How to Slove MB SD C4 Cannot Access OBD2 Port

When using china clone mb star c4 sd connect Multiplexer, it could not link to the car computer, MB SD Connect C4 offered a message, saying like “check cable connection / turn ignition on”. Then tried again, clone SDconnect compact 4 multiplexer cannot access OBD2 port

According to customer’s feedback that he failed to access to the diagnostic OBD port when tried to use sd connect c4 read errors code from Benz SRS system. The system prompted an error message “check cable connection/turn ignition on”.

Possible Reason:

The error lies on the SD Connect C4's battery.

​Solution from eobdtool.co.uk:

1) Check and record your MB SD Connect C4 multiplexer battery
2) Hook up a digital multimeter to set it to the direct current
3) Get two t-pins and plug them into the OBD socket at PIN 5 and PIN17 position
4) Put your positive lead to PIN16 and negative lead to PIN5.
5) Write down the voltage on the digital multimeter
6) Check if the voltage you from PIN16 and PIN 5 is same in step 1.
7) Find the light green wire with a blue tracer band of PIN10 of the OBDII connector.
8) If the voltage differs in step 1 and step 6, the problem is probably with your battery.
9) If the battery is damaged or broken, please replace your battery.

What SD connect is?

What SD connect is?

The new generation for Mercedes Benz SD connect c4 is the latest one on market for all current and new coming MB vehicles. SD connect is a Mercedes wireless multiplexer. It has VMware version which can fit all computers.Also has DELL D630 version.

What customer say?

Sdconnect is great, it is connected by wireless to computer, such a great convenient when do a diagnosis. It runs fast and also can support UDS protocal. Used it for many times, really a good staff.

Highlights:

1.Wireless connection

New MB SD Connect Compact 4 Star Diagnosis support wireless diagnose. It can connect to PC by WIFI.

2.Fit all computer

SD connect now use Lan cable to connect, can fit all computers not only IBM T30.

3.Support K-Line CAN BUS and UDS protocol

New Mercedes multiplexer SD connect 4 not only support K line diagnose and CAN BUS,but also UDS diagnose protocol. Because old MB STAR C4 main board do not have UDS chip, so old MB STAR C4 can not support it;

4.Work very stable

MB SD connector adopt Military quick swap technology, it can support 10,000 times pull plug, more stable. All core accosseries adopt original new packing chip, and 24hours test, guarantee the quality of the products;

The system offers total diagnostic coverage of all engine, chassis and body systems:

• Reading and re-setting of diagnostic trouble codes (DTC)
• Real-time reading of dynamic data
• Full component activation clearing and re-setting of adaptation values
• Coding of all engine, chassis, body and instrumentation modules
• Key configuration
• Procedure for fitting Mercedes- Benz accessories through the D2B ring and MOST bus
• Total ASSYST / ASSYST + control (Active Service System) to update on board service history
• DAS: Concise interface and straightforward operation using a wintel computer you can realize a quick and accurate code reading and testing on the cars system.