Power Window System Chevrolet Blazer S15

DESCRIPTION & OPERATION

A permanent-magnet motor operates each power window. Each motor raises and lowers window when voltage is supplied. Motor direction depends on polarity of supply voltage. Switches control supply voltage polarity.

Master door lock/power window switch assembly controls all motors. Individual window switches are located on each door panel. Each motor is protected by a built-in circuit breaker. If a window switch is held too long with window obstructed or after window is fully up or down, circuit breaker opens circuit. Circuit breaker resets automatically as it cools.

TROUBLE SHOOTING

Before proceeding to TESTING, perform the following visual inspections

1. Check POWER WINDOW CIRCUIT BREAKER for damage. Replace if damaged.
2. Check power window voltage supply fuse. If fuse is blown, service and repair source of overload. Replace fuse.

TESTING

Note. Before any testing is attempted, battery should be fully charged and all connections and pins cleaned and tightened to ensure proper continuity and ground.

Windows Do Not Operate

1. Turn ignition switch to RUN position. Connect test light between ground and Yellow wire at left window switch connector. If test light illuminates, go to next step. If test light does not illuminate, repair open in Yellow wire.
2. Connect test light between left window switch connector Yellow and Black wires. If test light illuminates, check window switch for poor connection. If connection is okay, replace left window switch. If test light does not illuminate, repair open in Black ground wire.

Left Window Inoperative/Right Window Operates Okay

1. Turn ignition switch to RUN position. Connect test light between left window switch connector Dark Blue and Brown wires. Observe test light and operate switch between UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, check left window switch for poor connection. If connection is okay, replace left window switch.
2. Connect test light between left window motor connector Dark Blue and Brown wires. Observe test light and operate switch between UP and DOWN positions. If test light illuminates in both positions, check left window motor connector for poor connection. If connection is okay, replace left window motor. If test light does not illuminate in both positions, repair open in Dark Blue or Brown wires between left window switch connector and left front window motor connector.

Switch/Operates Okay From Left Window Switch

1. Turn ignition switch to RUN position. Connect test light between ground and Yellow wire at right window switch connector. If test light illuminates, go to next step. If test light does not illuminate, repair open in Yellow wire.
2. Connect test light between right window switch connector Dark Blue and Brown wires. Operate window between UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, check window switch for poor connection. If connection is okay, replace right window switch.
3. Connect test light between right window motor connector Dark Blue and Brown wires. Operate window switch between UP and DOWN positions. If test light illuminates in both positions, check right window motor for poor connection. If connection is okay, replace right window motor. If test light does not illuminate in both positions, repair open in Dark Blue or Brown wires between right window switch and right window motor.

Window Operates Okay

1. Turn ignition switch to RUN position. Connect test light between right window motor connector Brown and Dark Blue wires. Operate window switch between UP and DOWN positions. If test light does not illuminate in both positions, go to next step. If test light illuminates in both positions, check right window motor for poor connection. If connection is okay, replace right window motor.
2. Connect test light between right window switch connector Light Blue and Tan wires. Operate right window switch (at left window switch) between UP and DOWN positions. If test light illuminates in both directions, go to next step. If test light does not illuminate in both directions, go to step 4).
3. Connect test light between right window switch connector Dark Blue and Brown wires. Operate right window switch between UP and DOWN positions. If test light illuminates in both positions, repair open in Dark Blue or Brown wires. If test light does not illuminate in both positions, check right window switch for poor connection. If connection is okay, replace right window switch.
4. Connect test light between left window switch connector Light Blue and Tan wires. Operate inoperative window switch at left window switch. If test light illuminates in both positions, repair open in Light Blue or Tan wires. If test light does not illuminate in both positions, replace left window switch.

All Windows Do Not Operate

1. Turn ignition switch to RUN position. Connect test light between ground and Yellow wire at left front window switch connector. If test light illuminates, go to next step. If test light does not illuminate, repair open in Yellow wire.
2. Connect test light between left front window switch connector Yellow and Black wires. If test light illuminates, check window switch for poor connection. If connection is okay, replace left front window switch. If test light does not illuminate, repair open in Black ground wire.

Left Front Window Inoperative/All Others Okay

1. Turn ignition switch to RUN position. Connect test light between left front window switch connector Dark Blue and Brown wires. Operate switch between UP and DOWN positions. If test light illuminates in both directions, go to next step. If test light does not illuminate in both directions, check left front window switch for poor connection. If connection is okay, replace left front window switch.
2. Connect test light between left front window motor Dark Blue and Brown wires. Observe test light and operate switch between UP and DOWN positions. If test light illuminates in both positions, check left front window motor connector for poor connection. If connection is okay, replace motor. If test light does not illuminate in both positions, repair open in Dark Blue or Brown wire.

