Description & Operation

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 -- CHRYSLER CORP. for 1991-93 models, or COMPUTER RELEARN PROCEDURES -- CHRYSLER CORP. for 1994 models, article in GENERAL INFORMATION.

All Cherokee vehicles with power windows, have a cable driven window regulator system. 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 the ignition switch in the RUN position, voltage from the 60-amp fuse in the Power Distribution Center (PDC) is applied through the power window circuit breaker. Power then goes to the master switch terminal BY and to the passenger's window switches.

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

Terminal DV.
Driver's side front window motor.
Terminal CV.
The DOWN contact of the drivers side front window 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 passengers 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.