2003 C220 CDI Electrical/sensor help required

[JAGS]

2003 - 03 Reg C220 CDI

WDC2030062R086947

Hi all,

Need a bit of technical help if possible in relation to the car mentioned above.

I need to find out the actual location of a particular sensor where the car is showing up with a fault. The fault reads as:

'C1185 BAS Diaphragm Travel Sensor A7/7B1 Electrical Fault'

Any help would be greatly appreciated.

Thanks

[mbtech01]

The Bas diaphram travel sensor is located in the brake servo. Its a black sensor thats used to sense the travel of the diaphram within the brake servo & how fast the diaphram moves.
The fault code you have relates to a problem with the wiring in the main connector plug that connects to the esp control unit. This was a common problem on W203 C class mercedes a few years ago & was a well known problem. Mercedes produced a repair kit consisting of 3 new wires & terminals that had to be installed after cutting out the 3 affected wires from the original loom to the esp control module. It took about 20 minutes to do if memory serves me right.

[JAGS]

Thank you for the help, much appreciated!

Another question to pick your brain...

Would you know which wires/pin number they are?
Or if there is some kind of diagram available?

Sorry if I am asking too much, just want to make sure before I set about the car with my wire cutter!

Thanks once again.

[mbtech01]

hi, its pin numbers 3,5 & 7 if memory serves me right. I'll try & get a part number of the repair kit tomorrow & see if i can find out the wire colours.

[JAGS]

Thank you for your help!
The part number/ wire colours would be very helpful!

Much appreciated.

[mbtech01]

Hi – here’s some more info. The part number of the repair kit required is 203 540 56 33. This kit includes 3 new wires & terminals plus a cleaning kit. Your also supposed to use 3 x solder connections (Raychem) – 001 546 99 41, to join the new wires but I personally prefer soldering the wires in place & then using heat shrink to insulate & seal the soldered joints. Finally Mercedes tell you to use a fabric tape to reinsulated the loom once the new wires are installed – part number 006 989 84 85 10.
The colours of the affected wires are pin 3 – blue, pin 5 – brown/blue trace & pin 7 – violet/blue trace. Please don’t quote me on these colours as Mercedes have a habit of changing their wiring colours depending upon model year/production date etc.
I’ve included a diagram of the connector plug showing location of the pins. This esp connector plug is located on the abs/esp hydraulic unit that can be found under the bonnet on the right hand side as you look into the engine bay in front of the n/s/f strut.
Please note if you do decide to carry out this repair yourself then you do so at your own risk & i will not accept any responsibilty if you cut the wrong wires etc. I have tried to point you in the right direction & hope you can appreciate this.

[JAGS]

A massive Thank You for the part numbers/picture.

I'll let you know how I get on with the fix.

Thanks once again fella, much appreciated!