If the rear brake lights don’t work, unplug them and check for corrosion. Do they work properly? Does the third brake light work? It is not common for a short to develop in the brake light circuit and cause such problems. In most cases, the BAS/ASR light comes on as soon as you go over five mph.Ĭheck the rear brake lights. Typically this happens when one of the ABS sensors is defective. Pay close attention at the moment your BAS/ASR lights come on.ĭo the BAS/ASR lights come on as soon as you start driving but not when you press the brake pedal? Let’s say you don’t have such a scanner or can’t invest in one yet.
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Note that you need a full system scanner, and an OBD-II scanner can only diagnose the check engine light and will not read/erase codes related to ABS/BAS/ASR. The best way to diagnose an ABS sensor would be to use a diagnostic scanner such as the YOUCANIC full system scanner. How do you know that the ABS sensors are defective? They are installed on two (diagonal) or all four-wheel knuckles and measure wheel revolutions. If you replaced the brake light switch and are still having problems with the BAS/ASR lights, the next thing to check would be the ABS wheel speed sensors. Watch the following video on changing the brake light switch on a Mercedes-Benz. Replacing the brake light switch is easy. Since the brake light switch is relatively cheap ( check prices on Amazon) and often the main problem is it is better to replace it. It is not worth repairing the original brake light switch. If the ASR/BAS lights come on when you push the brake pedal, the brake light switch is most likely the problem. To check if the brake light switch is the problem, pay close attention when the BAS/ASR lights come on.ĭo ASR/BAS lights come on when you press the brake pedal? The switch doesn’t only turn on the brake lights on the rear, but other systems, including ABS, ASR, and BAS, use the input from the switch. The brake light switch is probably one of the main causes that trigger BAS/ASR light problems. If you need a reasonably priced Mercedes battery, read this article: Top 5 Batteries for Mercedes-Benz. Don’t wait until your Mercedes battery is completely dead. If your battery is over ten years old, consider replacing it even if the car has been starting fine. Your Mercedes-Benz battery should have its manufactured date stamped on top or the side. It takes a while for a discharged battery to charge fully. It is common for BAS / ASR lights to come on with a dead battery. An old battery can cause BAS/ASR lights to stay on. Mercedes-Benz cars are very sensitive to low voltage. Find out more about our advertising opportunities.Step 1: Ensure that the main battery on your Mercedes-Benz is holding a proper charge. Advertise Advertising on is well-targeted, has unique benefits, and is highly successful. Looking for something lighter? Read our funny complaints to see people who found humor in a bad situation. Vehicle Problems Find out what cars to avoid, view the latest problem trends, or keep up-to-date with the most recently reported problems. Contact us with any comments or concerns.
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