Does anyone know what this connector is in the picture? I have a 2013 C200 auto.

It's below the steering column. I accidentally knocked it and broke off some of a green/orange connector whilst putting the trim panel back on, which I took off to lubricate the foot brake. Now I have an airbag warning light on.

Any help appreciated.

 

It probably goes to the knee air bag. If you look at the wiring harness there should be a label with a part# on it, Mercedes are usually good for that.

That connector looks similar to the picture below.








If you can find the part# on the wiring you can probably find a used one and just replace it. Heres an example, not sure if its the correct one for yours though.



I havent worked on my air bags before but I think i read its a good idea to always disconnect the battery when working on it so it doesnt pop off codes that have to be reset by the dealer.

 

Thanks, yes that is it. Should hopefully be an easy fix but there isn't a lot of room down there. Any idea where the other end of the cable is connected to?

 

The parts diagram just shows the connector (900).








And if replacing the connector the manual says to disconnect the battery.

 

Thanks so much. I've ordered a cable and a obd 2 reader that does airbags.

 

What scan tool did you order? Make sure it is specific to Mercedes. You will use it time and again, and you want it to cover ALL control modules.

 

Hi. Off eBay, XTOOL AD20 PRO. It works fine and picks up all sorts, unfortunately the light comes back on again after being cleared so will replace the connector. What's the best sort of connector to connect old wire to new, or just solder?

 

I like to solder my connections. Slip the heat shrink on the wire first, then twist the wires together and solder. Move the heat shrink over the connection and heat till its tight.

Something like the photo below. I'd use a longer piece of heat shrink.

 

So I did the repair, I bought the replacement plug from eBay as shown on an earlier post. I soldered wires, then clear the fault and the the warning comes back on again within seconds. Any ideas?

 

What code do you have?

(XTOOL AD20 PRO is a cheap generic scan tool and worthless for Mercedes. Get a proper one like the LAUNCH Creader Elite 2.0 BENZ on Amazon.)

 

I don't think the tool is the issue as it finds it and clears it fine, it's code B00042.

 

I searched for that code and came up with:

B0042 - Left Front/Driver Frontal Deployment Loop Circuit

Searching other sites, not Mercedes specific cars, and came up with this:

• DTC B0022 (stage 1) or B0042 (stage 2) will set when the steering wheel module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.

Looks like maybe it has to do with the steering wheel air bag. I could be totally wrong though since I'm searching general sites. On one site, a Hummer forum, the guy removed the steering wheel air bag inspected the wires and found a frayed wire. Fixed the wire and resolved the issue.

Another thing I read is it takes a certain number of drive cycles for the air bag light to clear. Or its a hard code and needs a Mercedes scan tool to clear it.

Another site had this:

• B0042-stage 2 will set when the steering wheel module deployment loop resistance is less than 1.3 ohms for 500 milliseconds.
This type of problem is normally caused by a faulty steering wheel air bag module, steering column sir coil, or even possibly the the inflatable restraint control module. This type of failure requires testing tools that normally only a dealer has specifically a SIR load testing tool. This system is not user friendly. Feel free to contact me with any questions or if you would prefer a second opinion.

I would go back to what you previously did, remove the panel, and inspect everything. Disconnect the battery and try reconnecting the air bag connector. I would disconnect the battery before you remove the panel to be safe.