I am currently in the middle of a major dispute with Mercedes-Benz regarding
diagnostic software and why it is so completely useless with some older
models, in my case, a UK 1995 E200-124 with an SRS problem.
During my research which has often led me up a number of 'blind alleys', I
came across the following extract from a technical bulletin. To my
untrained eye, this reads like an explanation of why current MB diagnostic
software (Star) is unable to obtain the error codes necessary to diagnose
faults. I need to know if my assumption is correct.
Do I also assume that I must have an analogue connector, simply because it
is 16-pin? With some helpful assistance, I managed to check this for
myself; the diagnostic box is located behind the firewall and in front of
the brake fluid reservoir (on U.S. specs, I understand that it is located in
front of the battery).
Incidentally, are U.S. MB dealers legally obliged to follow the procedure
laid down in this bulletin?
Carsoft USA Technical Bulletin ABM: 310803d: COMMON PROBLEMS AND SOLUTIONS
FOR CARSOFT MB
5. "Module Does Not Respond"
Problem: Is the module digital or analogue?
Chassis Affected: 1992-1994 W124, W140, R129, and W202
1. Between 1993 and 1995 production dates, Mercedes-Benz models had a mix
of some digital and some analogue modules on the same car.
2. Technicians should be aware that these cars might have a 38-Pin digital
connector, or an 8/16-Pin analogue connector. A 38-Pin Connector does not
guarantee an all-digital car.
3. If in these cases, analogue diagnosis is still required through the
38-Pin connector or the 8/16-Pin analogue Connector for the analogue
4. Not all cars are affected.
Analogue or Digital: Airbag
1. All digital from 1994-1995; but finds only one fault at a time, just as
1988-1993 analogue cars.
2. Clear each fault before testing for the next fault.
3. Test as analogue first, then digital, on pin 6 (16-pin) or pin 30