ABS and brake light flashing..
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1st Gear
Joined: Jun 2006
Posts: 54
From:
ABS and brake light flashing..
When I drive around these lights keep comming on and it chimes at me.. Do you guys know what the problem would be.. Sensor of some sort...? They come on for like a minite and then they go away...
4th Gear
Joined: Mar 2006
Posts: 3,794
From: Home of the Yankees
RE: ABS and brake light flashing..
Could be something as simple as a wheel speed sensor dirty or loose. Or as in my case, the ABS control module. Go to the stealership or someone with a VAGCOM and run the fault codes. Like I said to another guy 2 threads ago, do a search to find alot of info on this.
Site Moderator
Joined: Aug 2004
Posts: 4,356
From: Jersey (orig. NorCal)
RE: ABS and brake light flashing..
On older ones it is. Mine has the same problem. Over time moisture builds in the ABS module and it goes bad. A new one from the dealer is over $1k. Apparentyl there's a company that rebuilds them for $250 in the midwest and gives instructions on how to take remove and install it. It was posted not too long ago.
1st Gear
Joined: Aug 2010
Posts: 7
I had this same problem, took it to an Audi mechanic...not the dealership. Simple problem that I am so lucky to have got checked out. The wheel was loose, only 3 out of 5 screws holding it in place. Thank you sensor light! Otherwise, I might've lost a wheel and my life!
3rd Gear
Joined: May 2008
Posts: 1,900
From: CT
Read the ABS CU with a VAGcom. If there is no communication, check power to the control unit (two large pins in connector, 12V each). If you have power to the CU, check resistance from pin 21 on the ABS connector to Pin 21 on the green instrument cluster connector (about 25M ohms if I recall correctly). If that passes, check the resistance from pin 11 on the ABS connector to the green wire in the OBD2 connector (the K line, about .5 ohms). If that passes, it's very likely the control unit.
In the ABS control unit, there is a wire that looses it's soldered connection to the control unit and the fault is usually "no communication" or the VAGcom wont even open the ABS CU.
If you don't want to try this yourself, I have access to a laser welder. I have had success repairing this before. PM me if you have questions or simply want me to do it!
Wiring Diagram:
http://www.lbak.dk/Audi/Repair_ABS_unit_passat.pdf
ABS CU repairprocedure:
http://www.lbak.dk/Audi/Repair_ABS_unit_passat.pdf
In the ABS control unit, there is a wire that looses it's soldered connection to the control unit and the fault is usually "no communication" or the VAGcom wont even open the ABS CU.
If you don't want to try this yourself, I have access to a laser welder. I have had success repairing this before. PM me if you have questions or simply want me to do it!
Wiring Diagram:
http://www.lbak.dk/Audi/Repair_ABS_unit_passat.pdf
ABS CU repairprocedure:
http://www.lbak.dk/Audi/Repair_ABS_unit_passat.pdf
Last edited by Tweaked; Sep 26, 2010 at 11:26 AM.
1st Gear
Joined: Nov 2010
Posts: 5
That is definately the right way to do the diagnostics, but in our shop we have never found the no communications error to be anything but the ABS control module. We use bba-reman to do our repairs. $139
Last edited by dartydave; Nov 17, 2010 at 10:47 AM.
