• 2018

The Power Behind Power Windows

Window Motor Replacement

In the old days, anytime you wanted to roll down the window, you had to turn a crank, which meant that if you were driving alone and wanted to open the passenger window, or the back windows, you had to stop and pull over. Electric windows changed all that. A simple electrical motor and a switch on the door panel has made it possible.

The power windows are controlled by a window/lock switch on the trim panel of each door. Each switch controls the battery and ground feeds to each power window motor. The power window system then receives a battery feed through a fuse in the Totally Integrated Power Module (TIPM) to the door modules. There are two door modules: one for the driver door, the other for the passenger door. The system is only powered when the ignition switch is in the RUN or ACCESSORY position.

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.

Testing the Power Motor Window

If the power window motor is receiving proper current and ground, but does not operate, the problem might be with the motor. Testing the motor is pretty straightforward.

Note: The procedures outlined are specific to a 2012 DODGE RAM 1500 PICKUP; test procedures for window motors in other vehicles are similar, but reference the service manual for the vehicle being repaired for specific procedures.

  1. Remove the door trim panel to gain access to the power window motor wire connector
  2. Disconnect the window motor wire connector from the door harness
  3. Using two jumper wires, connect one to the battery (+) source and the other to ground (-)
  4. Connect the negative (-) jumper probe to one of the motor connector terminals
  5. Momentarily touch the positive (+) jumper probe to the other connector terminal. When the positive (+) probe is connected, the motor should rotate in one direction; if the window is all the way up or down, the motor will grunt and the inner door panel will flex when actuated in that one direction
  6. Reverse the jumper probes at the motor connector terminals. The window should now move in the opposite direction when the positive (+) probe touches the connector terminal; if the window does not move or grunt, replace the motor

If the window moved completely up or down, reverse the jumper probes and cycle the window to the opposite position to verify full operation. If the motor grunts, but does not move, verify that the regulator is not binding. There should be no binding or sticking of the window glass, or the lift mechanism, through the entire travel range.

Replacing the Power Window Motor

If the power window motor requires replacement, it must be replaced as an assembly with the window regulator. Replacing this assembly itself is not particularly difficult, but to access it, the door trim panel must be removed. That involves several steps. Let’s review that procedure.

Refer to Figure 1 for the removal/installation of the door trim panel.

  1. Disconnect and isolate the negative battery cable. If equipped with an Intelligent Battery Sensor (IBS), disconnect it first before removing the battery cable
  2. Using a trim stick (P/N C-4755), release the window switch/bezel from the door trim; disconnect the window switch electrical connectors
  3. Using the trim stick, remove the mirror flag (4)
  4. Remove the screw (2) and the interior handle bezel (3)
  5. Release the plastic push pins (1)
  6. Raise the trim panel (6) upward far enough to disengage the hooks on the back of the panel from the inner door panel and the door lock knob from the top of the panel

Refer to Figure 2. The motor/regulator (1) is mounted in place with three fasteners. Remove these fasteners, then remove the assembly from the carrier plate. Disconnect the electrical
connector (2). Connect the electrical connector (2) to connector on the new motor/regulator. Position the new motor/regulator in place. Secure it with the three fasteners. To finish the job,
re-install the door panel.

Re-installing the Door Panel

Refer to Figure 1 for the removal/installation of the door trim panel.

  1. Position the lower end of the trim panel (6) to the carrier plate on the inner door, aligning the hooks on the back of the panel to the slotted holes in the carrier
  2. Using a rotating arc motion, feed the lock knob through the hole at the upper rear corner of the panel; align and push down the panel to seat the hooks in the holes in the carrier plate
  3. Install the plastic push pins (1) around the perimeter of the panel and seat fully
  4. Install the interior handle bezel (3) and install the screw (2)
  5. Position the mirror flag (4) onto the door and seat the clips fully
  6. Connect the window switch electrical connectors and seat the window switch/bezel into the door trim fully
  7. Connect the IBS connector, if equipped; connect the negative battery cable

Magneti Marelli Offered by Mopar® offers window motors and regulators for most makes and models. All motors and regulators must pass six important tests before going to market including durability, temperature, impact, water entry, self-locking drive and noise level testing.

Visit www.moparrepairconnection.com for more information.

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