![]() You may also notice that the wiper switch is not working either. The turn signal switch is part of the combination switch found in the steering column and is mounted right behind the steering wheel. ![]() In most cases, these turn signal problems are due to a faulty turn signal switch. You can manually hold the turn signal switch pressed to keep the turn signal flashing. The turn signal switch doesn’t engage to keep the left or right turn signal on. When you press the switch to turn left (or right), none of the turn signals on one side work. Turn signals on one side (left or right) of the car are not working.2- Left or Right Turn signals not working Mercedes (left or right) turn signal constantly ONĪ defective SAM module can cause one of the turn signals to stay on all the time while the rest operate properly. It is not common for both of these SAM units to fail simultaneously. Right front SAM (N10/7) powers right front lights.Left front SAM (N10/6) powers left front lights.Mercedes-Benz cars have two or more SAM units. Read codes with the YOUCANIC full system scanner if you are a Mercedes owner trying to troubleshoot the problem yourself. Here is a good article on how to perform this test on a Mercedes-Benz.ĭiagnose the SAM module and replace it if necessary. If you don’t get any power, check the continuity between the turn signal and the SAM module. You should get between 11 and 14 volts if you don’t get any power check continuity between the turn signal and the SAM module. Measure the voltage at the turn signal socket.Turn the turn signal switch or hazard lights on.Set the digital multimeter to DC voltage current.You need to use a digital multimeter to test for power at the headlight/taillight.If you keep having the problem of the turn signal socket melting, try adding a ground from the tail light to the frame.Ĭheck for power at the turn signal assembly. If the turn signal fails within a few weeks, replace the socket or the turn signal assembly if necessary. If this is your problem, try using sandpaper to clean the socket and try reinstalling it. The socket contact points heat up to the point where they start to melt. We have seen cases where the turn signal stopped working due to inadequate electrical contact between the turn signal bulb socket and the headlamp housing. Clean it electrical contact cleaner if necessary. Remove the electrical plug from the turn signal unit that is not working and inspect it. The electrical plug that plugs into the headlight or taillight assembly may be loose or not making good contact. Replace the light bulb with a new bulb that has the recommended wattage and bulb type. burned turn signal contact may heat up and melt the plastic which covers the contact points.a bad headlight/taillight electrical plug/connector/harness.It could be one of the turn signals located in the front, rear, or side mirror housing.Īny of the following may cause Mercedes turn signal not working problems: ![]() 1 – Left or Right Mercedes Turn signal not working The switch can get stuck and prohibit the turn signals from operating properly. Press the hazard warning switch on and off several times. You can swap the turn signal replay with another relay in the identical fuse box. Look in the owner’s manual to find the location of the fuse panels for your Mercedes.Ģ. Check the turn signal fuses in your fuse panel under the dash and engine compartment.
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