Mercedes EIS EZS + ESL | Ignition Switch Module Repair

Mercedes EIS common faults

  • Unable To Turn The  Key

  • Unable To Start The Car

  • Unable To Unlock Steering Lock

  • Can Turn The Key – But Car Won’t Start

  • Intermittent Ignition Key Faults

  • Won’t Start When Cold

Failure of EZS system

  • Jump Starting while key insterted

  • Power Surge

  • Low Battery Voltage 

  • Corrosion 

  • Faulty chip

 

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.

‚Äč

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:

Re-manufacture Ignition module

  • We are able repair 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. 

  • After your EIS module has been repaired , you will be able to insert the key, turn  and start the vehicle with no problems whatsoever. Before plug the EZS back we always making sure there are all prerequisites are made regards the right power supply.

Mercedes EIS/EZS electronic system is like vehicle heart (Electronic Ignition Switch) but sometimes fails making big trouble for us. 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.

Supported models

W164 / W168 / W169 / W202 / W203 / W204 / W208 / W209 / W210 / W211 / W212 / W215 / W219 / W220 / W221 / W230 / W639

Supported part numbers

1695452308

1695450708

1695450708

1695451308

1695451908

1695451108

2035450608

2035450508

2035450308

2155450208

2155450008

2115451008

2115451408

2115450608

2115453108

2115452308

2115451048

2205450008

2205450908

2205450308

2205450708

2155450808

2085450108

2095451908

2095452308

2095453408

2095453308

2095451308

2095451808

2095450908

2095450508

2095451908

9065453008

2105450108

2105450008

2105450208

2105450308

2129055000

2215451108

2215451308

2215450508

2215450308

2215451208

2469055801

2469054702

1645450908

6395450508

6395450108

6395450608

6399002201

9065453008

9069003901

9065454008

9069004200

9069050600

9069003901

9065453008

164 545 09 08

169 545 15 08

169 545 23 08

169 545 19 08

169 545 07 08

169 545 07 08

169 545 11 08

203 545 03 08

203 545 06 08

203 545 05 08

208 545 01 08

209 545 19 08

209 545 23 08

209 545 34 08

209 545 13 08

209 545 18 08

209 545 09 08

209 545 17 08

209 545 05 08

209 545 19 08

209 545 33 08

210 545 02 08

210 545 00 08

210 545 01 08

210 545 03 08

211 545 10 08

211 545 31 08

211 545 10 48

211 545 14 08

211 545 06 08

211 545 23 08

211 545 24 08

212 905 50 00

215 545 08 08

215 545 02 08

215 545 00 08

220 545 00 08

220 545 09 08

220 545 07 08

220 545 03 08

221 545 11 08

221 545 05 08

221 545 03 08

221 545 12 08

221 545 13 08

246 905 58 01

246 905 47 02

639 545 05 08

639 545 06 08

639 545 01 08

639 900 22 01

639 545 06 08

906 545 30 08

906 900 39 01

906 545 40 08

906 900 42 00

906 905 06 00

906 900 39 01

906 545 65 08

Ctrl + F to find yours

Auto Locksmith in London Mercedes Jaguar Land Rover Renault Key Card replacement Bmw Porsche Vauxhall, Ford, Lexus, Toyota