Question about 2007 Mercedes-Benz ML320 CDI

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MY 2002 MERCEDES BENZ E320 BRAKE LIGHTS STAY ON

MY BRAKE LIGHTS STAY ON WHEN I START MY CAR TRIED TO UNHOOK THE BATTERY CABLE DIDNT WORK ALSO MY POWER WINDOWS DONT WORK EITHER BOTH HAPPENED SAME TIME.

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  • jim reynoso Jan 13, 2009

    WELL I NEED MORE DETAIL IN FIXING MY PROBLEM PLEASE.

  • jim reynoso Jan 13, 2009

    NO I CHECKED THE FUSES ALREADY ALSO I HAVE NO SWITCH ON THE BRAKE PEDAL OR BEHIND IT

  • jim reynoso Jan 13, 2009

    NO THE BRAKE LIGHT GOES OFF WHEN I TURN OFF THE CAR

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7 Answers

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That is a contact on the brake light wirings.

Posted on Jan 23, 2009

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Welcome to Fixya! You ultimate Problem is a Relay Switch. The Brack lights Staying on is a Computer Code sent from the Faulty Relay to let you know that there is a Problem. These other Solutions will work on Ameriacn Vehicles Not a Mercedes Benz. You will have to get it Hooked up to a Diagnostics Machine to Locate the Faulty Relay. Mercedes are VERY Difficult to Diagnose when you are not there in Person. Let me know if you need further Assistance!

Posted on Jan 13, 2009

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As silly as this sounds. When you press your brakes, your brake switch shorts out causing your brake lights to come on. Pull the plug off the switch. If the lights don't go out, live chat me. i was a mobile electrical mechanic once. If they went out, check alignment or replace the switch. If this is helpful, please post as such

Posted on Jan 13, 2009

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Hi and welcome to FixYa,

Initially, there would be two (2) brake lights you may be referring to, internally, on the dashboard and the rear. if it were on the dashboard, it could refer to:

  • hand/emergency brake partially activated or a defective handbrake switch (least likely);
  • brakepads have worn off and would need replacement soon (likely);
  • the brake fluid in the reservoir needs a refill (most likely).
If it were on the rear, then:
  • it could only indicate a faulty brake light switch which is coupled to the upper portion of the brake pedal. This switch is normally open and kept that way with the use of a return spring. If the spring is missing, misaligned, unhooked, then the switch would turn itself on and therefore rear brake lights would engage.
Check and perform preliminary visual or necessary inspection. Pls post back result(s). Good luck and Thank you for using FixYa.

Posted on Jan 13, 2009

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 mis adjusted brake light switch could cause that fault. check the wiring connections.

Posted on Jan 12, 2009

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Hi!

Check for the fuses in the fuse box. Also try to check the connections with the battery.
Thanks

Posted on Jan 12, 2009

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  • Rylee Smith
    Rylee Smith Jan 12, 2009

    There may be water in the fuse box that is keeping your lights on. This will drain your battery very quickly

  • Rylee Smith
    Rylee Smith Jan 12, 2009

    It's probably the switch. Crawl up under the dash and and look for a wire running near the top of the brake pedal stalk. Look really close at it, many switches have an adjustment to control how far the pedal must move away from the switch before the plunger extends which turns on the light. It's possible the switch has shifted or it may be broken/cracked.

  • Rylee Smith
    Rylee Smith Jan 12, 2009

    Try sticking your toe under the brake and lifting up. If the lights go out it is definitly the switch.

  • Rylee Smith
    Rylee Smith Jan 12, 2009

    Manually pull up on the brake light switch to deactivate it until you can get it repaired. This method will only work if the brake light switch is just sticking. Otherwise you will need to open the hood and disconnect the negative terminal of your battery each and every time you leave the vehicle unattended to keep the faulty brake light switch from draining your battery.

  • Rylee Smith
    Rylee Smith Jan 13, 2009

    Hi!



    There are no fuses near the brake pedal however depending on the year make and model the brake light switch could be in a couple of places. Most likely it is under the dash, mounted on a bracket near the arm that the brake pedal is mounted to. This switch controls your lights so that when the pedal is pushed, the contacts on the switch transmits the electricity that lit the brake lights. Sometimes that switch is loose or something is jamming it.

  • Rylee Smith
    Rylee Smith Jan 13, 2009

    And, if the brake lights stay on with the switch disconnected it is probably a relay. Look for them in a black plastic box either under the dash or under the hood. Hopefully they will be labeled. Remove the relay. If the lights go out replace the relay, if they stay on it is most like a short circuit.



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Check your fuses and see if any of them are burnt.if so replace them on the brakes i thinkg you have a stuck brake light switch which is eith in front of or behind the brake pedal

Posted on Jan 12, 2009

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