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post #1 of 13 (permalink) Old 06-29-2013, 06:41 PM Thread Starter
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OBD diagnostic tool

I have an OBD - USB adapter for my laptop and an old diagnostic program called Laplogger.

The adapter has 2 rows of 8 pins each. It is marked OBD Diagnostic interface, Multi protocol USB version, EOBD, OBD, CAN. RoHs compliant.

Is this compatible with any Mercedes models? Do they use standard codes? Is it possible to download a diagnostic program?
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post #2 of 13 (permalink) Old 06-29-2013, 08:28 PM
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Mercedes cars of the appropriate age do have OBD-II connectors and you can use generic code stuff with them. You won't get the Mercedes-specific codes, though.
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post #3 of 13 (permalink) Old 06-29-2013, 09:26 PM Thread Starter
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Laplogger is still around, I will update my software tomorrow. It seems Mercedes have standard ports plus a more elaborate system of their own. So I should be able to get a lot of info off any car I am looking at buying.
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post #4 of 13 (permalink) Old 06-30-2013, 12:45 AM
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Originally Posted by Rusty O'Toole View Post
Laplogger is still around, I will update my software tomorrow. It seems Mercedes have standard ports plus a more elaborate system of their own. So I should be able to get a lot of info off any car I am looking at buying.
Indeed so. I don't know if Laplogger has the ability to read codes from a multiplexer connected tot eh 38-pin Mercedes diagnostic port in the engine compartment, but even reading just the standard codes will tell you enough to know whether the car needs anything expensive.
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post #5 of 13 (permalink) Old 06-30-2013, 06:41 AM Thread Starter
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I only have the standard 16 pin. Where does Mercedes put the port for this, on other cars it is below the steering wheel?
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post #6 of 13 (permalink) Old 06-30-2013, 12:13 PM
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The newer MB star systems can us the ODB II port to access all control units. They are wired so that ODB II port is capable of at least what the 38 pin port is.
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post #7 of 13 (permalink) Old 06-30-2013, 07:03 PM
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Originally Posted by Rusty O'Toole View Post
I only have the standard 16 pin. Where does Mercedes put the port for this, on other cars it is below the steering wheel?
The 38-pin plug is inside the engine compartment, in the same box with the fuses and the computers. The vintage cars you're looking at will have it there, and not available in the OBD-II plug.
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post #8 of 13 (permalink) Old 06-30-2013, 07:46 PM
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If I remember from other topic, you are searching for late 1990's/2000 models.
Those are first generation of digital cars so not all the sensors are available.
On my 1998 model, I can read live data with ELM scanner, but some of data turns to be bogus.
Than OBD codes are mostly for emission stuff, what is not expensive to fix, while OBD will not read transmission or more advanced codes.
If you are buying a car that has a visible problem and no CEL, you better take it on star computer.
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post #9 of 13 (permalink) Old 06-30-2013, 09:27 PM
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Well this a yes and no answer.

When ODB II became the law in the US in 1996 all car makers had to respond and did.
MB had the HHT (Hand Held Tester) for that. It did all the regular ODB II stuff and as it progressed with the proprietary MB stuff it could even do that. Then came the MB SDS using DAS and now Xentry whiich over an ODB II port can do all the same things as the the 38 pin port could do with the HHT and then some if developer mode was activated for Xentry/DAS.

So No for mid 90s, but yes for 98 and newer US spec MB vehicles. If going older than 1998 cars then the 38 pin port is the only way to access all vehicle control units.
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post #10 of 13 (permalink) Old 07-01-2013, 05:33 AM
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Interesting. Wonder how come the folks who make the 38-pin multiplexers don't make an OBD-II connector version.

In any case, there's been people reporting Carsoft and the 38-pin connector working on post-facelift W210s, so the data's present at least till 2002 or so.
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