Solution to MB SD Connect C4 Booting Problem

MB SD connect C4 has now been updated to the newest version 2014.09. As a representative auto diagnostic tool, it has been given great attention by most car owners, especially for Mercedes Benz car owners

What can be done via MB star?

It is capable of reading out and erasing trouble codes, reading the real-time of sensor and actuator, coding and programming.

And we all know that new MB SD Connect Compact 4 Star Diagnosis supports wireless diagnose, work on both old and new Mercedes-Benz cars and trucks till year 2014.

A few days ago, I came across a booting problem via this device, but finally completely solved under help of my technician friend. Now, I want to share my own experience here, and hope it does helpful for anyone who is confronted with the same problem.

Booting Problem

Connecting MB SD C4 to a car and it starts up, but it will never finish booting, always show “device is booting”, nothing happen, and the computer can not find multiplexer.


1. First please disconnect all connection, re-connect the device to your car, without connecting laptop to check whether you can start the device.

2. If you try the above solution, but same problem happen, maybe there is problem of the power chip, you can buy a new power chip to replace it by yourself, or we will send you a new power chip as the following picture show , then you replace it.

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