No signal from OBDII port - Mercedes-Benz Forum
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#1 (permalink) Old 05-01-2008, 01:12 PM
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No signal from OBDII port

Hi all,

I have been surfing the forum for a while and never needed to post until now. Lots of good info on here!!


Yesterday the check engine light came on in my 2000 E430. I scanned the car and retrieved 2 codes P0170 and P0173. Per instructions on this forum I cleaned the MAF and changed the air filter and then cleared the codes. Well after driving for about 20 minutes the light came back on.

Now for some reason when trying to scan for the new codes my code scanner will not even power up. I also went to autozone and tried 2 different scanners and neither of theirs would power up. Thinking I may have a blown fuse I checked all of the fuses in the fuse panel under the hood, in the side of the dash, and under the rear seat. None seemed to be blown. Also I could not determine which fuse would be used to power the data link connector. Any help here would be grateful. Also does anyone know where online I could find some electrical schematics for my E430?

Thanks in advance for your help.

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#2 (permalink) Old 05-01-2008, 01:20 PM
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....Thinking I may have a blown fuse I checked all of the fuses in the fuse panel under the hood, in the side of the dash, and under the rear seat. None seemed to be blown....
I don't think you are always able to tell if a fuse is blown simply by looking at it. Maybe that AutoZone has a voltmeter with which you can check them more accurately.

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#3 (permalink) Old 05-01-2008, 01:22 PM
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I don't think you are always able to tell if a fuse is blown simply by looking at it. Maybe that AutoZone has a voltmeter with which you can check them more accurately.
Do you have any ideas which ones I should focus on? I would hate to pull every one and test them all one by one.
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#4 (permalink) Old 05-01-2008, 01:23 PM
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There are more fuses on the K40 relay module.
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#5 (permalink) Old 05-01-2008, 01:24 PM
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Sorry, no I do not but your owner's manual might have a fuse chart. Also, are there no charts on the fusebox covers?

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#6 (permalink) Old 05-01-2008, 01:29 PM
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Sorry, no I do not but your owner's manual might have a fuse chart. Also, are there no charts on the fusebox covers?
Yes I looked at the charts on the fusebox covers but nothing clearly identified a particular fuse as relating to the data link connector.
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#7 (permalink) Old 05-01-2008, 01:30 PM
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There are more fuses on the K40 relay module.
Where can I find the K40 relay module?
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#8 (permalink) Old 05-01-2008, 01:33 PM
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Hey has anybody had problems taking there car to the car wash and getting the rubber antenna riped off and if so is there a cheap place to get just the rubber part
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#9 (permalink) Old 05-01-2008, 01:37 PM
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Looks like I told you wrong regarding the owner's manual. Mine only shows the 3 fusebox locations you have already checked. It also says there are fuse charts in the boxes themselves but those obviously did not help you.

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#10 (permalink) Old 05-01-2008, 01:42 PM
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Hey has anybody had problems taking there car to the car wash and getting the rubber antenna riped off and if so is there a cheap place to get just the rubber part
Check the DIY Stickys at the top of this forum (Body, Trim, etc.). Look for Antenna Fix by JamieK.

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Last edited by Musikmann; 05-01-2008 at 01:45 PM.
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