MERCEDES BENZ VITO 639 IGNITION BARREL SWITCH LOCK A6399005501 Q2 ZGS002

Mercedes-Benz Vito / Viano W639 Electronic Ignition Switch EIS / EZS – A6399005501 Q2 ZGS002

Genuine used Mercedes-Benz electronic ignition switch / ignition lock control module for selected Vito and Viano W639 vehicles.

This module is part of the vehicle's electronic ignition and immobiliser system and is responsible for key recognition, ignition authorisation and communication with other security/start-system components.

Part Numbers / Identification:

• Mercedes-Benz OEM: A6399005501
• Mercedes-Benz: A 639 900 55 01
• Version: Q2
• ZGS: ZGS002
• Marquardt reference: 3300.2363-03 / 3300236303
• Module type: EIS / EZS Electronic Ignition Switch
• Condition: Used
• Genuine OEM Mercedes-Benz part

The Mercedes number and Marquardt reference are documented together for the Vito/Viano W639 EZS system. ECU

Compatible vehicle range:

• Mercedes-Benz Vito W639
• Mercedes-Benz Viano W639

The A6399005501 module is documented across multiple W639 Vito applications, including 109 CDI, 110 CDI, 111 CDI, 113 CDI and other variants. Exact compatibility must nevertheless be established from the original module identification rather than model/engine alone. ECU

Common Faults & Symptoms

A faulty EIS / EZS ignition switch can cause symptoms such as:

• Ignition does not switch on
• Key is not recognised
• Key does not turn / no rotary release
• Vehicle does not start
• No Terminal 15 (KL15) activation
• Instrument cluster remains off
• Electronic steering lock does not release
• Intermittent starting problems
• No ignition response when the key is inserted or turned
• Communication/start-authorisation faults

These are documented failure symptoms for this specific A6399005501 EZS/EIS family. ECU

Common Fault Code

B1000 – EZS / Electronic Ignition Switch Control Module Fault

B1000 is specifically listed by specialist repair documentation for A6399005501 and can be associated with a defective EZS, no ignition, no KL15, no rotary release or a vehicle that will not start. ECU

Important: A fault code or starting problem does not automatically confirm that the EIS/EZS itself is defective. The key, electronic steering lock (ELV/ESL), wiring, power supply and associated immobiliser components should also be diagnosed.

IMPORTANT – Compatibility & Programming

Please compare A6399005501, Q2 and ZGS002 with your original module before ordering.

This is an electronic immobiliser/security-related module. Replacement may require specialist programming, cloning, personalisation or adaptation to the vehicle. It should not be assumed to be plug-and-play.

Please make sure your technician is able to install/program a used EIS/EZS module before purchasing.