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ABS, BAS, ESP lights on
On my 2001 E55 the ABS, BAS and ESP lights all came on when I started the car and it says "Visit Workshop". The ABS pump was running constantly and continued to run after turning the car off. We had to unhook the connection to the solenoid pack that connects to the ABS pump to stop the unit from running.
Based on a few posts here and a Google search it appears that this is a somewhat common problem on the M Class. For the M Class the fix in some cases was to replace the ABS pump relay (K25). Another cause on the M Class based on modulemaster.com is a bad solenoid pack attached to the ABS unit. My E55 has a similar solenoid pack but does it have an ABS pump relay somewhere? If so, does anyone know where that is located or if you have solved a similar problem on a 210 series, how? Last edited by Bob I; 12-20-2009 at 09:24 PM. |
#2
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On the W210 chassis the relay is part of the relay module K40 located in the computer box at the RR engine area.
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MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#3
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You may also want to examine the brake light switch. It is located just above the brake pedal. Part is in the $20-range, so this may be an inexpensive first step that may fix your problem. Bad switches have been known to trigger the ABS/BAS/ESP light. Good luck!
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ARVY 1999 E430 1999 C230 Kompressor 1992 300E (write-off) 1984 190D 2.2 (sold) |
#4
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M.B. Doc:
Thanks for all you do on this site. Would a bad K40 relay cause the pump to run with the key removed or is that more likely a problem with the solenoid pack that connects to the ABS pump? arvy: I think the brake light switch triggers these lights but will not cause the ABS pump to continue running with the key off and removed. |
#5
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Yes, the K40 relay is the only thing that could allow the pump to run with key OFF.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator |
#6
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Thanks for the help. I'll let you know how the relay replacement worked.
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#7
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Replaced the K40 relay over the weekend. It stopped the ABS pump from constantly running and ABS etc. is now working as it should. The most difficult part was removing all of the connections that had been in place for 9 years. The Mercedes part comes with all of the fuses which is nice. At $80 list price for the relay, this was a surprisingly inexpensive fix.
Thanks for the help. |
#8
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Just wanted to post the solution to my ESP/ABS/BAS problem.
After trying the brake light switch to no avail, I had the codes scanned at a local indy shop and the lateral acceleration sensor had thrown a code. This module is part of the ESP system and is located under the carpet beneath the driver's seat. Believe it or not Mercedes wants > $2K for this module! I found it on a German used parts website for < 50 Euros I finally got it replaced today and the annoying beeps and lights are gone It's MB part number 000 542 65 18. good luck! |
#9
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Quote:
From this source, price is about $16.00. Is this same part as the $80 dealer part?
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#10
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The K40 relay is the complete unit shown in the photo from post #7 with the part # A 000 540 00 72. Since it comes with all of the fuses etc. it is one of the more reasonably priced MB parts. There is no photo for the part in your link but I think it is for a smaller individual relay. After I posted my fix I had the lights all go on again within a few weeks. At that time my mechanic thought there was something else funny going on and traced the problem to a small relay elsewhere on the car. I don't remember where exactly it is at but he had an old one is his tool box. That was used as the replacement and it has been working fine ever since. I ordered extra relays to replace the part for him and also to keep one for a spare. The original part number I ordered was 0025427219 and I was told that had been replaced by 002542721964. This relay has been used in numerous places on MB cars for many years. It will show up as for convertible tops, ABS and many other electrical uses. The MB list is around $50 but there is a Hella part available from Phil. You might want to see what he shows for these part numbers. It should look like the photos attached. We never did figure out why replacing the K40 relay initially fixed the problem. The small relay that was finally replaced was not on the K40 relay though.
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#11
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Quote:
I have read that relay 0025427219 had been used as a replacement for 0025421319. Not sure what the 64 suffix does - maybe a higher current rating? If you could find out where the second replacement relay was located, that would be helpful. Another question: Is there a reason to change the complete K-40 instead of just the relay. In other words, is there something more that could be wrong other than the relay or fuses? Yet another question: The K-40 is called an OVP - Overload Protection Relay. Does the relay on the K-40 operate the ABS pump?
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#12
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Bob,
I checked the epc and it seems my 98 W210 doesn't use that 0025427219(64) relay. It uses A0025421319 for the K-40 relay (Right Rear engine comp) and for the fuel pump (under back seat). I thing epc said there were 3 - not sure where the other one is.
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
#13
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Graham,
If I understand things correctly, the K40 relay is the whole unit I pictured in post #7 and has part #A 000 540 00 72 stamped on it. I attached a file of what I think is usually referred to as the K40 relay on the 210 series. I am not an electrical engineer or trained MB technician but there appears to be some relationship to the ABS system and the complete K40 relay unit. Your EPC check agrees with what I said previously - the small relay, part #0025427219 has been replaced by #002542721964. Searching for part #0025427219 on another site shows it as being for the fuel pump. On MB dealer sites 0025427219 still shows up as a relay and 002542721964 is listed as a contactor so both part numbers seem to be valid. I'm not sure why I was told that 002542721964 superceded 0025427219 unless it was only for my AMG model. I will look under the hood this morning and see if I can remember what the last relay we changed was. I don't think it was part of the K40 relay though. Since replacing a small relay finally fixed the problem, I might have been fine keeping the K40 relay I had. |
#14
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Graham,
Was your ABS pump running constantly along with the ABS, BAS & ESP lights indicating a malfunction? I now see where some of the confusion in coming from. There is a relay #A 002 542 13 19 on the unit I am calling the K40 relay on the passenger side of the car. The relay that I ultimately replaced that fixed the problem was also #A 002 542 13 19 but it was behind the fuse box on the driver's side. We determined that it was causing the problem because when it was pulled with the ABS pump running, the pump stopped. I have attached photos of the fuse box covered, with the cover off, and with a close up of the back section containing a number of relays. There are six screws that need to be removed to get the cover off. The relay #A 002 542 13 19 is the black one on the right side in image 924. If your pump runs constantly, try pulling this relay to see if it stops. I also dug out my spare parts and compared the #A 002 542 13 19 original relay to the # A 002 542 72 19 64 that is supposed to be a replacement number. The size and prongs look the same but the plastic cases have different attachment tabs. The tabs aren't used in either location but I wonder if these numbers are actually interchangeable. |
#15
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Quote:
My pump doesn't run continuously. In fact it may not run at all. I have ordered one replacement 13 19 relay. I may try it first in the K-40 relay and if that doesn't have any affect, then try it in the other location. Appreciate your input!
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Graham 85 300D,72 350SL, 98 E320, Outback 2.5 |
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