Apr 062017
 

Jeep Grand Cherokee LaredoWindow Regulators: will front & rear interchange from same side of vehicle?


NO. We simply compare the part numbers of each window regulator and see they are different.

Left Rear 741-374  compared to the Left Front: 741-556

Right Rear 741-375 compared to the Right Front: 741-557

Clearly the part numbers are different and should not be used in place of each other.

Window Operation

The power window system includes the Driver Door Module (DDM) and Passenger Door Module (PDM), which are mounted in their respective front door, the rear door power window switches mounted on the rear doors, and the power window motors mounted to the window regulator in each door. The DDM houses four master power window switches, the power window lockout switch and the control logic for the driver side front and rear door power windows. The PDM houses the passenger side front door power window switch and the control logic for the passenger side front and rear door power windows.

When a master power window switch on the DDM is used to operate a passenger side power window, the DDM sends the window positioning messages to the PDM over the Programmable Communications Interface (PCI) data bus. The PDM responds to these messages by sending control outputs to move the passenger side power window motors. In addition, when the power window lockout switch in the DDM is actuated to disable power window operation, this is accomplished through a lockout message sent to the PDM over the PCI data bus.

Body Control Module (BCM)

The Body Control Module (BCM) also supports and controls certain features of the power window system. The BCM receives a hard wired input from the ignition switch. The programming in the BCM allows it to process the information from this input and send ignition switch status messages to the DDM and the PDM over the PCI data bus. The DDM and PDM use this information and hard wired inputs from the front door ajar switches to control the lighting of the power window switch lamps, and to control the operation of the power window after ignition-off feature.

See the owner’s manual in the vehicle glove box for more information on the features, use and operation of the power window system.

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