On my 1994 Mercedes E320, the self test 16 pin Diagnostic module near the battery will not blink after pressing the button for codes. It only stays lit when pressing the button and when I release the button after pushing and staying 3 to 5 second, no blinks for codes.

Someone mentioned somewhere that the Diagnostic module 015 545 43 32 01 located under the dash behind the steering wheel may be defective and needs to be replace. Is this particular diagnostic module a wear and tear item?

So I did some checking on that particular part and read that it may needs to be reprogram through a dealership. Anyone out there knows about this? Any truth to that?


Comments, feedback or advice is greatly appreciated.