1995 S500 Sedan - 72000 miles. ASR went into Limp-Home-Mode while braking out of turn into car-wash track. No ASR light on unless ASR-Switch actuated. No light in ASR Switch. Repair shop says constant power to throttle body even with key off and removed. Wants to removed several items and send them in for testing/repair - estimates $2k to $3k for repair. Help

you may not be avail to disable, actually let me re-frame that, when the light is on the system is disable, limp mode.
is hard to do with out a scanner, but if you have one, replace your brake switch, and reset the light. the brake switch controls the ASR/ BAS/ STABILITY CONTROL/ THE CRIUSE CONTROL. CHANGE IT WILL FIX YOUR CAR.

Someone must fix the actuator system. It is hydraulic, means it has a master and slave cylinder like a small brake system. One of them has a bad seal and has sprung a leak. Parts are available at parts stores, not too expensive but kind of a hassle to put in and bleed.

Suspect idle control motor, although mass air flow sensor problems have sometimes been related to idle surge. Have pcm codes pulled for further diagnosis.

Open the bonnet area, you will find the master switch on the upper left area, turn it OFF (right). After one minute, put the ignition in POS 2 without starting the car, leave for 30sec, start the car BUT leave idle for 10 minutes.

turn off car and unscrew the throttle cable a little bit then start it up again. ASR is finicky if it feels pedal is being depressed on startup it goes into "limp home" mode.
Have you had your engine upper and lower wiring harness replaced? From 1991-1995 MB was forced to use a biodegradable insulation that went bad under the hood due to engine heat.

yes they can but unlikely-more likely a bad over voltage relay(powers up idle speed computer) or wire harness-your vehicle is probably a hfm type fuel injection they changed from lh that year. find out if it is lh check the fuses in the base module located in the passenger side of the engine compartment under a cover held in by 4mm allen head bolts-alot of times these control units have intermittent contact with there connectors. asr stands for acceleration slip regulation-both isc and asr communicate via can system to monitor throttle position- ea isc cc-idle speed cruise control and electronic actuater(throttle)-hopefully i have helped

hello,good day,you can erase (using hht or star) but might be back again,part tobe check,,engine wiring harness,ldling actuator,sensor,connection,better to send your car to a dealer,they have diagnosis manual to guide them step by step,special tool like diagnosis cable,contact box and a simulator,this step can pin point the defective part,ty

When this happens, usually you have to replace the Computer. There is a chance you just didn't reset it when you took to cables off. Remove them and tape or hold them together for 5minutes or longer. If it still does it, I would get a book and find out where the code is to lead you. With the obd it only gives you a starting point in the diagnosics. You may have air in your lines that need bled, a sensor out, or just plain adjustment of the cables. But it shouldn't go into limp home mode unless you lost your Engine Control Monitor. Oh, I didn't click the read more button. Check the E-brake cables. You may have run over something that hooked it and ripped it loose. The Jags can tell if the cable is too far out of adjustment. It's under the car, cable should go through the floor and run to the rear of the car and Y out to the rear wheels. Good luck.

The ASR (acceleration slip regulation) light is for the ETA (electronic throttle actuator) it is a mysterious beast that controls throttle placement. I would say that you have one of two problems. Either the interior insulation of the wiring of the ETA is is crumbling or the wiring harness is disintegrating. Either fix isn't cheap although if I had to pick one I'd pick the wiring harness. It's about a third of an ETA. In short check he wiring to the ETA, look for damage or water intrusion, if nothing is found you will have to replace the ETA control.
READ THIS POST FROM A M-BENZ FORUM MEMBER ON ASR ISSUE
For two years I lived with the the ASR light coming on shortly after starting the car and had to either continue driving it in the limp home mode, or stop the car to restart it to regain normal engine operation with the ASR light out. Finally, it got so bad I simply took a chance, after discussing the problem with a reputable local indie, and bought a rebuilt ETA from Potomac German Auto and put it in. The part had a one year warranty with it and was about half the cost of a new unit from MB. There are other companies out there that rebuild these units as well. At any rate the ASR problem went away. To give you a reference point, my car had about 156,000 miles on it when I did this repair. That may or may not be significant to your situation, and I probably should have corrected this problem well before I did, but I didn't.