DESCRIPTION
Window regulators are powered by a reversible electric motor located in each door. The motor is secured to the regulator on windows and connected by a drive cable on power vents. Each motor contains a circuit breaker and gear drive. Individual switches are used for all passenger windows.
The system uses a pair of single switches mounted on the console and no door switches. The motor cases are grounded.
A junction block located on left shroud connects body power accessories to chassis wiring. The power window wiring harness plugs into the accessory block. A 30 ampere circuit breaker mounted on fuse panel protects the motor wiring for the all power window systems.
OPERATION
When the window switch is depressed, current flows through the switch, actuates the motor in one direction, and is connects to ground through the motor case. Pressing the switch in the other direction provides power through the other feed wire, reversing the motor.
WINDOWS WILL NOT OPERATE
No power at circuit breaker or master switch. Ignition off. Bad ground connection at master switch. Switch defective.
INDIVIDUAL WINDOW DOES NOT OPERATE, ALL OTHERS OPERATE
Defective motor. Open circuit in door. Defective window switch or master switch.
INDIVIDUAL WINDOW DOES NOT OPERATE FROM
WINDOW SWITCH, OPERATES FROM MASTER SWITCH
Window switch defective.
CIRCUIT BREAKER
Check power feed to circuit breaker. Test power feed after circuit breaker. Repair as necessary.
MASTER CONTROL SWITCH
Check for power at Pink wire. All other wires should have continuity to ground when switch is in rest position. Check for clean and tight ground connection.
WINDOW CONTROL SWITCH
- Connect one lead of test lamp to Pink wire in switch connector, the other end to ground. If lamp does not light, check power feed wire. Locate wires to motor.
- Using a jumper wire, connect Pink wire in switch connector to one motor wire. Motor should operate. Reverse wires and retest. If motor operates properly, replace switch. If not, test motor.
WINDOW MOTOR
Connect power to one motor lead. Reverse connections and retest. If motor does not operate correctly in both directions, replace it.
REMOVAL & INSTALLATION
Note. Window motor can be removed from some models if window glass is intact and attached to regulator. In all other cases, window regulator and motor must be removed as an assembly, then separated when outside the door.
FRONT DOOR WINDOW REGULATOR AND MOTOR
| CAUTION | To prevent personal injury after removing regulator and motor assembly, lock sector gear to back plate before removing motor. Drill a l/8" hole through sector gear and back plate, no closer than l/2" from edge of sector gear. Install a metal screw (3/4" long) to lock gear, then remove motor. |
Removal & Installation (F Body)
- Remove door trim panel and water paper. Prop window 1/2 way up using rubber door stops between window and door panel. Remove rear guide and inner panel cam channels. Punch out center pins and drill out regulator rivets.
- Slide regulator rearward and disconnect motor wiring. Disengage roller on regulator roller on regulator lift arm from glass sash channel. Remove regulator through rear access hole. Drill a hole through the regulator sector gear and backplate.
- Install a bolt and nut to lock sector gear in position. Drill out motor attaching rivets and remove motor. To install, reverse removal procedure, using "U" bolts and nuts to secure regulator.
GM Power Window Wiring Diagram. Scheme 1
- Remove door trim panel. Working through access hole, remove clip attaching rod to lever. Release drive cable clip from bracket. Carefully press rubber motor studs out of door panel.
- Disconnect wiring and remove actuator. To install, reverse removal procedure. Soapy water should be applied to motor studs to ease insertion.