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The wiper motor and transmission are located at the left side of the car under the air inlet cover at the bottom of the windshield. Did you check the fuses?
the wiper motor could be the problem. could also be the mechanism
needs a lube or replacing. also, lift the wiper arms off the glass so they stand up then switch on wipers. if goes right , the motor is being overloaded. if still slow, the motor needs replacing.
To check the fuse is always a good start. But also ,with the engine not running and the Key in the on position, turn the wipers on and listen for the wiper moter. You may hear the wiper motor running but the wipers not working ,they could have come disconnected at the motor or in the linkage. Physically move the wipers, if they move freely with no resistants, that would indicate a disconnection in the linkage or at the motor, in my opinion.
If both the wiper motor and the washer motor do not work, then it is the 25 amp fuse, or the wiper control module in the dash...possibly the switch in the steering column, but I doubt that...
there are usually two hot wires going to the wiper motor .. also a ground strap that may be bad ... one of the hot wires is always on if the key is on ... that for homing the wiper blades when you turn them off .. the other power input is from the wiper control circuit .. its only on if the wiper switch is turned on .. if you have power on the homing input then that wont do anything unless the wipers are not in home position .. if you have power to the "run" wire of the motor and the ground is good then the motor should run unless its defective .. you can put a jumper cable from the ground of the wiper motor to the engine block or battery neg, to check if the ground wire is causing the trouble .. that happens frequently in some models but not sure about your E250 ...
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