GM Service Manual Online
For 1990-2009 cars only

Power Window System Controls

The power window system will operate anytime the Retained Accessory Power (RAP) system is active or when the ignition switch is in the ACCY or ON position.

The LF power window master switch can control the up and down functions of all the windows in the vehicle. The passenger door power window switches can only control the up and down functions of the individual window. The power window master switch also contains a lockout switch. The lockout switch controls the power window master switch lockout signal circuit. When the lockout switch is in the OFF position, the power window master switch lockout signal circuit is complete and the passenger door power window switches function normally. When the lockout switch is in the ON position, the power window master switch lockout signal circuit is interrupted and the passenger door window switches cannot control the up and down functions of the power windows.

Power Window Motor Operation

A permanent magnet motor operates each of the power side windows. Each motor raises or lowers the glass when the motor receives voltage. The direction the motor turns depends on the polarity of the supply voltage. The power window switches control the polarity of the supply voltage.