Mercedes-Benz 2000–2013 EIS / EZS Ignition Switch Repair, Cloning & Programming

Restore your Mercedes ignition system without expensive dealer replacement! Our professional Mercedes-Benz EIS (Electronic Ignition Switch) cloning and programming service saves you time and money. Ideal for models built between 2000–2013.

🔧 How It Works

1. Remove your EIS and key from your vehicle.
2. Include a matching donor EIS module (used or new) with the same part number.
3. Add this service to your cart, complete payment, and send both EIS modules (marked Old and Donor) along with a printed receipt or order number to:

Module Medics
606 Baltimore Ave, Suite 405
Towson, MD 21204

Once received, we will:

• Clone your original EIS data onto the donor EIS
• Bench test the EIS and key for quality
• Return your working cloned EIS within 3 business days

🚚 Free 2–3 day return shipping is included. Need it faster? Include your own overnight return label.

Once reinstalled — simply plug in and start the car. That’s it!

⚠️ Common Mercedes EIS / EZS Ignition Switch Symptoms

• Key won’t turn in the ignition (no rotation at all)
• Key turns but car won’t start
• No response from dash or instrument cluster
• “Remove Key” or “Key Not Recognized” message
• No crank or start even with a good battery
• Intermittent ignition or key recognition issues
• Remote locks/unlocks but ignition doesn’t engage
• Steering lock (ESL) not clicking or unlocking
• Gear selector stuck in Park (EIS authorization failure)
• Accessory power anomalies (radio/windows active but no start)
• Multiple CAN communication faults stored (EIS/ESL/ECM)
• Battery drain or low-voltage sensitivity

💡 Why the EIS Ignition Fails

If the EIS (Electronic Ignition Switch) becomes faulty, the key may stop turning or the engine won’t start. When this occurs, the ignition function disables itself, locking the module as a security measure. Common causes include:

• Jump-starting the vehicle while the key is inserted
• Electrical surges or voltage spikes
• Low or unstable battery voltage

These issues can lead to memory corruption or CPU failure within the EIS. Once corrupted, the module cannot be repaired or re-flashed using standard Mercedes diagnostic tools like Xentry, Star, or DAS. Dealerships typically recommend full replacement — a costly solution.

Our service offers an affordable alternative. By cloning your original EIS data to a donor unit, you retain your existing keys and avoid dealership programming costs.

🧠 Technical Insight

Common failures occur in EIS units equipped with the Motorola HC08 microprocessor (Maskset 4J74Y). These older modules often exhibit intermittent key recognition or total CPU crash, similar to a frozen computer. Our advanced cloning process restores full functionality and key synchronization.

🚘 Compatible Mercedes-Benz & Sprinter Models (2000–2013)

A-Class: W169
B-Class: W245
C-Class: W202, W203, W204
E-Class: W210, W211, W212, W207
S-Class: W220, W221
ML-Class: W164
GL-Class: X164
CLK-Class: W208, W209
CLS-Class: W219
GLK-Class: X204
G-Class: W463
V-Class: W639
CL-Class: W215, W216
SL-Class: R230
SLK-Class: R171
R-Class: W251

Supported EIS Part Numbers Include (and many more):

A164 905 15 00
A203 545 01 08
A203 545 05 08
A203 545 06 08
A210 545 00 08
A210 545 10 08
A215 545 00 08
A215 545 08 08
A220 545 03 08
A220 545 07 08
A220 545 08 08
A220 545 09 08
A230 545 07 08

❓ Frequently Asked Questions (FAQ)

What happens if you can’t repair my EIS?

We’ll return your parts and issue a full refund. No repair, no charge.

How long does the entire process take?

From the day you ship to the day you receive it back is usually 6–10 days total (including transit time).

Where are repairs performed?

This work is done in-house at our Towson, Maryland facility.

What warranty do you offer?

All cloned EIS units include a 90-day warranty covering workmanship and functionality.

Do I need to program anything after installation?

No additional programming is required. Once you receive your cloned module, simply reinstall it — your keys and immobilizer data remain synchronized.

Can you clone from a water-damaged EIS?

Yes, in many cases we can extract the data even from partially damaged units. If recovery isn’t possible, we’ll refund your payment.

Is this service compatible with Smart Keys or Keyless-Go?

Yes, our cloning process supports both standard and Keyless-Go Mercedes-Benz systems.

🧭 Why Choose Us

• Save hundreds over dealer EIS replacement costs
• Fast 3-business-day turnaround after receipt
• Free return shipping within the U.S.
• Bench-tested for guaranteed functionality
• Expert Mercedes electronics specialists

Order now and get your Mercedes back on the road quickly — no reprogramming, no hassle!