GM Service Manual Online
For 1990-2009 cars only

A permanent magnet operates both of the power window regulator motors. Each motor raises or lowers the window when the motor receives voltage. The direction of the motion depends upon the motor terminal that receives the voltage. All of the motor circuits are grounded through the power side window switches. When a motor is operated, a set of switch contacts in the power side window switch breaks a normally-closed ground connection. The set of switch contacts makes a voltage connection. Current flows through the switch contacts, through the motor, and through the other normally-closed contact to ground. The window operates in the selected direction.

The left front door power side window switch operates the left and right front door power window regulator motors. The right front door power side window switch operates the right front door power window regulator motor only.

Each power window regulator motor has an internal circuit breaker. The internal circuit breaker opens when the regulator motor draws excessive current. Mechanical binding in the window drive may cause excessive current draw. The local circuit breaker will reset automatically after the cooling of the thermal overload device.