POWER WINDOW MOTOR
A permanent magnet reversible motor moves the
window regulator through an integral gearbox mech-
anism. 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 window motor is equipped
with an integral self-resetting circuit breaker to pro-
tect the motor from overloads. The power window
motor and gearbox assembly cannot be repaired and,
if faulty or damaged, the entire power window regu-
lator assembly must be replaced.
CIRCUIT BREAKER
An automatic resetting circuit breaker in the junc-
tion block is used to protect the power window sys-
tem circuit. The circuit breaker can protect the
system from a short circuit, or from an overload con-
dition caused by an obstructed or stuck window glass
or regulator.
The circuit breaker cannot be repaired and, if
faulty, it must be replaced.
DIAGNOSIS AND TESTING
POWER WINDOW SYSTEM
For circuit descriptions and diagrams, refer to 8W-60
- Power Windows in Group 8W - Wiring Diagrams.
ALL WINDOWS INOPERATIVE
(1) Check the circuit breaker in the junction block,
as described in this group. If OK, go to Step 2. If not
OK, replace the faulty circuit breaker.
(2) Disconnect and isolate the battery negative
cable. Remove the power window and lock master
switch unit from the driver side front door trim
panel. Unplug the wire harness connector from the
master switch unit.
(3) Check for continuity between the ground cir-
cuit cavity of the power window and lock master
switch unit wire harness connector and a good
ground. If OK, go to Step 4. If not OK, repair the cir-
cuit to ground as required.
(4) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run) cir-
cuit cavity of the power window and lock master
switch unit wire harness connector. If OK, see Power
Window Switch in the Diagnosis and Testing section
of this group. If not OK, repair the circuit to the
junction block as required.
ONE WINDOW INOPERATIVE
The window glass must be free to slide up and
down for the power window motor to function prop-
erly. 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 moved 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. If the
glass is not free, refer to Group 23 - Body for the
door window glass and hardware service and adjust-
ment procedures.
If the only inoperative window is in the driver side
front door and the preceding checks have not identi-
fied a problem, see Power Window Motor in the Diag-
nosis and Testing section of this group. If the
problem being diagnosed involves only the Auto-down
feature for the driver side front door window, but all
of the power windows are operational, replace the
faulty power window and lock master switch unit. If
the problem being diagnosed involves only an inoper-
ative power window switch Light-Emitting Diode
(LED), but the power window that the switch con-
trols operates satisfactorily from that switch, replace
the faulty switch unit. For any other single power
window problem proceed with diagnosis as follows:
(1) Disconnect and isolate the battery negative
cable. Unplug the wire harness connector from the
power window switch unit on the door with the inop-
erative power window. Check for continuity between
the ground circuit cavity of the power window switch
wire harness connector and a good ground. There
should be continuity. If OK, go to Step 2. If not OK,
repair the open circuit to the power window and door
lock master switch as required.
(2) Connect the battery negative cable. Turn the
ignition switch to the On position. Check for battery
voltage at the fused ignition switch output (run) cir-
cuit cavity in the body half of the power window
switch unit wire harness connector. If OK, go to Step
3. If not OK, repair the open circuit to the power
window and door lock master switch as required.
(3) Test the power window switch continuity. See
Power Window Switch in the Diagnosis and Testing
section of this group. If OK, go to Step 4. If not OK,
replace the faulty power window switch unit.
(4) Refer to the circuit diagrams in 8W-60 - Power
Windows in Group 8W - Wiring Diagrams. Check the
continuity in each circuit between the inoperative
power window switch wire harness connector cavities
and the corresponding power window motor wire har-
ness connector cavities. If OK, see Power Window
8S - 2 POWER WINDOW SYSTEMS DN
DESCRIPTION AND OPERATION (Continued)
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