Question about Mercedes-Benz S500
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.
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
You SHOULD be able to start car without depressing brake pedal. Just not shift into gear without brake.
Posted on Jan 24, 2019
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
Save hours of searching online or wasting money on unnecessary repairs by talking to a 6YA Expert who can help you resolve this issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
Here's a link to this great service
Posted on Jan 02, 2017
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
Tips for a great answer:
Jul 29, 2014 | 2003 Mercedes-Benz S430
May 31, 2014 | 1996 Honda Accord
Aug 20, 2013 | 1998 Mercedes-Benz E-Class
Nov 18, 2011 | Mercedes-Benz Cars & Trucks
Sep 29, 2011 | 2001 Mercedes-Benz S-Class
Feb 21, 2011 | 2002 Audi A4
Jun 05, 2010 | 1991 Chevrolet C1500
Mar 08, 2010 | 2001 Mercedes-Benz CLK-Class
2,412 people viewed this question
Usually answered in minutes!
Step 2: Please assign your manual to a product: