The right rear light completely works until the headlights come on, or I turn the day-time running lights off. It appears to be an electrical issue or perhaps a fuse.
SOURCE: 1993 Mercedes Benz 300E, right rear squeak
Common causes for High-pitched noise from rear wheels are:
The wheel bearing: this is not usually dangerous in the short term, but I recommend contacting a mechanic and having it fixed. To test the wheel bearing, you lock front wheels, and jack up the car rear and spin the wheel (handbrake unlocked). If bearing is worn you hear a drone. When is the bearing, often car starts vibration above 40 mph.
Noise from bearing can be continuous, intermittent, only when steering, only when hot.
The brake pads: when brake pads are worn out they start making a squealing noise, in this case the noise is only when you brake or continuous. When you jack up the car the wheel may be a little stiff, but not necessarily.When brake pads are completely gone you also hear a scratching noise when braking. Inspect your brakes immediately.
Other suspension problems: Jack up the car as suggested above, check if the wheel has a slight play on the sides. Check all of the suspension components, suspension mounting points, and
steering linkage for damage. Also, check the frame rail for wrinkles. It is very important that these
components be in good condition, if you notice any problem here, go immediately to a mechanic.
Try doing the simple test above, reinstalling the wheel and working the tire back and forth. This
is a common test for bad ball joints and wheel bearings.
SOURCE: 2006 Chevy Trailblazer Tail Lights
There was a recall on this, take to the dealer and they will replace the whole socket on this.
SOURCE: tail lights and brake lights not working with headlights on
We had the same problem with ours, that is a Saturn recall items. Check with your Saturn dealer to see if it is still in effect. It use to make our headlight switch get hot. I think it was a poor ground in the taillight housing, I use to wiggle the bulb plug-ins and that helped for a while, but after the recall was fixed it never did it again.
SOURCE: 2001 VW Jetta rear running lights out. bulbs good, fuses good.
Almost sure it is a recall for a relay. Call the dealer, I had a 2001 VR6 with the same problem, and it was a simple, free recall.
SOURCE: Brake light, Turn signal not working rear right 06' Focus
I have a 2000 ford focus no brake lights. with the brake lights the transmission would not go into drive .replaced the brake light switch checked fuse replaced turn signal switch with no results then i moved onto the wiper switch and replaced it as much to my supp rise it fixed the problems
In the U.S. the type,
adjustments, and illumination factors of all automobile lighting devices
are regulated by the Federal Motor Vehicle Safety Standard 108. The
headlights must function and be adjusted correctly. Your high beams must
disperse their beams straight forward and low beams down and to the
right while safely providing illumination without too much or too little
glare. It is wise to check the headlight adjustment on your Mercedes at
least every year. Doing it yourself will save you time and money. It
will also make driving safer for you and others you may meet on the road
at night. All it takes is time, some basic tools and a little patience.
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