![]() Clear the BAS/ETS/ESP and other instrument cluster warnings. The steering angle sensor must be reset by turning the steering wheel to full left and full right with the engine running. As the windows and the sunroof reach fully open / fully closed positions, hold the switch down or up for 5 seconds. To synchronize, follow these steps: Open and close the sliding roof and power windows. The vehicle must be resynchronized or otherwise normalized after performing this test or anytime you disconnect and reconnect the battery. ![]() You may want that fuse removed until you replace the defective parts causing battery drain. Next, you must even troubleshoot or replace the seat control module. For example, it may be the fuse for the seat control module. Then look up the fuse chart to find out which electrical system the fuse protects. Once the reading drops below 0.5 amperes, you know that the circuit protected by that fuse is drawing too much current. Continue removing and reinstalling all the fuses one at a time until you pull one that makes the multimeter reading drop to below 0.5 A. If the multimeter reading is still high, reinstall the fuse and go to the next fuse. As you remove each fuse, you should check the amperage reading on the multimeter. The reading should ideally be under 0.05 ampere. If your read is over this value, we need further troubleshooting. You should see a current draw of less than 0.1 Ampere or 100 milliamps. Connect one test lead to the battery post and the other to the negative battery cable. Turn on your ammeter and set it to reader currents on the A setting. Remove the negative battery terminal to connect the multimeter in series, as shown in the next step. Locate the battery in the trunk or the engine compartment. In some models, you may need to wait up to 30 minutes for all the electronic systems to go “to sleep.” This will allow the car to shut off any electronic consumers that stay on for a brief period after the vehicle is parked. Remove the key from the ignition and let the car sit for at least 15 minutes. Remove any accessories you may have plugged into the auxiliary outlets. For example, see this list of AGM Group 94 batteries for Mercedes-Benz on Amazon. You can save on the cost of the battery by purchasing it online. If your battery is over six years old, you should consider replacing it to avoid further electrical nightmares. Make sure you have a fully charged battery. How to troubleshoot Mercedes-Benz battery drain Step 1 If you have a fuse box in the trunk, open the trunk but place the latch in the locked position.Use a screwdriver to lock the door latch. Find a way to secure the switch pushed in. If you will keep any of the doors open, manually press the door switch. ![]()
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