Why cause Mercedes-Benz star diagnostic c3 connection error

Why cause Mercedes-Benz star diagnostic c3 connection error:
1. the autonumen Benz star c3 cable you use is broken,such 16 pin cable or the lan cable or others
2. the autonumen Mercedes-Benz c3 multiplexer HDD has some problem,maybe you use old HDD (fit usual c3) but use SD connect star C4 main unit
3. the autonumen star c3 diagnosis main unit has problem,then you have to connect with a car,to check,if main unit is turn green

GM MDI wireless supports offline lease function, online programming and Opel offline programming. It also supports cable/wireless communication and original factory latest software. With the European Chevrolet Global TIS,

Wifi gm mdi tech 3 Diagnostic & Rerogramming insatlled EVG7 Tablet P with GM MDI Global TIS software from autonumen.com also comes with GM MDI Global TIS 32B installed that can work for GM, for SAAB, for OPEL, for Holden, for GMC, for Daewoo, for Chevrolet, for Buick and for Cadillac.GM MDI supports European Chevrolet offline programming, also MB SD C4 with EVG7  is very popular in the market.

Launch X-431 Diagun Full set Highlights:
1. Engineer Version
2. With 110 software
3. Free Three Years update by Email
4. Language:Enlgish, Germany, Italy, French, Turkey, Poland, Arabic, Spanish, Portuguese, Dutch, Greek, Hungarian, Serb, Farsi, Romanian, Korean, Danish, Czrech, Swedish, Finnish language and so on.
5. Support full system car diagnosis and up to 110 car models
6. Diagnose by Bluetooth
7. Allow you to print our vehicle fault data with a mini printer
8. Instruction of how to update X-431 Diagun