Ways to Troubleshoot Your Toyota Pickup Window Regulator
One of the most common inconveniences that car owners have is not being able to roll their windows up or down. If this is happening to you, then there might be a problem with your Toyota Pickup window regulator. However, just because it is not working doesn't already mean you need to replace it. Most of the cases of regulator failure can actually be caused by another component. If you want to know what they are, try these tips:
Test the wiring harness
Sometimes, the window regulator's failure is caused by a fault in the intervening wiring. To gain access to its connections, pry the switch panel up with your fingers and probe the connectors. If you can't do that, you might have to remove the panel itself first. The panels at the door are held on with a variety of fasteners. Study them first and know which tools to use before taking them out one by one. This way, you can still reuse these hardware pieces when you put back the door panel.
Examine the switches
The easiest way to do this is to access the motor harness plug and check its functionality with a 12-volt test light. Before doing this, however, unplug the motor and probe the one of the wiring harnesses. Then, operate the window regulator's switch with the key on and check if the test light turns on when the switch is activated. Note that the wires should show power when the switch is pushed to roll the window up and when pushed again to roll it down. If no power is supplied in either or both direction, then the fuse might be blown or defective.
Investigate the motor
If the fuse is good and all of the wiring connections are plugged in, it might be time to examine the window motor. A technical way of doing this is to check for the proper voltage at the power window plug while the switch is depressed. You will need an ohm meter for this one. However, if you don't have access to this tool, simply access the motor and tap it with a hammer. Do this to the motor while holding the switch in the direction you want the window to move. If the window rolls, then there's something wrong with the motor. Sometimes, the window regulator's motor develops a "dead spot" that can be activated by the tap of a hammer. However, note that tapping it is not a fix; you will have to replace the faulty component.