BlackT
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« on: December 05, 2020, 08:37:19 AM »
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I recently bought allroad MY 2001, I have manage only once to connect with VCDS, but only when car was off. Now it is not posible, VCDS show K-line short to ground With many may tries i have manage to read cluster PN but than no response from controler. Also LED on VCDS cable blink with red color(on other cars it glow green LED) I tried to put on OBD plug ground and 12V from some other place of car but without progress. Car have many equipement, I suspect that some module is interupting K-line. But how to find witch one? Is there some familiar error with some of modules?
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nyet
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« Reply #1 on: December 05, 2020, 12:04:55 PM »
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Why are you taking pictures of your screen instead of using screen shot?
And wtf is up with a portrait picture of a screen? bizarre. Please, show some attention to detail. You've been here long enough to know better than to take shortcuts and be sloppy.
Also, try a dedicated kline to rule out any other issues.
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« Last Edit: December 05, 2020, 12:06:44 PM by nyet »
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macxxx
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« Reply #2 on: December 06, 2020, 04:47:06 AM »
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first check if there is a aftermarket radio - usually there is some short circuit to K-line in connections
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BlackT
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« Reply #3 on: December 06, 2020, 07:18:45 AM »
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Why are you taking pictures of your screen instead of using screen shot?
And wtf is up with a portrait picture of a screen? bizarre. Please, show some attention to detail. You've been here long enough to know better than to take shortcuts and be sloppy.
Also, try a dedicated kline to rule out any other issues.
I am posting from mobile phone, so don't have screnshots from PC. Also my internet connection is realy realy bad(slower than dial-up) so it is really hard to post. Sorry for that, when I get home I will fix it first check if there is a aftermarket radio - usually there is some short circuit to K-line in connections
As far I can see everything on car is OEM
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macxxx
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« Reply #4 on: December 06, 2020, 09:39:19 AM »
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Check voltage on kline
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BlackT
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« Reply #5 on: December 06, 2020, 10:46:00 AM »
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Check voltage on kline
That was first what I checked, it is stable
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nyet
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« Reply #6 on: December 06, 2020, 10:49:54 AM »
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start with a dedicated k line and go from there
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BlackT
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« Reply #7 on: December 06, 2020, 11:08:52 AM »
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start with a dedicated k line and go from there
What you mean by that dedicated k-line?
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nyet
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« Reply #8 on: December 06, 2020, 11:10:14 AM »
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1) does it work on the bench 2) if so, run a dedicated kline from the obd connector in car directly to the ecu
if that works, you have a harness issue
if neither works, either your ecu is bad or your cable is bad
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« Last Edit: December 06, 2020, 11:12:56 AM by nyet »
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BlackT
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« Reply #9 on: December 06, 2020, 11:14:29 AM »
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Yes that is my plan also, even I am 99% it will work on bench. In that way I will only test that ECU is fine. But I need full diagnsotic on car
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BlackT
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« Reply #10 on: December 07, 2020, 02:59:23 PM »
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I cut K line from cluster and connect it to obd port. Now I can connect to cluster and ECU. Cluster show comunication error with telephone modul. So that is where I will start. I will find telephone module, unplug it and see what will happen
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macxxx
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« Reply #11 on: December 07, 2020, 04:08:25 PM »
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it should be in passenger footwell , under the carpet , almost on the firewall
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BlackT
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« Reply #12 on: December 07, 2020, 05:08:50 PM »
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Under carpet: TCU is in front of pasaanger seat, ESP control unit is on firewall( in front off legs) and that is all I can see on passanger side...
I see something brown under arm rest, behind gearbox lever. But it is hard to get it to that module, but it could be that what I am looking for
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macxxx
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« Reply #13 on: December 07, 2020, 11:39:38 PM »
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Yes but if you have that brown telephone module in centre console then it has no diagnose connection so its not it.
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BlackT
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« Reply #14 on: January 14, 2021, 06:20:23 AM »
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it should be in passenger footwell , under the carpet , almost on the firewall
You were right, I have looked on same car on yunk yard, and didn't have this module. But my car does, big Nokia module full of corosion. Now K line is free
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