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General E46 Forum
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Old 03-01-2012, 12:44 AM   #21
timothyfuqua
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Need some info on testing the KBUS once you have the comb removed and access to all of the wires. I've read about testing the KBUS itself (should be 12v), testing for continuity on each wire and so on. I'm not super familiar with multimeters and this is where I have a few questions. Where do you place the test leads to test the KBUS? I'm assuming it's the actual metal comb itself that all of the wires are connected to? Also, to check for continuity (or resistance/lack of resistance), where to place the test leads?

I've also read that only a digital multimeter should be used as an analog meter draws enough current to potentially damage sensitive electronics. Not sure if that's BS or not, just wanted to be sure. Any info is greatly appreciated.
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Old 03-01-2012, 05:10 AM   #22
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If you have a temp sensor etc in the plastic splash shields/underbody wheel well panels, (under the front bumper), check them too..

Sometimes those sensors get damaged or ripped out and wires are exposed if the car hits road debris.
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Old 03-01-2012, 12:35 PM   #23
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Yea thought of that and it checked out ok, but thanks for the input. BUMP for KBUS testing info?
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Old 03-01-2012, 12:46 PM   #24
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Jbeurotech, if you're out there I'm going to need you to step away from your business and your paying customers and help a complete stranger who will offer you no compensation whatsoever, and I need you to do it now!!!
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Old 03-04-2012, 02:36 AM   #25
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Old 03-04-2012, 05:18 AM   #26
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http://www.e46fanatics.com/forum/sho...d.php?t=430153

Tim, if you hadn't read this post before, I hope it helps. Would be awesome, especially after the time you've struggled with this.

Doesn't answer your question posted just above, but responds to your issues in the first post.

HTH
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Old 03-04-2012, 08:51 PM   #27
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I have read the post and it was helpful. Thank you for chiming in and offering your help. Hopefully I'll get the info I need soon. Thanks again.
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Old 03-08-2012, 10:29 AM   #28
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http://forum.e46fanatics.com/showthr...=bus+diagnosis

http://forum.e46fanatics.com/showthr...&highlight=bus

Read!!!!
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Old 03-09-2012, 01:27 AM   #29
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Thanks and I have read those very posts through and through. They were very helpful but didn't answer my questions about testing the KBUS splice with a multimeter. Another member asked a similar question as to the testing process but his question wasn't answered. I'm assuming when testing for voltage you want the + lead on whichever wire you're testing and the - lead on a grounding source? To test a KBUS wire at the comb for continuity, I'm assuming it would require you to place a test lead on the wire at the comb itself and the other test lead where the wire connects to the specific module you're testing. These were my only questions that, after furious searching, I couldn't really find a definitive answer to. To be clear, I try really hard not to post questions without a lot of searching and a lot of reading on this forum. Thanks again for everybodys time.
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Old 03-09-2012, 07:37 AM   #30
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One lead on the Comb the other on Ground!
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Old 05-30-2012, 02:06 PM   #31
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Well the time is finally here when I can say that the problem has been properly diagnosed. After a lot of reading and research, and with the invaluable help of members here, I've tested the KBUS and found that the passenger side mirror has been the culprit all along. I'm going to post pictures later of how to remove the KBUS comb and test it for future references. Anyway, I'm not sure if there is a short in the wire or perhaps the motor inside the mirror housing is bad. I'll go from here with a lot more experience and information under my belt. I'll keep the latest info posted and hopefully it can help members in the future.
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Old 05-30-2012, 02:24 PM   #32
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I've had the same problems on and off since I bought the car, I even had everything out for a period of 6 months straight. Jbeurotech's threads have been a huge help. For me it was my rain sensor module. I haven't properly fixed it yet, but unplugging it and plugging it back it seems to fix the problem for a while...until it comes back.
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Old 10-05-2012, 03:36 PM   #33
timothyfuqua
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Same here. I isolated the problem to the passenger side mirror switch, which I have left disconnected. There is definitely a short or exposed wire in there somewhere that rain/moisture wrecks havoc upon. It's still a great comfort to know what and where the source of the problem is so I can tackle it in the future. Forum FTW!!
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