Power Windows GMC Cab & Chassis R3500

DESCRIPTION

Each power window is moved by a single permanent magnet motor. The direction in which motor turns depends on the polarity of the voltage applied. All power window motors have a self-resetting circuit breaker built into them.

On Blazer, Jimmy and Suburban the tailgate window is operated by an internal switch or a key. A cut-out switch prevents operation of the window by either switch when the tailgate is open. Circuit is protected by a 30-amp circuit breaker, located at fuse block.

PASSENGER SIDE WINDOW WILL NOT WORK

1. With ignition switch in "RUN" or "ACC" position, check for voltage at passenger side switch. If there is no voltage, find open between switch and fuse block. If okay, go to next step.
2. With voltage applied to Pink wire at the switch, move switch to the "UP" position. Dark Blue wire should also have voltage. If there is no voltage, replace switch. If okay, go to next step.
3. With power window switch in the "UP" position, check for voltage on Dark Blue wire at power window motor. If there is no voltage, find open between switch and motor.
4. If there is voltage on Dark Blue wire, connect a grounded jumper wire to Brown wire at the motor. If motor runs, find open in ground circuit. If motor does not run, replace power window motor.

PASSENGER SIDE WINDOW WILL NOT WORK WHEN USING PASSENGER SIDE SWITCH, WINDOW WORKS WITH MASTER SWITCH

With ignition switch in "RUN" or "ACC" position, check for voltage at Pink wire on passenger side switch. If there is no voltage, find open between switch and instrument panel harness connector. If voltage is present, replace switch.

PASSENGER SIDE WINDOW WILL NOT WORK WHEN USING MASTER SWITCH

1. With ignition in "RUN" or "ACC" position, check operation of driver's window. If driver's window works, master switch has voltage. Place master switch in "UP" position and check for voltage at Dark Blue wire.
2. If there is no voltage on Dark Blue wire, replace master switch. If voltage is present on Dark Blue wire, find open between master switch and passenger side switch.

DRIVER'S WINDOW WILL NOT WORK PASSENGER SIDE WINDOW WORKS

1. With ignition in "RUN" or "ACC" position, place master switch in "UP" position. Check for voltage at Dark Blue wire at master switch. If voltage is not present, replace master switch. If okay, go to next step.
2. With master switch in "UP" position, check for voltage on Dark Blue wire at power window motor. If there is no voltage, find open between switch and motor.
3. If there is voltage on Dark Blue wire, connect a grounded jumper wire to Brown wire at the motor. If motor runs, find open in ground circuit. If motor does not run, replace power window motor.

Removal ("S" Series)

1. Raise window to full "UP" position and tape glass to door frame to prevent it from falling. Disconnect negative battery cable. Remove door handle bezel, armrest, door trim panel, armrest bracket and water deflector. Disconnect regulator lift arm roller from window mount sash.
2. Drill hole through window regulator sector gear and backplate. Install a bolt and nut to lock sector gear in position. Using a 3/16" drill bit, drill out motor attaching rivets and remove motor.

Installation

Using Riveter (J-29022), fasten motor regulator with 3/16" rivets. To complete installation, reverse removal procedures.

Removal (Except "S" Series)

1. Raise window to full "UP" position and tape glass to door frame to prevent it from falling. Disconnect battery negative cable. Remove armrest, trim panel, armrest bracket, and water deflector.
2. Disconnect harness from power window motor. Using a 3/16" drill bit, drill out motor attaching rivets and remove motor. Push regulator forward and then slide it rearward to remove regulator arms from sash and rail. (Scheme 1)
3. Fold regulator arms and remove through access hole in door. Drill a hole through sector gear and backplate. Do not drill closer than 1/2" to edge of sector gear or backplate.
4. Install a 3/4" long sheet metal screw into hole to lock sector gear. Sector gear must be locked to avoid personal injury. Remove motor-to-regulator rivets and remove motor.

Lubricate motor drive gear and regulator sector teeth. Ensure that motor pinion gear teeth mesh properly with sector gear. Remove screw locking sector gear. To complete installation, reverse removal procedure.

Scheme 1

Removal & Installation ("C", "K" & "S" Series)

Disconnect battery negative cable. Remove door trim panel. Disconnect electrical lead from switch. Switch connector is secured with a retaining nut. Press in retaining tabs and remove power window switch. To install, reverse removal procedure.

Removal ("C", "K" & "G" Series)

1. Raise window to full "UP" position and tape glass to door frame to prevent it from falling. Disconnect battery negative cable. Remove door lock knob, armrest, assist handle, and strap assembly (if equipped with these items). Remove door trim panel.
2. Remove remote control bolts and set control assembly aside (if equipped). Remove window regulator-to-door panel attaching bolts and nuts. Disconnect harness from window regulator.
3. Disengage window regulator from rollers, regulator rail, or sash channels. Collapse regulator and remove it through access hole in door. Drill a hole through sector gear and backplate. Do not drill closer than 1/2" to edge of sector gear or backplate.
4. Install a 3/4" long sheet metal screw into hole to lock sector gear. Sector gear must be locked to avoid personal injury. Remove motor-to-regulator attaching screws and remove motor.

Lubricate motor drive gear and regulator sector teeth. Ensure that motor pinion gear teeth mesh properly with sector gear. Remove screw locking sector gear. To complete installation, reverse removal procedure.

Removal & Installation (Blazer & Jimmy)

Remove tailgate cover. Disconnect drive cable and wiring harness from motor. Remove motor attaching bolts and motor. (Scheme 2) To install, reverse removal procedure.

Removal & Installation (Suburban)

1. Remove tailgate trim panel (if equipped) and cover. Disconnect control rod from center handle. Remove center handle from tailgate. Disconnect right and left latch rods from control assembly. Remove control assembly from tailgate.
2. Lower window and remove outer glass seal by prying clips away from tailgate. Raise or lower window as necessary to gain access to sash channel bolts. Remove sash with glass from tailgate. Disconnect electrical lead from motor.
3. Remove regulator assembly from tailgate. Drill a 1/8" hole through sector gear and backplate. Install a 3/4" long sheet metal screw into hole to lock sector gear. Remove motor-to-regulator attaching screws and remove motor. To install, reverse removal procedure.

Scheme 2

Removal & Installation (Blazer, Jimmy & Suburban)

Remove tailgate trim panel (if equipped) and cover. Disconnect right latch rod from control assembly. Remove latch with cut-out switch from tailgate. Disconnect wiring harness and remove cut-out switch from latch. To install, reverse removal procedure.

WIRING DIAGRAMS

For wiring diagrams, refer to appropriate chassis wiring diagram in WIRING DIAGRAMS section.