Electronic Ignition Switch (EIS/EZS) Repair Perth

The Mercedes-Benz Electronic Ignition Switch (EIS), also known as the Electronic Ignition Starter Switch (EZS), plays a vital role in your vehicle’s security and starting system. It works hand-in-hand with the smart key to verify authorisation before enabling engine start-up. When a valid infrared key is inserted into the ignition slot, the EIS and key exchange rolling security codes. Once validated, the EIS allows communication with the Electronic Steering Lock (ESL) and Engine Control Unit (ECU), activating the ignition and starting the engine.

 

Over time, the EIS module can develop faults that cause starting problems or complete ignition failure. These issues are especially common in high-mileage vehicles or those exposed to frequent key cycling.

Typical symptoms of EIS failure include:

• The key not turning in the ignition

• Intermittent or no engine start

• No dashboard lights when inserting the key

• Steering lock failing to disengage

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These problems often stem from internal circuit board damage, failed solder joints, EEPROM data corruption, or communication errors between modules. Water ingress, voltage spikes, or incorrect jump starts can also contribute to failure.

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At Eurotronix, we specialise in Electronic Ignition Switch Repair Perth drivers rely on. Our expert technicians use advanced diagnostic, programming, and coding equipment to accurately identify EIS faults and provide reliable, cost-effective repair solutions—often at a fraction of dealership pricing. In many cases, we can clone data from your faulty EIS into a new or donor unit, preserving your existing key programming and security settings without the need for expensive reprogramming.

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We service a wide range of Mercedes-Benz models, including the C-Class, E-Class, S-Class, ML, GL, and Sprinter vans. With years of hands-on experience and a strong reputation in automotive electronic repairs, Eurotronix is the trusted choice for Mercedes ignition switch repair in Perth. Our services are available at our Perth workshop or through our convenient mobile service, helping you minimise downtime and towing costs.

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If your Mercedes is showing ignition issues or won’t start, contact Eurotronix today for professional Electronic Ignition Switch Repair in Perth—fast, affordable, and done right the first time.