Windows: Description and Operation

A Permanent Magnet (PM) Motor operates each of the power windows. Each motor raises or lowers the glass when voltage is supplied to it. The direction the motor turns depends on the polarity of the supply voltage. The window switches control the supply voltage polarity.

Each motor is protected by a built-in circuit breaker. If a window switch is held too long with the window obstructed or after the window is fully up or down, the circuit breaker opens the circuit. The circuit breaker resets only after voltage is removed from the motor.

LH Front Window Switch Operation
When the Ignition Switch is in "RUN," battery voltage is applied to the LH Front Window Switch through the POWER WINDOW CIRCUIT BREAKER C and CKT 143 (Chevrolet) or CKT 141 (Oldsmobile). When any of the up switches in the LH Front Window Switch are operated. battery voltage is applied to the Window Regulator Motor. The Window Regulator Motor is grounded through the down contact in the LH Front Window Switch. The motor runs to drive the window up. When any of the down switches in the LH Front Window Switch are operated battery voltage is applied to the Window Regulator Motor in the opposite direction. The Window Regulator Motor is grounded through the up contact in the LH Front Window Switch. The motor runs to drive the window down.

Express Down Feature
If the "DN" position in the LH Front Window Switch is momentarily pressed down past the first detent, the window will travel to the fully down position. To stop the window, press the LH Front Window Switch to the "UP" position.

Lockout Switch Operation (4 Door)
The LH Front Window Switch contains a Lockout Switch which will remove battery voltage from the other window switches. This will not allow the operation of the windows from their individual switches. The windows can still be operated as normal from the LH Front Window Switch.

Window Switch Operation
When the Ignition Switch is in "RUN," battery voltage is applied to the window switches through the POWER WINDOW CIRCUIT BREAKER C, CKT 143 (Chevrolet) (2 Door) or CKT 141 (Oldsmobile) (2 Door) and the LH Front Window Switch (CKT 1307) (4 Door) to the switches. When the "UP" position in the RH Front Window Switch is pressed, battery voltage is applied to the RH Front Window Regulator Motor through CKT 666 (DK BLU wire). The motor is grounded through CKT 667 (BRN wire), the down contact in the RH Front Window Switch, CKT 167 (TAN wire), and the down contact in the LH Front Window Switch. The motor runs to drive the window up. When the "DN" position in the RH Front Window Switch is pressed, battery voltage is applied to the RH Front Window Regulator Motor in the opposite direction through CKT 667 (BRN wire). The Motor is grounded through CKT 666 (DK BLU wire), the up contact in the RH Front Window Switch, CKT 166 (LT BLU wire), and the up contact in the LH Front Window Switch. The motor runs to drive the window down. The other windows operate similarly from their individual window switches.