EZS
Ignition won’t switch on? We repair your ignition switch.
The electronic ignition switch (EZS) checks your key and enables the vehicle. If it fails, the Mercedes won’t start. We repair your original EZS.
Typical symptoms
- Key goes in but won’t turn
- Ignition won’t switch on, instrument cluster stays dark
- Key isn’t recognised, vehicle won’t start
- Faults appear intermittently, e.g. only when cold or warm
- Key can’t be removed any more
What causes it?
Electronics, key recognition and mechanics work closely together in the EZS. Over the years contacts and components wear, solder joints crack and communication with the key or other control units breaks down.
On many Mercedes models the EZS works closely with the electric steering lock (ELV). If the ELV is faulty, the key often won’t turn either. We establish which part really is the cause – a weak key can also cause similar symptoms.
Focus on Mercedes-Benz. AEZ is an independent master workshop; brand names are used for description only. We tell you whether a repair is possible after testing.
How the repair works.
- 1
Get in touch
Vehicle, VIN and what happened – via WhatsApp, phone or form.
- 2
Drop off or send in
Hand it in at Bottrop or, after a quick chat, send it by DHL. How shipping works
- 3
Test, price, repair
You get the findings and price before we repair. Then the unit goes back to you.
Frequently asked questions
Do I need new keys programmed after the repair?
Usually not. Because we repair your original ignition switch, the data and your existing keys are kept. We tell you in advance if anything needs adapting in your case.
How much does the repair cost?
That depends on the unit and the fault. After testing we tell you the price – we only repair with your approval.
Can I send the control unit in?
Yes. After a quick chat, by DHL to AEZ, Werkstraße 4, 46240 Bottrop, Germany. Packing tips and the shipping note to fill in are on the “Sending in a control unit” page.
Do you only work on Mercedes-Benz?
Our focus is Mercedes-Benz. For other makes, just ask with the vehicle and part number – we’ll tell you honestly whether we can help.