Mercedes EIS / EZS Immobiliser Key Module – Recoding & Repair Service

Contact UsMercedes EIS ProblemsMercedes EIS (Electronic Ignition Switch) Modules
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. 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 key has a sequential code to ensure the vehicle is not stolen.

The vehicle will instantaneously carry out a sequence of test handshakes to ensure the correct key has been inserted. 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 ESL system will then look to see if the Engine ECU (Electronic Control Unit) agrees that this is the authorised key being used. – 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.

Which Model Mercedes Has The EIS Module
The EIS module is factory fitted to almost all models and we’re getting units sent in right across the board from C-Class C220 Mercedes to ML’s and E350 Mercedes. You can expect the EIS module to be supported and installed on the following Chassis list:

W208 / W210 / W203 / W209 / W211 / W215 / W219 / W220 / W230

Mercedes EIS / EZS Immobiliser Key Module Problems

  • Unable To Turn The ¬†Key
  • Unable To Start The Car
  • Can Turn The Key – But Car Won’t Start
  • Intermittent Ignition Key Faults

If the EIS unit becomes faulty, the “Turn & Start” function will be de-activated and the module will be locked for security purposes. This will stop the vehicle from starting. 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. Some of the most common reasons are listed below:

  • Jump Starting Whilst Key Is Inserted
  • Power Surge
  • Low Battery Voltage

All 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. 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.

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, it’s how you look after the vehicle which plays a big part.

Mercedes EIS Fault - Car Won't StartMercedes-Benz EIS / EZS (Electronic Ignition Switch) Module Repairs
We can remanufacture your existing EIS Module unit and save you a lot of money. We thoroughly test & repair all EIS modules to ensure we locate the faults and rectify them completely. When the unit is returned to you, you will not be required to reprogram or re-calibrate the unit – simply plug & play.

After we have repaired your EIS module, you will be able to insert the key, turn the key and start the vehicle with no troubles at all. We do however recommend that you check the battery supply voltage and wiring to the EIS unit prior to installation to ensure there are no faults on the vehicle which could potentially cause failure of the replacement / repaired unit.

All repaired EIS modules are returned with our full Lifetime warranty.
For more information, please call us on 0844 847 9999 or alternatively, send us an email.

Written by Jason

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70 thoughts on “Mercedes EIS / EZS Immobiliser Key Module – Recoding & Repair Service

  1. manaal

    malSir my Mercedese c220 cdi model 2011 is not getting start.The scanner is showing that there is malfunction in steering lock switch so what can I do for that.

    Reply
    1. Jason Post author

      Hello Manaal

      Thank you for your enquiry,

      We have sent you an email with full pricing and repair information.

      Kind Regards

      Jason
      SINSPEED

      Reply
  2. marcin

    hi guys my vito w639 wont start , key wont turn in barrel. column lock not working at all but is not locked, is it any think you can help with it …
    regards marcin

    Reply
    1. Jason Post author

      Hello Marcin

      Thank you for the enquiry,

      We can test & repair the EIS + ESL from this vehicle. I have sent over a quick email with full pricing and repair information.

      Kind Regards

      Jason
      SINSPEED

      Reply
        1. Jason Post author

          Hi Mike

          Thanks for the enquiry,

          Not to worry, we can definitely help!
          I’ve just sent you an email with full pricing and repair information for your EIS module. Send it over and we’ll test it first to make sure it is that at fault.

          Kind Regards

          Jason
          SINSPEED

          Reply
    1. Jason Post author

      Hi Paul

      Thanks for the enquiry,

      We’ve sent you full information and pricing on the repair to your Mercedes C220 2003 EIS module.

      Kind Regards

      Jason
      SINSPEED

      Reply
  3. Michael

    Hello my 05 Mercedes c230 ignition key won’t turn and remote won’t work anymore. Replaced with a new key fob also did not work. Can you pls send me a price for my EIM repair. Thanks.

    Reply
    1. Jason Post author

      Hi Michael

      Thanks for the enquiry,

      We can definitely test the EIS module for you and if required repair it at the same time. I have sent you an email with full repair information and pricing.

      Kind Regards

      Jason
      SINSPEED

      Reply
  4. Armands

    Hi, Jason!
    My w211 doesnt unlock sometimes by pressing the unlocking key. When driving sometimes all the warning lamps in the dashboard goes on and xenon lights restart. One guy diagnosed my car and and told me that eventually i will have to replace EIS. Is it really so? How much would this repair cost and how long should it take?

    Reply
    1. Jason Post author

      Hello Armands

      Thanks for the enquiry,

      If it is the EIS module causing this fault then it will require replacement or a repair. We can offer full testing and repair services at a much more affordable price than having it replaced and programmed. With our repair services you don’t need to worry about additional programming costs because the unit will stay coded to your vehicle.

      I have sent you a quick email with full information on the repairs and pricing.

      Kind Regards

      Jason
      SINSPEED

      Reply
  5. Tommy

    hi, I have a auto service shop in Canada, I am repairing a customer’s 2004 S430 with a problem in EIS that circuit 15 and 15R staying off even when engine is turned on which cause wiper, elec. seats , SRS not working , how much to repair the EIS

    Reply
    1. Jason Post author

      Hello Tommy

      Thanks for the enquiry,

      We’ve sent you an email with pricing and further information about our EIS and ESL testing and repair services.

      Kind Regards

      Jason
      SINSPEED

      Reply
  6. shaun

    hi I have a 51 w203 c200 komp and the key wont turn in the barrel.
    I would like to know how much to repair it? could you reply with an email cheers shaun

    Reply
    1. Jason Post author

      Hello Shaun

      Thanks for your enquiry,

      We’ve sent you over an email just now with full pricing and repair information.

      Kind Regards

      Jason
      SINSPEED

      Reply
  7. Alexandru Valentin Cazu

    Hi there. I have a mb c200 kompressor.. One of my keys it’s not working. Now I wander if you guys sell keys to that car, and if you do… Wander if it’s going to work? And the price. Thanks for your time.

    Reply
    1. Jason Post author

      Hello Alexandru

      Thanks for the enquiry,

      We can make a replacement key for you and match it to your EIS unit so no coding required from your side. I have sent you an email with full information.

      Kind Regards

      Jason
      SINSPEED

      Reply

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