Solution to SDconnect C4 fault (1.2)-2.503. 2.503.9901 Initialization of Diagnosis Multiplexer Failed.
usually caused by IP address incorrect.
Solution offered by eobdshop.com:
Re-set Mercedes Star diagnosis SD connect C4 Multiplexer IP address:
1) Connect Mercedes Star Diagnostic SD Connect C4 Multiplexer with LAN cable
2) Open Virtual Network Editor and use vmnet0 (Auto-Bridging )
3) Install (2 ) Local Area Connection
4) Set Mercedes Star Diagnostic SD Connect C4 Multiplexer IP:
Local Area Connection ( 1 ) IP 172.29.127.XXX this for IP MUX
Local Area Connection ( 1 ) IP 192.168.1.XXX this for IP network or IP Network you use
5) Make configuration for Mercedes C4 Multiplexer wireless
(Mercedes Star Diagnostic SD Connect C4 Multiplexer usually solve the issue after IP re-match)
If the IP is right, but you met the fault “ Initialization of Diagnosis Multiplexer Failed ” when you diagnose, and the diagnosis disconnect and connect again during the diagnosis, you have to update your mb sd c4 firmware.
mb sd c4 firmware update instruction:
Need 6pcs of double A battery, laptop with sd c4 software installed, c4 main part, lan cable, obd cable
Step 1: input the double A battery 6pcs into the c4 multiplexer, like the picture showing.
Step 2: connect the sd c4 to your car, click the connection icon at the right-bottom of laptop, see the picture below:
then update the bootimage 2_3zip and CSD_2_11 zip as the picture showing below:
If you get this problem showing as blow when you open the administration, just need to restart your laptop, then the problem will be fixed.