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How to Wire a Power Window Relay

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Published on Apr 24, 2012

How to Wire a Power Window Relay

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Power windows have been around for years. For this reason, power window vehicles are still up and running especially in places with low humidity where rust is not an issue. A power window system uses a DC motor to actuate the glass and open the door windows. The DC motor works in the nominal 2 to 5 Amp current range. For this reason, a relay has almost always been used to control the motor.

The basic motor operation is done by reversing the polarity of it's power and ground input. It is here where a properly connected window motor makes the whole arrangement worthwhile and stable. Although window motors come in various sizes, their nominal electric current range may go as high as 6 Amps, with peak voltages as much as 12 Amps if extreme resistance is found. Relays can deliver up to 40 Amps of power making them the best real world choice. Transistors have been used in the past and even on some new models, but they eventually falter and leave the driver to eat up the cost of replacement. This circuit connection is very useful due to the fact that many older vehicles can be re-wired using original or aftermarket parts, keeping the windows operational.

Here is how the window motor circuit works:

12 volt power is fed from the fuse to terminal 87 of the relay. This terminal then becomes the power input. Power is also fed to terminal 85 of the relay coil on both relays. Terminal 87A is connected directly to ground, so this terminal becomes the chassis ground input. Then, terminal 30 is wired directly to the window motor relay. Each relay feeds ......

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