Power Window Diagnosis and Methodology

Power Window Switch

Power Windows problems are usually caused by oxidation in the joints as do many electrical connects but shorting to ground is also common. A basic understanding of the circuitry is important and the best approach is using a test pen to pin point by back probing the connectors with the ign on , the ground pins and the live pins.
Test pen can be used to test ground or live as follows:

The test pen connected one end to a good ground and the other end to test live pin.
Similarly the test pen connected one end to a +ve battery terminal and the other end to test ground.
More often, it is the ground wire which gives problems and in the above test, after identifying the grounds, connect the ground wire from the connector downstream to a proper ground. If this does not work the switch could be a problem and a small blop of solder at the contacts inside the switch will solve the problem. Continuity test using multi-meter and a circuit diag of the power switch or one drawn from the test as shown on the diagram above should give a pretty good idea in locating the faulty contact/s.