Power Windows GMC Suburban I

DESCRIPTION & OPERATION

A permanent magnet (PM) motor operates each power window. Each motor raises and lowers the glass when voltage is supplied to it. The direction the motor turns depends on polarity of the supply voltage. The switches control the supply voltage polarity.

The master door lock/power window switch assembly controls both motors. The right window switch controls only the right window motor. 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 automatically as it cools.

TROUBLE SHOOTING

EXCEPT LUMINA VAN, SILHOUETTE & TRANS SPORT

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, the battery should be fully charged and all connections and pins cleaned and tightened to ensure proper continuity and ground.

Power Window Switch Does Not Illuminate

1. Put headlight and panel dimmer switch in PARK position. Disconnect suspect window switch. Connect test light between Brown wire and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit in Brown wire.
2. Connect test light between Brown and Black wires. If test light does not illuminate, repair open circuit in Black wire. If test light illuminates, replace switch.

(Suburban & Crew Cab)

Turn ignition on. Connect test light between affected window switch connector Dark Blue wire and ground. If test light illuminates, replace defective window switch. If test light does not illuminate, repair open circuit in Dark Blue wire.

Turn ignition on. Disconnect left master window switch. Connect test light between Yellow wire and ground. If test light illuminates, replace master window switch. If test light does not illuminate, repair open circuit in Yellow wire.

1. Turn ignition on. Disconnect left master window switch. Connect test light between Yellow wire and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit in Yellow wire.
2. Connect test light between Yellow and Black wires. If test light does not illuminate, repair open circuit in Black wire. If test light illuminates, replace left master window switch.

Left Front Window Does Not Operate

1. Disconnect left front window motor. Turn ignition on. Move left front window switch to UP position. Connect test light between left front window motor Dark Blue wire and ground. If test light illuminates, go to next step. If test light does not illuminate, repair open circuit in Dark Blue wire. If circuit is okay, replace left window master switch.
2. Connect test light between left front window motor Dark Blue and Brown wires. If test light illuminates, replace left front window motor. If test light does not illuminate, repair open circuit in Brown wire. If circuit is okay, replace left window master switch.

Switch (Pickup & Utility)

1. Turn ignition on. Connect test light between right window switch connector Yellow wire and ground. If test light illuminates, go to next step. If test light does not illuminate, locate and repair open circuit in Yellow wire.
2. Move right window switch to UP position. Connect test light between right window switch connector Dark Blue wire and ground. If test light illuminates, go to next step. If test light does not illuminate, replace right window switch.
3. Move right window switch to DOWN position. Connect test light between right window switch connector Brown wire and ground. If test light illuminates, system is okay, If test light does not illuminate, replace right window switch.

(Pickup & Utility)

1. Turn ignition on. Position and hold right window switch in UP position. Connect test light between right window switch Dark Blue wire and ground. If test light illuminates, go to next step. If test light does not illuminate, go to step 3).
2. Connect test light between right window motor connector Dark Blue and Brown wires. If test light illuminates, replace right window motor. If test light does not illuminate, go to step 4). 3) Connect test light between left window switch connector Yellow wire and ground. If test light illuminates, go to next step. If test light does not illuminate, locate and repair open circuit in Yellow wire.
3. Connect test light between left window switch connector Yellow and Light Blue wires. If test light illuminates, go to step 6). If test light does not illuminate, go to next step.
4. Connect test light between left window switch connector Yellow and Black wires. If test light illuminates, replace left window switch. If test light does not illuminate, repair open circuit in Black wire.
5. Connect test light between left window switch connector Yellow and Tan wires. If test light illuminates, go to next step. If test light does not illuminate, replace left window switch.
6. Connect test light between right window switch connector Yellow wire and Light Blue wire, then between Yellow wire and Tan wire. If test light illuminates at both wires, replace left window switch. If test light illuminates at only one wire or not at all, locate and repair open circuits from right window switch connector to master switch connector.

REMOVAL & INSTALLATION

Note. Power window motor is not serviced. It is replaced as an assembly with window regulator.

Removal & Installation (Window Motor & Regulator)

1. Disconnect negative battery cable. Remove plug on each of trim panel pull strap (if equipped) and screws underneath. Remove trim panel pull strap. Remove door handle bezel. Remove armrest screws and armrest pad.
2. Insert Door Handle Clip Remover (J 9886-01) between handle and bearing plate. Align door handle clip remover parallel with door handle and push to disengage spring clip. Pull window regulator handle from door. Remove bearing plate.
3. Remove door trim panel by using Trim Pad Retainer Clip Remover (J 24595-C). Remove window switch bezel. See WINDOW SWITCH. Disconnect electrical connectors. Remove water dam by pulling it back from door assembly. Disconnect door lock linkage.
4. Lower window all way down. Remove screws holding door inner panel to door. Disconnect lock and handle rods from back of door inner panel. Tape lock and handle rods to door. Disconnect electrical connectors (if not previously done) and push wiring into door. Move window run channel away from glass. Tilt door inner panel and window glass assembly, and lift door inner panel and glass out of bottom of door.
5. Slide window glass channel from regulator roller assembly and remove window glass. Remove regulator assembly rivets. Remove regulator and motor as an assembly. To install, reverse removal procedure.

Removal & Installation (Window Switch)

Disconnect negative battery cable. Squeeze ends of switch bezel housing while pulling switch bezel housing away from door trim panel. Gently pry locking tabs of switch terminal block away from switch. Carefully remove terminal block. To install, reverse removal procedure.

Power Window Wiring Diagram (2 Door). Scheme 1

Power Window Wiring Diagram (4 Door). Scheme 2