The error codes will give you a good idea of the cause of BAS/ASR lights staying on. If you want to figure out the BAS/ASR problem on your own, you will need to get a hold of an advanced diagnostic scanner to do a complete system scan and read the fault codes.
#1998 MERCEDES KOMPRESSOR BATTERY FULL#
Or, if you are a DIYer, use the YOUCANIC full system scanner to run a diagnostic yourself. If you still have BAS/ASR light problems, it may be time to have an auto mechanic or a Mercedes-Benz dealer perform a diagnostic.
Check the brake light switch, car battery, and ABS wheel sensors. We hope one of this article’s tips will fix your BAS/ASR light problem. In a few cases, we have seen wires inside the headlight & tail light fried and causing shorts and malfunctions. You may want to use a digital multimeter to check continuity or to ensure there is no short. Check the connections that plug into the brake light assembly. Unplug the rear brake lights and check for corrosion if the rear brake lights don’t work. 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. The BAS/ASR light usually comes on when you exceed 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 when 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. You can click here for a comprehensive guide. 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. Step 1: Ensure that the main battery on your Mercedes-Benz is holding a proper charge.
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