W202 C250D DLC connector pins and reading fault codes

[buckslad]

Does anyone know how to check the fault codes on a C250D W202 1995 model. My autodata CD seems to imply you can do it with a switch and a LED connected across some of the DLC pins, but this method seems not to work

I am in High Wycombe, is anyone nearby who can read the fault codes??

Cheers

Darren