BAS ABS warning after carwash...
Thread Starter
Member
Joined: Jun 2008
Posts: 215
Likes: 6
From: San Diego
2012 CLS63 AMG Performace - Obsidian Black
BAS ABS warning after carwash...
Hello all, and Happy New Year! Odd little problem today, and it reset itself after a start-restart. After going through a no-touch, fairly high pressure car wash, the BAS ESP Visit Workshop warning came on after my first start (I had gone to Wallyworld, got some goodies, and got the warning on restart).
The ABS module is new according to my VMI, as are most of the brake components. I would assume that one of the ABS sensors got wet, but is this common? Rather odd... Anyway, I keyed off and re-keyed it, after turning the wheel full travel, and no warning...
I don't mind when stuff breaks, because that means its fun time in the garage for me, but intermittant stuff? Grrrrr.
Anyone else?
The ABS module is new according to my VMI, as are most of the brake components. I would assume that one of the ABS sensors got wet, but is this common? Rather odd... Anyway, I keyed off and re-keyed it, after turning the wheel full travel, and no warning...
I don't mind when stuff breaks, because that means its fun time in the garage for me, but intermittant stuff? Grrrrr.
Anyone else?
Junior Member
Joined: Mar 2009
Posts: 59
Likes: 0
W220
These warnings will also come up if Transmission Control Module is malfunctioning. In addition to those two, sometimes my transmission computer gave me Airmatic warnings and ESP messages.
Turned out it was oxidation on the computer's circuit board that turned up all those messages. Once I took it out, dried it and put it back, everything went away.
Since you don't mind looking in, you may want to open the passenger side fuse box under the hood and inspect the transmission computer.
My issue occurred also after a car wash, I was sorry that I did not open and dried the computer until a week after this happened, as by then, half of the board was oxidized. I had to clean it with alcohol and dry it up, after which everything went back to normal, my car went out of limp mode, all messages disappeared for good.
At the time this happened, I already made some phone calls and found used computers on several junkyards ranging from 130-250 USD.
Good luck,
Alex.
Turned out it was oxidation on the computer's circuit board that turned up all those messages. Once I took it out, dried it and put it back, everything went away.
Since you don't mind looking in, you may want to open the passenger side fuse box under the hood and inspect the transmission computer.
My issue occurred also after a car wash, I was sorry that I did not open and dried the computer until a week after this happened, as by then, half of the board was oxidized. I had to clean it with alcohol and dry it up, after which everything went back to normal, my car went out of limp mode, all messages disappeared for good.
At the time this happened, I already made some phone calls and found used computers on several junkyards ranging from 130-250 USD.
Good luck,
Alex.
Thread Starter
Member
Joined: Jun 2008
Posts: 215
Likes: 6
From: San Diego
2012 CLS63 AMG Performace - Obsidian Black
No issues with TCM. Skylaw, on the battery, which I'm pretty sure is close to new (a 1000+ CCA AAA Battery), do you remember the button sequence to go to diagnostic mode and read the battery voltage on the display?
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Joined: Dec 2004
Posts: 3,063
Likes: 27
From: Tampa, FL
2005 S500 4-Matic, 1978 450SL
See http://www.benzworld.org/forums/w220...ic-choke.html; I use a fairly decent battery charger with some diagnostic functions, though. It takes more than a voltage readout to test a battery. See http://www.benzworld.org/forums/w220...ttery-die.html for some techniques.
Alkemist had some very good suggestions that may be more likely than the battery.
Alkemist had some very good suggestions that may be more likely than the battery.
Last edited by Skylaw; Jan 10, 2010 at 07:00 PM.
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Joined: Aug 2002
Posts: 1,005
Likes: 33
From: Germany
'00 S320 W220, '98 A160 W168/ sold in 2005 '86 260 E W124 '90 260E W124
In your post you mentioned BAS and ABS failure after car wash, but in the text you referred BAS and ESP. What was it finally? I had this for months BAS&ESP very sporadically. No clue what caused it. But as already said one cause for ESP and BAS fault to show, is a low (or no) battery voltage <10V for a short time. But to reset this warning you only need to turn the wheel 1-2 time from far right to far left, and the warning goes away. You need to recalibrate after a battery swap the same way. If the warning remains and only goes away (for some time) if you restart the engine, there are two more possibilities, one is the brake switch gives wrong signals or the so called "membrane Travel Sensor" (it is a sensor attached to the power brake modul). This sensor measures the travel of the power brake membrane over time, and activates the BAS (brake assist) if required. Both the causes can be read out by the Star Diagnosis of the MB-dealer. After 4 months personally fiddling with the ABS sensors, the ESP/ABS control block connectors, newly insulating the harnesses........I went to MB and in no time the "membrane Travel Sensor" was identified as the culprit. 1 hour and $200 later everything worked fine.
Thread Starter
Member
Joined: Jun 2008
Posts: 215
Likes: 6
From: San Diego
2012 CLS63 AMG Performace - Obsidian Black
No issues- I had my Indy look at it, and it looks like I had some interference with a wheel sensor. He told me that a very high pressure jet of water, sideways into the wheel, can sometimes cause issues, but who knows... No problems now.
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Junior Member
Joined: Sep 2006
Posts: 56
Likes: 2
From: Россия
2005 S500 4matic
Hello all, and Happy New Year! Odd little problem today, and it reset itself after a start-restart. After going through a no-touch, fairly high pressure car wash, the BAS ESP Visit Workshop warning came on after my first start (I had gone to Wallyworld, got some goodies, and got the warning on restart).
The ABS module is new according to my VMI, as are most of the brake components. I would assume that one of the ABS sensors got wet, but is this common? Rather odd... Anyway, I keyed off and re-keyed it, after turning the wheel full travel, and no warning...
I don't mind when stuff breaks, because that means its fun time in the garage for me, but intermittant stuff? Grrrrr.
Anyone else?
The ABS module is new according to my VMI, as are most of the brake components. I would assume that one of the ABS sensors got wet, but is this common? Rather odd... Anyway, I keyed off and re-keyed it, after turning the wheel full travel, and no warning...
I don't mind when stuff breaks, because that means its fun time in the garage for me, but intermittant stuff? Grrrrr.
Anyone else?
So YES these sensors have terrible design. They malfunction once every year and kill all the security and safety of your vehicle.
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MBWorld Fanatic!
Joined: Dec 2004
Posts: 3,063
Likes: 27
From: Tampa, FL
2005 S500 4-Matic, 1978 450SL
The first link included the semicolon after it as part of the URL. The correct link is http://www.benzworld.org/forums/w220...nic-choke.html
The second link - http://www.benzworld.org/forums/w220...ttery-die.html - works just fine.
The second link - http://www.benzworld.org/forums/w220...ttery-die.html - works just fine.
