Description & Operation

WARNING: Vehicles are equipped with air bag supplemental restraint system. Before attempting any repairs involving steering column, instrument panel or related components, see SERVICE PRECAUTIONS and DISABLING & ACTIVATING AIR BAG SYSTEM in AIR BAG RESTRAINT SYSTEM article.

CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Driveability problems may exist until computer systems have completed a relearn cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL INFORMATION.

A permanent magnet motor moves each power window. Each motor raises or lowers the glass when voltage is supplied to the motor. The direction the motor turns depends on the polarity of the supply voltage. The control switches control the supply voltage polarity.

With ignition in RUN, voltage from the 60-amp fuse No. 13 in the Power Distribution Center is applied to the 30-amp circuit breaker No. 26 in the fuse panel. Power then goes to the master switch terminal No. 5 and to the passenger's window switches.

When the driver's window switch is moved UP, the contacts close a current path to:

Terminal No. 4.
Driver's side front window motor.
Terminal No. 3.
Terminal No. 1 of the left front window switch to ground.

The motor then moves the glass up.

Current flows in a similar way when the UP contact in one of the passenger's window switches is closed. Current flow through the passenger's window motors must go through the driver's and the passenger's window switches before it reaches ground.

Each motor is protected by a built-in circuit breaker. If a window switch is held on 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. Do not allow frequent or consecutive resetting of the circuit breaker to continue.

NOTE: For information on fuses and circuit breakers, see FUSES & CIRCUIT BREAKERS article in ELECTRICAL.