POWER WINDOW SYSTEM
The power window system allows each of the front door windows to be raised and lowered electrically by actuating a switch on the trim panel of each respective door. Additionally, the master switch on the driver side door trim panel allows the driver to raise or lower the passenger side front door window. The power window system receives battery feed through a circuit breaker in the junction block, only when the ignition switch is in the ON position.
The power window system includes the power window switches on each front door trim panel, the circuit breaker in the junction block, and the power window motors inside each front door. This group covers diagnosis and service of only the electrical components in the power window system.
POWER WINDOW SWITCH
The power windows are controlled by two-way momentary switches mounted in the mirror flag bezel on the trim panel of the front door. A second power window switch on the driver side bezel allows the driver to control the passenger side window. The power windows will only operate when the ignition switch is in the ON position. The power window switches control the battery and ground feeds to the power window motors. The passenger side power window switch receives a ground feed through the driver side power window motor. The power window switches cannot be repaired, if faulty or damaged, they must be replaced.
POWER WINDOW MOTOR
A permanent magnet reversible motor moves the window regulator through an integral gearbox mechanism. A positive and negative battery connection to the two motor terminals will cause the motor to rotate in one direction. Reversing the current through these same two connections will cause the motor to rotate in the opposite direction. In addition, each power motor is equipped with an integral self-resetting circuit breaker to protect the motor from overloads.
The power window motor and gearbox assembly on this model are mounted to the outside of the front door module. This arrangement provides for easy access to the power window motor for service, without removing the window regulator or glass from the door. The power window motor and gearbox assembly cannot be repaired, if faulty or damaged, the entire power window motor assembly must be replaced.
CIRCUIT BREAKER
An automatic resetting circuit breaker in the junction block is used to protect the power window system circuit. The circuit breaker can protect the system from a short circuit, or from an overload condition caused by an obstructed or struck window glass or regulator. The circuit breaker cannot be repaired, if faulty, it must be replaced.
ALL WINDOWS INOPERATIVE
- Test the circuit breaker in the junction block. See «CIRCUIT BREAKER»(ref-150816-S15101320922002112100000) . If OK, go to next step. If not OK, replace faulty circuit breaker.
- Disconnect and isolate the battery negative cable. Remove power window lock switch and mirror flag bezel unit from the driver side front door trim panel. Unplug the wire harness connector from the power window switch unit.
- Check for continuity between the ground circuit cavity of the proper window switch wire harness connector and a good ground. If OK, see «POWER WINDOW SWITCH»(ref-150816-S04297440502002112100000) . If not OK, repair the circuit to ground as required.
ONE WINDOW INOPERATIVE
The window glass must be free to slide up and down for the proper window motor to function properly. If the glass is not free to move up and down, the motor will overload and trip the integral circuit breaker. To determine if the glass is free, disconnect the regulator plate from the glass. Then slide the window up and down by hand. There is an alternate method to check if the glass is free.
Position the glass between the up and down stops. Then, shake the glass in the door. Check that the glass can be moves slightly from side to side, front to rear, and up and down. Then, check that the glass is not bound tight in the tracks. If the glass is free, proceed with the diagnosis that follows.
- Disconnect and isolate the battery negative cable. Remove the power window and lock switch and mirror flag bezel unit from the door trim panel on the side of the vehicle with the inoperative window. Unplug the wire harness connector from the power window switch unit.
- Connect the battery negative cable. Turn the ignition switch to the ON position. Check for battery voltage switch to the ON position. Check for battery voltage at the fused ignition switch output (run) circuit cavity of the power window switch wire harness connector. See «WIRING DIAGRAMS»(ref-150816-S34306045472002112100000) . If OK, and the inoperative power window is on the driver side, go to Step 4 . If not OK, and the inoperative power window in on the passenger side, go to next step. If not OK, repair the open circuit to the junction block as required.
- Disconnect and isolate the battery negative cable. Check for continuity between each of the two master window switch right up/down control circuit cavities in the passenger side power window switch wire harness connector and a good ground. See «WIRING DIAGRAMS»(ref-150816-S34306045472002112100000) . In each case, there should be continuity. If OK, go to next step. If not OK, repair the open circuit to the driver side power window switch as required.
