Power Windows Chevrolet Cab & Chassis C3500

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.

COMPONENT LOCATIONS

COMPONENT LOCATIONS

Scheme 1

Scheme 2

Scheme 3

Scheme 4

Scheme 5

Scheme 6

Scheme 7

Scheme 8

DOOR ADJUSTMENT

Note. This procedure can only be used when bolt-on service replacement hinges are installed.

Scheme 9

1. Loosen the body side pillar bolts to the door hinge. Adjust door up or down, forward or rearward, and in or out at the door hinges. Adjust gap between the rocker panel and the door to the specifications (Scheme 9)
2. Adjust gap between the door and the roof panel. Adjust gap between the rear of the door and the rear pillar. Adjust gap between the door and the fender. Note that door surface is flush with other panels to within 0.04"(1.0 mm). Tighten the hinge bolts to 26 ft. lbs. (35 N.m).
3. Adjust bolt to properly engage the door lock. Tighten bolt to 46 ft. lbs. (63 N.m). Install door striker bolt. (Scheme 10)

Scheme 10

SYSTEM TESTS

SYMPTOM INDEX

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 11)

Scheme 11

TEST B: POWER WINDOW LEFT DOSE NOT OPERATE OR ONLY GOES IN ONE DIRECTION - PICKUP

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 12)

Scheme 12

TEST C: POWER WINDOW RIGHT ONLY OPERATES FROM DRIVER'S SIDE WINDOW SWITCH - PICKUP

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 13)or (Scheme 14).

Scheme 13

Scheme 14

TEST D: POWER WINDOW RIGHT DOSE NOT OPERATE FROM EITHER SWITCH - PICKUP

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 15)

Scheme 15

TEST E: POWER WINDOW DO NOT OPERATE FROM DRIVER'S SIDE WINDOW SWITCH - SUBURBAN, CREW CAB & UTILITY

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 16)

Scheme 16

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 17)

Scheme 17

TEST G: POWER WINDOW SWITCH ILLUMINATION LAMP(S) DO NOT LIGHT

Check condition of GAGES fuse. If fuse is in good condition, use the following diagnostic procedures. (Scheme 18)

Scheme 18

Check condition of ACC/IGN circuit breaker. If circuit breaker is in good condition, use the following diagnostic procedures. (Scheme 19)

Scheme 19

REMOVAL & INSTALLATION

Scheme 20

Scheme 21

1. Remove door trim panel. See «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows). Lower the window all the way down.
2. Remove screws holding the module to the door. Pull back the water deflector. (Scheme 20)
3. Disconnect lock and handle rods from the back of the module. Tape them to the door.
4. Disconnect module wiring connector, if present. Pull the wiring from the door hinge pillar to reach the connector. Remove the boot over the wiring. Push the wiring harness into the door.
5. Remove upper belt through window run channel (Scheme 21) Move the channel away from the glass. Tilt the module and window glass assembly and lift it out of the bottom of the door.

Installation

1. Install module and glass assembly into the door. (Scheme 20) Fit the glass into the rear channel in the door.
2. Install upper run channel bolt and tighten it.
3. Connect lock and handle rods to the back of the module.
4. Connect wiring connector if present. Pull the wiring through the boot and connect it inside the door hinge pillar.
5. Install new water deflector. Refer to «WATER DEFLECTOR»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows__water-deflector).
6. Install top front and the top rear module screws.
7. Install module to door screws.
8. Install lower run channel bolt.
9. Install door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows).

Scheme 22

Scheme 23

1. Remove trim panel pull strap if present. Remove the plug on each side of the strap and the screws underneath.
2. Remove door handle bezel.
3. Remove armrest screws.
4. Remove armrest pad.
5. Use Trim Pad Retainer Clip Remover (J 24595-C) to remove the retainers from the inner door panel. (Scheme 22)or (Scheme 23).
6. Remove door trim pad.
7. Remove bezel with switches fit through cut-out in trim panel.

1. Connect retainers to the door trim panel if any remained in the door. Replace any broken retainers.
2. Install bezel with switches through cut-out in trim panel.
3. Put the trim pad in place on the door and push the retainers into the holes on the door.
4. Install window handle if used
5. Install armrest pad.
6. Install T armrest screws.
7. Connect door handle bezel.
8. Install pull strap, if present.

Scheme 24

WATER DEFLECTOR

Water deflectors are used to seal the door inner panel and prevent water from entering into the body. The deflector is secured with a self sealing adhesive. (Scheme 25)

Removal

Remove door trim panel. Refer to DOOR TRIM PANEL . Remove water deflector by pulling it back from the door module.

Install water deflector by pressing it against the door module in the area of the adhesive to make a continuous seal. Tuck the two lower tabs through slots in the door module. Tape over tabs and slots. Install door trim panel. Refer to DOOR TRIM PANEL .

Scheme 25

WINDOW GLASS

For window replacement (Scheme 21), (Scheme 26) and (Scheme 27).

1. Roll the window all the way down.
2. Remove door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows) .
3. Remove module panel. Refer to «DOOR MODULE»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows) .
4. Remove glass from the channel. Fold back the tab on the channel and slide the glass out

1. Install glass into the channel. Fold the tab on the channel up.
2. Install module and glass assembly into the bottom of the door. First fit the glass into the rear channel in the door. Fit the glass into the front run channel while pulling the channel toward the glass.
3. Install upper front run channel bolt.
4. Connect lock rods to module.
5. Connect boot over the wiring harness from the door to the body.
6. Connect wiring to the connector inside the door hinge pillar.
7. Install lower front run channel bolt.
8. Install lock rods to the module.
9. Install new water deflector. Refer to «WATER DEFLECTOR»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows__water-deflector) .
10. Install module to door screws, starting with the top front and top rear screws. Tighten the lower front run channel screw.
11. Install door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows) .

WINDOW REGULATOR

Note. The power window motor is not serviced. It is replaced as a unit with the regulator.

1. Disconnect negative battery cable.
2. Remove door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows).
3. Remove water deflector. Refer to «WATER DEFLECTOR»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows__water-deflector).
4. Disconnect door lock linkage.
5. Remove door module and glass. Refer to «DOOR MODULE»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows).
6. Remove window, bend the tab down on the window run channel to slide the door glass, from the regulator roller assembly. (Scheme 26)and (Scheme 27).
7. Remove regulator assembly rivets.
8. Remove regulator and motor as a unit.

1. Install regulator and motor assembly to the module panel.
2. Install window, bend the tab upward on the window run channel.
3. Install window and module to the door.
4. Connect lock rods to the retainer clips.
5. Install module panel screws, starting with the top front, and top rear screws.
6. Connect door lock linkage.
7. Install new water deflectors. Refer to «WATER DEFLECTOR»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows__water-deflector) .
8. Install door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows) .
9. Connect negative battery cable.

Scheme 26

Scheme 27

1. Roll up the window. Remove door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows). Remove window run channel bolts from door. Pull back water deflector. Disconnect run channel from the door. (Scheme 21)
2. Install window run channel to door. Install window run channel bolts to door. Reseal water deflector. Install door trim panel. Refer to «DOOR TRIM PANEL»(/chevrolet/cab-chassis-c3500/1989-2000/remont/windows/#power-windows).

WINDOW RUN CHANNEL WEATHERSTRIP

Roll down the window. Remove window run channel weatherstrip by pulling weatherstrip from front or rear channel runs. Install window run channel weatherstrip by sliding it between run channel and glass.

Scheme 28

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Scheme 35

Scheme 36

See also:
• 1994 COMPUTER RELEARN PROCEDURES
• A
• B
• C
• D
• E
• G
• WATER DEFLECTOR