This video is a real world diagnosis and repair of a Chev Suburban with windshield wipers that would not move at low speed or at intermittent speed. High speed was working fine. There are many videos showing how to replace the wiper control module, but very few that show how to prove the diagnosis before ordering new parts. This video puts emphasis on diagnostics.

You’ll notice that I used a few specialty tools including a Power Probe and a special clamp to remove the wiper arms. These are used because they make the job easier, but you do not need them. A multimeter set to DC voltage, with a jumper wire attached to ground would work just as well, and most wiper arms can be removed without need for special tools. You can use a pin to do backprobing, with a jumper wire and alligator clips to gain access to the back of the connector while it is still hooked up. This technique allows one to safely penetrate the wiring without causing significant damage to the wires or connector.

The wiring and control of most cars are similar, but details such as which wire to probe and whether the module is under network control will vary. So, if you are serious about fixing your own car, a good first step would be to get a wiring diagram and a copy of the dealers repair manual. Fortunately these are available online from third party sellers like Alldatadiy, Mitchelldiy, and others.

Auto repair is inherently dangerous, both with respect to the chance of damaging the car and the risk of personal injury. Only you can assess your skill set, tools available, and stomach for causing harm. Very few repair efforts go by with no complications, so you need to have a skill set that can cope with unexpected problems. Any misadventure you encounter if you decide to accept the risk of DIY auto repair is your responsibility.