Brake lights stuck on
Thread Starter
Newbie
Joined: Aug 2016
Posts: 1
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mercedes s500
Brake lights stuck on
I have a 2002 Mercedes s500 and when I turn my lights on or even if there off my brake lights don't turn off like I have my foot on the brake constantly so I was thinking maybe I need to change my brake light switch I do that and still lights do the same thing stay on so I checked my brake lights I noticed I have one of my tail light bulb out so I check and it's the led lights that stay on I need help please
Super Member
Joined: May 2016
Posts: 516
Likes: 26
From: California
2018 C300
So, if I understand, your brake lights are illuminated, even when none of the tail lights are supposed to be illuminated. If it's on both sides and on the rear center high mount, then I would agree it sounds like the brake switch. If it's only one of the lights, I'd be inclined to say it's corrosion of the wires or housing. As whenever anything electrical comes up, make sure all of your drains are working properly and that water isn't getting to places it's not supposed to be.
Junior Member
Joined: Sep 2017
Posts: 25
Likes: 3
2007 S600
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...
MBWorld Fanatic!
Joined: Jan 2008
Posts: 6,151
Likes: 533
Mercedes
the headlight switch needs to be straight up and down to turn the lights off
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Member
Joined: Nov 2014
Posts: 167
Likes: 22
2003 CLK500, 2008 e350
I plan on checking the rear SAM today. I pulled the connectors off the brake switch yesterday, sprayed both sides with electronic cleaner and plugged them back in. Seems like it solved the drivers side taillight problem, but the middle brake light still stays on. Ironically, after cleaning the brake light contacts, everything worked great, i.e., the drivers mirror turn signal indicator fully lite and worked, all of the "check taillight, license plate lights, etc" messages on the dash disappeared. I plan on checking the rear SAM today.
