Question about 2002 Mercedes-Benz M-Class

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ML270, multiple warning lights

I have a ML270, I stopped and the lights and kept my foot on the brake... all hell broke loose. The ASB,BAS,ESP,4-ETS and EPC all started flashing with a warning beep. This continued on and off until I got to a dealer. Diagnostics only reported a voltage drop and it was suggested i change the battery. Is it really that simple?

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  • 778 Answers

Yes it could be that simple and probably is.

Posted on Jul 03, 2009

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I have a 2000 Mercedes E430 base sedan. Last week I replaced the brake light switch because it was out and it solved the problem to the point that I can now put my car into gear and drive it, however, as...


Brake light switch problem may cause the ESP / BAS lights to illuminate.

Common symptoms of a bad
Mercedes brake light switch.
  • Car stuck in Park.
  • ABS ESP ETS lights come on.
  • Can not move the shifter from Park to Drive.
  • Brakes Defective Warning on Instrument Cluster
  • Car won't shift gears. Stuck in 2nd gear, limp mode.
  • Brake lights don't work. (Brake light switch can still be defective even if the brake lights work. Checking the brake light operation is not a good test.)
  • ESP, BAS, ABS lights turn on. Car won't shift properly. Stuck in gear.


TEST: To test your new brake light switch: Turn you car off to reset the ABS light. apply the parking brake. and start the car in neutral or park without using the brake. if the problem is the brake light switch... the light will only come on when you press the brake pedal.

If you replaced the brake light switch and the light is still on you should check a few other things such as:

  • Fuses and Relays
  • ABS pump
  • ABS wheel speed sensor
  • Brake Fluid Level
  • Get an advanced scanner to read trouble codes.


NOTE: ** You may need a MBZ scan tool to reset the error code which was stored in the ECU because of the bad brake light switch.

Feb 25, 2015 | 2000 Mercedes-Benz E-Class

1 Answer

My esp/bas light stays on


the operators manual is clear on that, did you read that first?
it says "get the car serviced" clearly
if you work on cars, do you? thne we scan the systems with the scan tool first. to see if there are complex hard errors.
like the ABS sensors, (not bas) sensor dead. (ops a road hazard hit it and broke the wire there, dang.
then if no hard failures.
first is not ESP (that be last dead last)
the first is , the brake must work perfect if not , the ABS can not
work correctly with bad brakes.
so check fuses.
scan ABS for errors
then do a full brake inspection, takes me 2 hours. but my guess,
youve never done brakes, right,, your self?
not even a full inspection?
  1. leaks? (fluid)
  2. pads worn out?
  3. caliper pistons not sticking
  4. rotors not cracked, or wrecked, surfaces.
  5. caliper guide pins not seized. (they float free?)
  6. emg, brake not sticking on partially?
  7. wrong sized tires on car (or just one , omg)
  8. ABS sensor parts damaged at axles ends.?
  9. bad wheel bearing, seizing or loose.
etc... etc.... and more.

Feb 05, 2015 | 2006 Jeep Grand Cherokee

2 Answers

ASB,ESP INOPRATIVE


All you have to do after replacing the battery and the bas/esp light comes on is drive the vehicle. While your driving around is will allow the steering angle sensor to relearn. That's only if it says "bas/esp see owners manual" displayed on the cluster.

Sep 20, 2012 | 2007 Mercedes-Benz C-Class

1 Answer

Esp warning light and bas on


Hi there:
The BAS/ESP lights pertain to your brake assist and electronic stability systems. One of the more common problems we find is a faulty stop light switch or a steering angle sensor. It would be a good idea to have the fault codes read. The codes would give you a pretty good idea as to what is going on. You could try to initialize the steering angle sensor first. This is normally needed after a dead or weak battery condition. To do this you'll need to start the car and then turn the wheel slowly all the way to the left, pause and then turn slowly all the way to the right, pause and return to center. You may need to do it a couple of times to initialize the sensor. The stop light switches are inexpensive and easily replaced. They're located under the dash at the brake pedal. When you get your new switch you'll see a little release tab on it. You just depress the tab and rotate the switch 90 degrees to remove it.


Before to replace some parts, I suggest scaned the computer car in order to know other fault codes stored.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day

Jul 06, 2012 | Cars & Trucks

1 Answer

Volkswagon Passat 2005 - driving home from work and the handbrake warning light comes on followed by the annoying alarm. Turn slightly left it stops then the ASB warning light comes on followed by the ESP...


This sometimes is triggered by the MAF(Mass Air Flow Sensor), try cleaning it with the highest percent isoproply alcohal first, do not touch the sensor with anything use a big bag to soak it into, or just replace the sensor.

Mar 29, 2011 | 2005 Volkswagen Passat

2 Answers

ESP/BAS WARNING LIGHT COMES ON AND STAYS ON SOME TIMES. HOW DO I KNOW IF THE ESP IS WORKING


If the ESP light is on, the system is not functioning. have your dealer look at and replace your Brake Light Switch

Dec 06, 2009 | 2006 Jeep Grand Cherokee

1 Answer

Hi, Driving home the BAS/ESP light came on and will not go off. Car seems sluggish and slower than normal. ML270, 7 seater. The car has been in and out of garage since we bought it, they ar not very...


you need a Brake safety switch replaced.This is located behind you brake pedal. it's a common problem. The warning lights will reset after a few engine starts.

Oct 01, 2009 | 2002 Mercedes-Benz M-Class

1 Answer

I have two orange warning lights on the dash- BAS ESP and ETS. Things are running fine? 2001 320ML


My Benz did the same and the cruise control would cut after a short period of time. If this is also happening to you,you need a Brake safety switch replaced.This is located behind you brake pedal.Go by a local Mercedes mechanic they should have one it's a common problem. You can put it on your self if you can screw in a light bulb! The warning lights will reset after a few engine starts.

Sep 25, 2009 | 2002 Mercedes-Benz M-Class

1 Answer

ETS light stay on all the time.


ABS--BAS--ESP
The Electronic Traction System uses you ABS tu assist in stability

Most likely cause is the 'stop lamp switch'
It is a electric switch located on the brake pedal inside the car, about half way up on the brake pedal.
Pretty cheap too, I think the switch is only like $25 bucks.
2 connectors on the switch and then it turns out.
hope that helps

Jun 26, 2009 | 1996 Mercedes-Benz C-Class

1 Answer

Warning Light on Mercedes ML270


Hi,

To my understanding:
BAS ESP - Electronic Stability Program (keeps you moving in the direction you intended the vehicle to go); probably a faulty brake switch or a bad brake sensor. You may want to reference this forum for additional insights;
ETS - Electronic Traction System (keeps you moving); would require an appropriate code reader to diagnose and pinpoint problem.Surprisingly, there has been some reports of defective brake pedal switch that activates this warning. You may lilkewise want to reference this forum for additional insights.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

Jun 06, 2008 | 2002 Mercedes-Benz M-Class

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