to ensure the correct key has been inserted.
WHAT IS MODULE EZS IN MERCEDES CODE
The key has a sequential code to ensure the vehicle is not stolen. It is more like a plastic lego-brick with what looks like an infra-red panel at the face of it which is inserted into the EIS socket on the dash. The Mercedes EIS (Electronic Ignition Switch) system is great in theory, the hardware being the switch is like a small socket in the dash to insert your key into - only, it is not a traditional looking key. We can test your ignition module (EIS), Electronic Steering Lock (ESL) and your keys You insert the key in the ignition of your Mercedes but nothing hapens, You cant turn the key, or maybe you Can you hear a juddering noise from the Electronic Steering Lock (ESL)? Don't worry, we can help.
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