- Test the power window switch continuity. See «POWER WINDOW SWITCH»(ref-150816-S04297440502002112100000) . If OK, go to next step. If not OK, replace faulty power window switch unit.
- Check the continuity in each circuit between the inoperative power window switch wire harness connector cavities and the corresponding power window motor wire harness connector cavities. If OK, see «POWER WINDOW MOTOR»(ref-150816-S40512319082002112100000) . If not OK, repair the open circuit(s) as required.
- Locate the circuit breaker in the junction block. Pull out the circuit breaker slightly, but be certain that the circuit breaker terminals still contact the terminals in the junction block cavities.
- Connect the negative lead of a 12-volt DC voltmeter to a good ground.
- With the voltmeter positive lead, check both terminals of the circuit breaker for battery voltage. If only one terminal has battery voltage, the circuit breaker is faulty and must be replaced. If neither terminal has battery voltage, repair the open circuit from the Power Distribution center (PDC) as required. If the circuit breaker checks OK, but no power windows operate, see «POWER WINDOW SWITCH»(ref-150816-S04297440502002112100000) .
Note. Before you proceed with this diagnosis, confirm proper circuit breaker operation. See CIRCUIT BREAKER .
- Remove the power window switch from the mirror flag bezel. See «POWER WINDOW SWITCH»(ref-150816-S13787714692002112100000) under REMOVAL & INSTALLATION. Carefully separate the wire harness connector from the switch body.
- Check the switch continuity in each position as shown. (Scheme 6)- (Scheme 7), and «POWER WINDOW SWITCH CONTINUITY CHART - DRIVER SIDE»(ref-150816-S18227485992002112100000) and «POWER WINDOW SWITCH CONTINUITY CHART - PASSENGER SIDE»(ref-150816-S31419555672002112100000) tables.
- If switch is OK, see «POWER WINDOW MOTOR»(ref-150816-S40512319082002112100000). If not OK, replace the faulty power window switch. See «POWER WINDOW SWITCH»(ref-150816-S13787714692002112100000) under REMOVAL & INSTALLATION.
| Switch Position | Continuity Between | |
|---|---|---|
| OFF | PINS 1 & 2, PINS 2 & 3, PINS 3 & 4, PINS 4 & 6 | |
| UP | ||
| Left | PINS 1 & 5, PINS 2 & 3, PINS 3 & 4, PINS 4 & 6 | |
| Right | PINS 1 & 2, PINS 2 & 4, PINS 3 & 5, PINS 4 & 6 | |
| DOWN | ||
| Left | PINS 1 & 2, PINS 2 & 3, PINS 3 & 4, PINS 5 & 6 | |
| Right | PINS 1 & 2, PINS 2 & 3, PINS 3 & 6, PINS 4 & 5 | |
POWER WINDOW SWITCH CONTINUITY CHART - DRIVER SIDE
| Switch Position | Continuity Between |
|---|---|
| OFF | PINS 1 & 4, PINS 2 & 3 |
| UP | PINS 1 & 4, PINS 3 & 5 |
| UP | PINS 1 & 4, PINS 3 & 5 |
| DOWN | PINS 2 & 3, PINS 1 & 5 |
POWER WINDOW SWITCH CONTINUITY CHART - PASSENGER SIDE
Scheme 6
Scheme 7
Note. Before proceeding with this diagnosis, confirm proper power window switch operation. See POWER WINDOW SWITCH .
- Disconnect and isolate the battery negative cable. Remove the trim panel from the door with the inoperative power window.
- Unplug the power window motor wire harness connector. Apply 12 volts across the motor terminals to check its operation in one direction. Reverse the connections across the motor terminals to check the operation in the other direction. If the window is in the full up or full down position, the motor will not operate in that direction by design. If OK, repair the circuit from the power window motor to the power window switch as required. If not OK, replace the faulty power window motor.
- If the motor operates in both directions, check the operation of the window glass and lift mechanism through its complete up and down travel. There should be no binding or sticking of the window glass or lift mechanism through the entire travel range. If not OK, repair the window glass, tracks, and regulator for sticking, binding or improper adjustment.