Question about Mercedes-Benz S500

3 Answers

BRAKE LIGHTS STAYS ON. the swith isnt the problem.

Mercedes S500 brake light stays on. I changed the switch and it didnt help. could it be something else.The car also starts without me pressing the break first.

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  • MASE May 24, 2012

    brakelights and tail lights stay on when I start the car and while driving

  • MASE May 25, 2012

    i went to auto mecanic who replaced the switch, But the brake lights still are on.The mecanic also states that the car starts without having your foot on the brakes.if the car is off the brake lights are off, but if the car is on the break lights stays on. What else could it be? please help. could it be a transmitter is so whats is the part name and number. thanks

  • Anonymous Jan 24, 2019

    We see this all the time on W215/W220 models - Brake lamps are on anytime the key is in position '2' -  In STAR/Xentry, it's easy to check the operational status of the brake lamp switch. It is also easy to check the signal status of the Rear SAM. In almost every case, we replace the ESP/PML/BAS control unit and the problem is solved. Leave the key on for 15 minutes. The ESP/PML/BAs control unit will be hot to the touch with this type of failure...

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This can be a bad relay for brakes, brake signal return wire is short to positive known as ( cold short ) best disconnect the plug from the brake switch use a test lamp and check if you have power on both wires if not your output wire from the relay terminal 87 is short to positive

Feel free to ask fixya

Posted on Jan 24, 2019

  • daniel k nakwafila
    daniel k nakwafila Jan 24, 2019

    This can be a bad relay for brakes, brake signal return wire is short to positive known as ( cold short ) best disconnect the plug from the brake switch use a test lamp and check if you have power on both wires if not your output wire from the relay terminal 87 is short to positive

    Feel free to ask fixya

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You SHOULD be able to start car without depressing brake pedal. Just not shift into gear without brake.

Posted on Jan 24, 2019

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  • Mercedes-Benz Master
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If the car thinks the brakes are on, then the switch on the brake pedal lever under the dash is bad. But this switch is not the only switch you have. IF your system works like the Ford products I am use to, then another interlock is present to prevent you shifting out of Park without pressing the brakes.

If you are able to shift without your foot on the brake, you are still getting a signal to the second interlock with the trans. This means the brake pedal switch is saying your foot is pressing the pedal. Some cars are in the data base for Autozone.com. If you can register your car for free, most will have free wiring diagrams and fusebox layouts.

You may have a relay for brake lights on a Mercedes. Other cars usually do not because it affects reliability. But a stuck brake relay could keep the light circuit on, if equipped.

A better scanner can do brake functions and all you need to do is plug in the tester to the ABS port and see if the abs is identifying a problem. The cheaper scanners do not have this feature.

A remote possibility is that you have a bad Master cylinder and the pedal is not returning to the full upright position.

I hope my solution is helpful.

Posted on May 25, 2012

  • Victor
    Victor Sep 27, 2018

    Only my third break light stays on, and the top tail light on the driver side , is on but very dim and is flickering. It will turn off when I unplug it from u see the back seat. Also my s shade goes up on its on ,can anyone help.

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Posted on Jan 02, 2017

shop242
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SOURCE: maintenance light and brake lamp light what does it mean

The Maint Req Light is only a reminder light to get the Oil changed and fluids checked and what nots.. Its on a timer that must be reset.. Its no big deal if ya had it seviced recently.. Heres how to turn it off: 1) Make sure Key is Off 2) Press and Hold Mileage reset button. 3) While Holding Milelage Reset button, swicth car to run, but dont crank..4) Continue to hold button until light flashes and goes off.. then switch it off .. Start the engine to make sure it worked.. Sometimes ya gotta do it twice.. NOW.. And ur Lamp indicator.. Means you probably have a brake light or turn signal bulb out on the rear.. Get someone to help ya look for that.. Lemmie know if this works.. and Take care.. Thanx

Posted on Mar 11, 2009

  • 174 Answers

SOURCE: Brake lights stay on

check the brake light switch on the pedal

Posted on May 24, 2009

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