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Old 02-08-2021, 04:41 PM   #1
Join Date: Nov 2020
Location: South Dakota
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Diagnostic port.

I have a. 04 Roseair 3955et 370 work a cummins 8.9 400. I and installing a scanguage d. I found the obd port near the radiator, but can't find the one is the coach. I on the steering column bit no joy. Any idea where else to look?
2004 Rexhall Roseair. 3955ET 370
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Old 02-09-2021, 08:48 PM   #2
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Way up under the dash, and it can be a standard 9-pin round grey connector. I found a low cost Data Link to OBD II connector/adapter but it turns out that my OBD II device won't read the Freightliner codes.

It's a problem of the OBD II manufacturers not putting people onto decoding something that they consider rare. OR the chassis manufacturers call it proprietary. I think there's an upcoming Federal rule requiring OBD II link like in cars where they are required to make their codes available for decoding but when that'll happen I don't know. Note also that truck chassis manufacturers where not required to have any codes at all up until 2005 so anything you get from yours is 'bonus'.

Here's a picture of where I found mine in front of the drivers left foot. Note that I plugged in a pigtail type adapter and then my OBD II device:

'02 Winnebago Journey DL, DSDP, 36' of fun.

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Old 02-10-2021, 06:00 AM   #3
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Thanks. I will take a look. I get my scanguage D Monday.
2004 Rexhall Roseair. 3955ET 370
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Old 02-22-2021, 06:49 AM   #4
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I found it. There is a kick panel on the left side of the steering column. The plug was right behind it.
2004 Rexhall Roseair. 3955ET 370
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