The situation.
The Electronic Ignition Switch (EIS), also called EZS, participates in Mercedes drive authorization. A key that is not accepted or an ignition that remains unresponsive can involve the key, ignition switch, steering lock, power supply or another fault. Those possibilities need to be separated.
The approach to your vehicle.
We identify the chassis and authorization generation, compare the behavior of available keys and assess the ignition and related system. Where the EIS is confirmed as the issue, we discuss repair or compatible replacement and the necessary setup. Keep the original EIS and keys available.
Questions about mercedes eis / ezs repair.
Are EIS and EZS different parts?
They are commonly used names for the Mercedes electronic ignition-switch unit. The exact part and generation still need identification.
Is an EIS fault the same as an ESL fault?
No. The ignition switch and electronic steering lock are separate components in the authorization system. Similar starting symptoms can require different repairs.
Can every EIS be repaired or every used unit be programmed?
Support depends on the unit, damage, authorization generation and replacement compatibility. The proposed repair is confirmed after that assessment.