Individual Window Switch, But Operates Okay From Left Front Sw.

1. Turn ignition switch to RUN position. Place window lock-out switch in OFF position. Connect test light between inoperative window switch connector Dark Blue wire (left rear and right rear), or Yellow wire (right front window switch) and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open in Dark Blue or Yellow wires as necessary.
2. Connect test light between inoperative window switch connector Dark Blue and Brown wires. Operate window between UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, check inoperative window switch for poor connection. If connection is okay, replace inoperative window switch.
3. Connect test light between inoperative window motor connector Dark Blue and Brown wires. Operate window between UP and DOWN positions. If test light illuminates in both positions, check inoperative window motor for poor connection. If connection is okay, replace inoperative window motor. If test light does not illuminate in both positions, repair open in Dark Blue or Brown wires between inoperative window switch and window motor.

Windows Operate Okay

1. Turn ignition switch to RUN position. Connect test light between inoperative window motor connector terminals "A" (Brown wire) and "B" (Dark Blue wire). Operate window switch between UP and DOWN positions. If test light does not illuminate in both positions, go to next step. If test light illuminates in both positions, check inoperative window motor for poor connection. If connection is okay, replace window motor.
2. Connect test light between inoperative window switch connector left rear and right rear terminals "A" (Dark Green wire) and "D" (Purple wire), or between window switch connector right front terminals "J" (Light Blue wire) and "L" (Tan wire). Operate inoperative window switch (at left front switch) between UP and DOWN positions. If test light illuminates in both positions, go to next step. If test light does not illuminate in both positions, go to step 4).
3. Connect test light between right front inoperative window switch connector terminals "G" (Dark Blue wire) and "K" (Brown wire), or between left rear and right rear terminals "F" (Brown wire) and "C" (Dark Blue wire). Operate inoperative window switch between UP and DOWN positions. If test light illuminates in both positions, repair open in Dark Blue or Brown wires. If test light does not illuminate in both positions, check inoperative window switch for poor connection. If connection is okay, replace inoperative window switch.
4. Connect test light between left front window switch connectors. For right front, connect test light between terminals "B" (Light Blue wire) and "D" (Tan wire). For left rear, connect test light between terminals "G" (Dark Green wire) and "K" (Purple wire). For right rear, connect test light between terminals "H" (Light Green wire) and "H" (Purple wire). If test light illuminates in all positions, repair poor connection or open in appropriate wiring. If test light does not illuminate in all positions, replace left front window switch.

Lock-out Function Does Not Work But Windows Operate Okay

Turn ignition switch to RUN position. Put window lock-out switch in OFF position. Using a test light, backprobe between lock-out switch connector terminal "B" (Dark Blue wire) and ground. If test light illuminates, replace lock-out switch. If test light does not illuminate, repair short to voltage in Dark Blue wire.

REMOVAL & INSTALLATION

1. Disconnect negative battery cable. Raise window to fully closed position. Secure glass to door frame using cloth-backed tape. Remove door garnish molding. Insert Door Handle Remover (J 9886-01) between handle and bearing plate.
2. Align door handle remover tool with door handle and push to disengage clip. Pull handle from door, and remove bearing plate. Remove armrest mounting screws and armrest. Remove power window switch. See «WINDOW SWITCH»(/chevrolet/blazer/s15-1994-1998/remont/windows/#power-window-system) .
3. Using Trim Panel Remover (J 38778) pry retainers from door frame, and remove door trim panel. Remove armrest bracket. Remove water deflector. Disconnect electrical connectors from motor. CAUTION: Sector gear must be locked into position. Regulator lift arm is under tension from counterbalance spring and could cause personal injury if sector gear is not locked in position.
4. Remove rivets securing regulator to door inner panel. Remove regulator roller from door sash. Remove regulator from door. Drill hole through regulator sector gear and backplate. Install bolt and nut, locking sector gear into position. Drill out window motor mounting rivets. Remove motor from window regulator.
5. To install, reverse removal procedure. Use 3/16" (4.8 mm) rivets to install motor and regulator.

Disconnect negative battery cable. Using flat-blade screwdriver, pry power window switch from door trim panel. Disconnect electrical connector and remove power window switch. To install, reverse removal procedure.

See also:
• COMPUTER RELEARN PROCEDURES
• WINDOW SWITCH