Question about 2008 Mercedes-Benz ML 350

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I have an 2008, ML350 and the third brake light is on and killing my battery every night. Is there a fuse I can change or is it the module?

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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s_pra_army
  • 37 Answers

SOURCE: Third brake light flashing when engine is off, no main brake lights

this does not sound like a fuse problem. seems like a wiring issue. You probably have wires shorted together, and/or shorts to ground somewhere.

Brake switch is a good place to start, make sure it's working fine. To find the wiring issue you will need electrical diagrams, so get yourself a repair manual for a 1998 Explorer.

Look at connectors, see if you can find components or connections where all the brake light and tail lights connect to together. Using a multi meter you should be able to pin point the issue if u follow the wiring from the battery to the lights using the diagrams and checking connectors.

Posted on May 09, 2009

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keithheavili
  • 410 Answers

SOURCE: brake light and stop brake light stay on after car is turned off. This is killing the battery. Tried changing the 15 amp breaker under sterrting column

Your brake light switch is eith stuck or gone bad.  It is located on the brake pedal and you can try to jiggle it to see if it will free itself and turn the lights off or you will need to replace it.  It's a pretty easy job and relatively inexpensive.  Let me know if you have any other questions.  Thanks for rating my response and for using FixYa!

Posted on May 28, 2009

  • 66 Answers

SOURCE: How to replace and change the third brake light (

there should be a screw on either side of the black plastic case, after that it is simple

Posted on Aug 12, 2009

  • 1645 Answers

SOURCE: 2004 chevy 1500 brake lights not working

check fuse under hood, batery terminals coroded wire at harness if everything fails run a hot wire to rear brake line with an interuptor.
check the swich under the foot brake.
vitally

Posted on Sep 09, 2009

drsinister69
  • 2317 Answers

SOURCE: my brake lights dont work but the tail lights do.

Check the brake light sockets and wiring for the brake light circuit.

Posted on Mar 06, 2010

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2008 Chevy Malibu check engine light and traction control light is on but im not losing power. also third brake light is out was working fine earlier.


Check engine light on ? Have it checked for DTC'S - diagnostic trouble codes . All problems maybe linked together . If you don't want to take to a qualified repair shop , auto part stores will check codes for free ,most will ! i hear advance charges $20 now. Third brake light may just be a bulb or the Stop lamp relay in the under hood fuse box.
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The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.

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First, check to see if your ABS and your TCS fuses are good. A lot of times, if both lights come on, it senses a failure in the braking system. Your vehicle will disable the abs if it finds a problem in the braking system, hence the red brake light/hand brake light coming on in the dash. Get a code scanner that also reads the abs module. You could have a bad wheel sensor, which is tied to your TCS and your ABS system. Either that, or you ABS module could be bad.

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The body control module (BCM) is responsible for controlling the stop lamps. When the driver presses the brake pedal, the BCM will receive a signal from the brake pedal position sensor. The BCM then supplies battery positive voltage to both left and right stop lamp assemblies and to the center high mounted stop lamp (CHMSL). The stop lamps are grounded at G401 and G403. The CHMSL is grounded at G302.
Did you check the blub , is there power ( B+) at the third light ? Is the ground G302 good ? Do you have a DVOM - digital volt ohm meter , do you know how to use one ? Do you know what voltage drop is ? an know how to test it ? Check the stop lamp relay in the under hood fuse / relay box.
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Why won't my MB ml350 brake lights work even after i install new bulbs?


Did you check the fuse? Either the fuse may be out, or the brake light swith on the brake pedal may be out or need adjusting. You should have 12 volts at the brake switch.

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1 Answer

Abs relay


Good Day,

The easiest solution is to locate the abs fuse in the fuse box. Remove that fuse and ABS is now disabled(this will trip you abs light), brakes will function normal but keep in mind you will lock the wheels up under heavy braking. Possible cause are bad abs sensors, or bad abs module. If you don't mind no abs then problem solved, otherwise take it to a shop and have a code pulled from the abs module to diagnose further.

Hope this helps and Good Luck

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