How well the wipers work directly affects driving safety, especially when it's raining or snowing. When the blades suddenly stop moving or start jerking, the first thing to consider is whether the motor is alive. In this article, we'll tell you how to check the wiper motor yourself, what methods are available in an ordinary garage, and what to pay attention to during diagnostics.

Typical signs of failure

Before you start checking, it's useful to pay attention to the symptoms that usually indicate a wiper motor malfunction:

  • the wipers don't respond to any of the modes;
  • they work only at one speed;
  • they move jerkily or with a noticeable pause;
  • unusual sounds appear — crackling, grinding, humming;
  • the motor gets very hot or smells like burnt wiring.

If at least one of these signs is present, it's time to figure out how to check the wiper motor and make sure it's working properly.

What to prepare for diagnostics

To carry out the check yourself, you'll need very few tools:

  • a multimeter for measuring voltage and resistance;
  • a battery or any 12 V power source;
  • wires with alligator clips;
  • a set of screwdrivers and wrenches to remove the assembly.

Important point: before properly checking the wiper motor, be sure to disconnect the negative battery terminal. This will protect against accidental short circuits.

Checking voltage at the connector

The first step is to make sure that power is actually reaching the motor. Here's what to do:

  1. Turn on the ignition and activate the wipers.
  2. Use a multimeter to measure the voltage on the contacts of the connector that goes to the motor.
  3. If there is 12 V on the contacts but the motor is silent, the problem is likely in the mechanism itself.
  4. If there is no voltage, then the cause is in the wiring, fuses, or relay.

So already at this stage it becomes clear whether it's worth digging further into the electrical side or moving on to the next step.

Direct connection of the motor

You can check the wiper motor without special equipment by applying power directly from the battery:

  1. Remove the motor from the wiper mechanism.
  2. Connect wires from the battery to the motor terminals.
  3. If the motor is working, its shaft will rotate smoothly and without excessive noise.
  4. If there is no rotation or it's jerky, the assembly requires repair or replacement.

This method helps quickly understand whether the motor is functional. However, it won't reveal hidden defects — such as worn commutator brushes or a jamming gearbox.

Measuring winding resistance

A more precise approach is to measure resistance:

  1. Switch the multimeter to resistance measurement mode.
  2. Place the probes on the motor contacts.
  3. Compare the result with the data from the repair manual for the specific model.
  4. If the resistance is too high or, conversely, near zero, this indicates damage to the winding.

This method allows you to identify non-obvious electrical faults.

Inspecting the mechanics

Even if the electric motor itself works, it may not have enough power due to mechanical problems:

  • worn gearbox gears;
  • lack of lubrication or it's contaminated;
  • damaged rods or a jammed linkage.

Therefore, when figuring out how to properly check the wiper motor, don't forget about the mechanical part.

Summary

Now you know how to check your car's wiper motor yourself. The sequence of actions is as follows:

  1. Check the fuses and relay.
  2. Measure the voltage at the connector.
  3. Apply power directly from the battery.
  4. Measure the winding resistance.
  5. Inspect the gearbox and linkage.

This step-by-step approach helps accurately find the source of the malfunction and decide whether to repair the motor or install a new one. The main thing is not to rush and to follow safety precautions when working with automotive electrics.