ASR, ABS and BAS not working. C230k 98R

[Timbo]

Hi everyone,
just read the recent post about a similar problem and checked out the links, but I don't think I have a problem with the brake light switch. Drove home on friday night, appauling weather very wet, brakes etc ok. Went to start the car this morning and the ASR, ABS and BAS lights don't go out, checked to see if the ABS was working and it isn't. I would be very grateful for any ideas befor I go to the dealer?

Thanks, Tim

 

[Ian B Walker]

Tim for £7.62 a brake switch change would not hurt and I just bet that it will cure your problem.

W210 similar symptoms, cured.
W211 similar symproms, cured.

Try it, I would.

 

[television]

As Ian says, just change the brake light switch and all of your problems will go.

Malcolm

 

[Timbo]

Thanks for the advice, and I will try it. However, murphy sits on my shoulder and he says you're not going to get away with it that easily, particularly as my brake lights work fine and the problem arose suddenly with out the use of the brakes. I wish I could be more optomistic but a life time of experience has made me otherwise, thanks again, any other suggestions welcome.

Tim

 

[cobra427]

try this one...

http://forums.mercedesclub.org.uk/showthread.php?t=19574

 

[daverh5]

Hi there; I had the same problem after I let the wife drive my baby.
The next morning I got in the car and the abs,asr and bas light stayed on after startup, after thinking the worst I got the owners manual out and it said with the engine running turn the steering wheel full lock left and then right and back to centre and it worked.
the cause was my battery getting drained with the high consumption of winter; new battery no more probs.

 

[television]

A big snag on these threads is that often the ABS light is mentioned when in fact it is the ESP lamp. though the brake light switch will cure the ESP/BAS faults it will not correct an ABS fault, the ABS is the base system, The ESP/BAS make use of this, and run on top of this, so that with a ABS fault you will also have no ESP or BAS.

Just to help others understand why the brake light swtch fails, and has nothing to do with the brake lights, a very small leakage accurs within the switch, too small to stop or effect the brake lights,but enough to kill the speed signal in the SAM.

With batteries and a new one clearing the fault, what happens here is that when a battery is partial short circuit on one cell the voltage drops to around 10v-11.75. Though the car and the ABS runs on the alternator,the voltage is held down from the running 13.8v to the low battery voltage.

Hope this helps a little. Malcolm