Power Window System Cadillac DeVille Concours

Description

Power window system uses a permanent magnet motor to operate each window. Motor operation is controlled by a master switch assembly alone or in combination with individual window switches. Window is raised or lowered depending on polarity of current applied to window motor.

Some models use a control module to access an express mode of operation. When left front window switch is held in down position for .3 second, module activates relay to apply full battery voltage to window motor. This provides current to quickly and fully open window.

Operation

When ignition switch is in RUN position, power for window system is supplied to master switch assembly through fuse block circuit breaker. When any master switch is operated, power is applied through related window switch to motor, driving window motor in either direction to either raise or lower window. Each motor is protected by an internal circuit breaker which will reset after switch is released (voltage removed).

SYSTEM CHECK

1. Before beginning system check, turn ignition on. Ensure there is battery voltage from power window circuit breaker, located in fuse block. Ensure master switch ground circuit is complete.
2. With all windows closed, turn ignition switch to RUN position. Briefly (less than .3 second) press left front window switch down. Window should descend a small distance, then stop.
3. Press left front window switch down and release (more than .3 second). Window should descend completely (express mode).
4. Press left front window switch up. Window should raise as long as switch is held up, then stop when switch is released (no express). Repeat step 3). While window is moving down in express mode, press switch upward. Window should stop express decent.
5. Lower and raise other windows from master switch. All windows should operate quietly and smoothly through full range of travel.
6. Lower and raise each window from window switches. All windows should operate quietly and smoothly through full range of travel. Note any symptoms and proceed to appropriate test.

TESTING

Note. Left front window switch is referred to as master switch. For circuit identification, see WIRING DIAGRAMS .

WINDOWS DO NOT OPERATE

1. Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at master switch connector. If test light is on, go to next step. If test light is off, check for poor connection at master switch. If connection is okay, repair open in Brown wire between power window 30-amp circuit breaker and master switch.
2. Backprobe between Brown wire and Black wire terminals (ground) of master switch connector. If test light is on, check for poor connection at master switch. If connection is okay, replace master switch. If test light is off, check for poor connection at ground connection. If connection is okay, repair open in Black wire between master switch and ground connection.

LEFT FRONT WINDOW DOES NOT OPERATE

1. Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at master switch connector. If test light is on, go to next step. If test light is off, repair open in Brown wire between master switch and power window 30-amp circuit breaker.
2. On all models, backprobe between Dark Blue wire and Brown wire terminals of master switch connector. While observing test light, press left window switch at master switch to up and down positions. If test light is on, go to next step. If test light is off, check for poor connection at master switch. If connection is okay, replace master switch.
3. Backprobe between Dark Blue wire and Brown wire terminals at left front window motor connector. While observing test light, press left front window switch at master switch to up and down positions. If test light is off, check for open in Dark Blue wire or Brown wire between master switch and left front window motor. Repair if necessary. If test light is on, check for poor connection at left front window motor. If connection is okay, replace left front window motor.

MASTER SWITCH INOPERATIVE, INDIVIDUAL SWITCHES ARE OKAY

1. Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at master switch connector. If test light is on, go to next step. If test light is off, repair open in Brown wire between master switch and power window 30-amp circuit breaker.
2. Backprobe between Tan wire and Light Blue wire terminals at master switch connector. Press right front window switch at master switch to up and down position. If test light is on, problem is intermittent. Check for poor connections. Repair as necessary. If test light is off, check for poor connection at master switch connector. Repair as necessary. If connection is okay, replace master switch.

RIGHT FRONT, LEFT REAR OR RIGHT REAR WINDOW IS INOPERATIVE AT

INDIVIDUAL SWITCH, OPERATES AT MASTER SWITCH

1. Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at right front window switch connector, or between ground and Dark Blue wire terminal or Brown wire terminal (Seville) at inoperative rear window switch connector.
2. If test light is on, go to next step. If test light is off, repair open in Brown wire between right front window switch and power window 30-amp circuit breaker. Repair open or short to ground in Dark Blue wire or Brown wire between master switch and rear window switch. If wires are okay, replace master switch.
3. Backprobe between Dark Blue wire and Brown wire terminals at inoperative window switch connector. While observing test light, press inoperative window switch to up and down positions. If test light is on, problem is intermittent. Check for poor connections. Repair as necessary. If test light is off, check for poor connection at inoperative switch. Repair as necessary. If connection is okay, replace inoperative window switch.

MASTER SWITCH, OPERATES AT INDIVIDUAL SWITCH

Turn ignition switch to RUN position. Using a test light, backprobe between ground and Brown wire terminal at master switch connector. If test light is off, repair open in Brown wire between master switch and power window 30-amp circuit breaker. If test light is on, check for poor connection at master switch. If connection is okay, replace master switch.

ONE WINDOW (EXCEPT LEFT FRONT) INOPERATIVE FROM MASTER &

INDIVIDUAL SWITCH, ALL OTHERS OPERATE

1. Turn ignition switch to RUN position. Using a test light, backprobe between Dark Blue wire and Brown wire terminals at inoperative window motor connector. While observing test light, press inoperative window switch to up and down positions. If test light is off, go to next step. If test light is on, check for poor connection at inoperative window motor. If connection is okay, replace inoperative window motor.
2. Backprobe between Dark Blue wire and Brown wire terminals, then between Brown wire and Tan wire terminals at right front window switch connector.
3. On all models except Seville, backprobe between Dark Green wire and Dark Blue wire terminals, then between Purple wire and Dark Blue wire terminals at rear window switch connector. On Seville, backprobe between Light Green wire and Brown wire terminals, then between Purple wire and Brown wire terminals at rear window switch connector.
4. On all models, if test light is on at all specified wire terminals, go to next step. If test light is off at any wire terminal, check for poor connection at inoperative window switch. If connection is okay, repair open in appropriate wire(s) to inoperative window switch. If wire(s) are okay, replace master switch.
5. Backprobe between Dark Blue wire and Brown wire terminals at inoperative window switch connector. While observing test light, press window switch to up and down position. If test light is on, check for poor connection at inoperative window motor, or repair open in Dark Blue wire or Brown wire between inoperative window switch and motor. If test light is off, check for poor connection at inoperative window switch. If connection is okay, replace inoperative window switch.

Removal

1. Raise window to full up position and secure in place. Remove door panel covering and insulator. Window may be disengaged from regulator and removed from vehicle. If motor is held to door and regulator with nuts and bolts, remove nuts and bolts as necessary.
2. If motor is held to door and regulator with rivets, punch out center of regulator-to-door rivets and drill out rivets using a 1/4" drill bit. Disconnect window from regulator.
3. Move regulator and motor assembly rearward to access motor-to-regulator rivets. Punch out center of motor-to-regulator rivets and drill out rivets using a 3/16" drill bit. On all models, disconnect electrical connector and remove motor from door.

Installation

To install, reverse removal procedure. On models attached with rivets, use Rivet Installer (J-34940) with 3/16" rivets for motor-to-regulator attachment and 1/4" rivets for regulator-to-door attachment.

Removal & Installation

Using a thin-blade screwdriver, pry between switch and door panel for spring clip (if equipped). Press down on clip to release switch and pry outward. Disconnect electrical connector and remove switch. To install, reverse removal procedure.

See also:
• WIRING DIAGRAMS