Dorman 748-550 Power Window Regulator and Motor Assembly Instruction Manual

Introduction

This manual provides essential information for the installation, operation, and maintenance of your Dorman 748-550 Rear Driver Side Power Window Regulator and Motor Assembly. This unit is precision-engineered and extensively tested to ensure an exact fit, function, and performance matching the original window regulator on compatible Jeep Grand Cherokee models from 2005 to 2010.

Please read these instructions thoroughly before beginning any installation or operation to ensure proper function and safety.

Product Overview

The Dorman 748-550 Power Window Regulator and Motor Assembly is designed for reliable performance and ease of installation. Key features include:

• Trustworthy Replacement: Engineered and tested to match the fit, function, and performance of the original window regulator on specified vehicles.
• Quality Assured: Extensively tested by cycling thousands of times in an actual vehicle door to ensure a long, trouble-free service life.
• Reliable Design: Engineered in North America and backed by a long history of automotive aftermarket experience.

Figure 1: Main view of the Dorman 748-550 Power Window Regulator and Motor Assembly.

What's in the Box

Your package should contain the following:

• One (1) Dorman 748-550 Power Window Regulator and Motor Assembly.

Note: Additional fasteners or tools required for installation are not included and must be sourced separately.

Setup and Installation

The Dorman 748-550 is reverse-engineered to match the original equipment shape and dimensions, providing a direct and seamless fit. For proper installation, it is recommended to consult your vehicle's service manual for specific door panel removal and reinstallation procedures.

1. Ensure the vehicle's battery is disconnected before beginning installation to prevent electrical hazards.
2. Carefully remove the interior door panel and any other components obstructing access to the existing window regulator.
3. Disconnect the electrical connector from the old motor and unbolt the old regulator assembly from the door frame.
4. Remove the old window regulator and motor assembly.
5. Install the new Dorman 748-550 assembly, aligning it with the factory mounting points. Secure with appropriate fasteners.
6. Connect the electrical connector to the new motor.
7. Reconnect the vehicle's battery and test the window operation before reassembling the door panel.
8. Reinstall the door panel and all other removed components.

To confirm fitment for your exact vehicle, input your make, model, and trim level into the garage tool provided by the retailer or manufacturer.

Figure 2: Side view of the Dorman 748-550, highlighting the electrical connector for proper installation.

Figure 3: Close-up of the electrical connector, ensuring correct wiring during installation.

Operating Instructions

Once installed, the power window regulator operates via the vehicle's standard window lift switch. Ensure the vehicle's ignition is on or in accessory mode to provide power to the window system.

• Press and hold the window switch down to lower the window.
• Pull and hold the window switch up to raise the window.
• Release the switch at any point to stop the window's movement.

Note: Some vehicles may feature an "auto up/down" function, allowing a single press or pull to fully open or close the window. Refer to your vehicle's owner's manual for specific features.

Maintenance

The Dorman 748-550 Power Window Regulator and Motor Assembly is designed for long-term, maintenance-free operation. However, to ensure optimal performance and longevity of your vehicle's window system:

• Keep window tracks clean and free of debris. Dirt and grime can impede window movement and put strain on the motor.
• Periodically inspect the window seals and weatherstripping for wear or damage. Proper sealing helps protect the internal components from moisture and dust.
• Avoid forcing the window if it encounters an obstruction. This can damage the regulator mechanism or motor.

Troubleshooting

If you experience issues with your power window, consider the following common troubleshooting steps. Dorman products are designed to avoid common pitfalls found in lesser quality alternatives, as demonstrated in the video below.

• Window Not Moving:
  • Check the vehicle's fuse box for a blown fuse related to the power windows.
  • Ensure the window lock-out switch (if present) is not engaged.
  • Verify the electrical connection to the motor is secure.
• Slow or Jerky Window Movement:
  • Inspect window tracks for dirt or obstructions. Clean if necessary.
  • Lubricate window tracks with a silicone-based lubricant if movement is stiff.
  • This Dorman unit is designed to prevent slow or jerky movement often seen in competitor products due to superior cable sheathing and motor design.
• Grinding or Unusual Noises:
  • Unusual noises can indicate an issue with the regulator mechanism or motor. Dorman regulators are tested to operate smoothly and quietly.
  • If grinding persists, re-check installation for proper alignment and secure mounting.
• Interior Lights Remaining On / Battery Drain:
  • Dorman Smart Motor technology ensures proper programming to prevent issues like interior lights remaining on after door closure, which can lead to battery drain. If this occurs, verify the correct Dorman part was installed and consult a professional.
• Window Pinch Force Issues:
  • All Dorman Smart Motor window regulators are FMVSS compliant, ensuring safe pinch force levels. If you suspect an issue with pinch force, have the system inspected by a qualified technician immediately.

If these steps do not resolve the issue, it is recommended to seek assistance from a certified automotive technician.

Specifications

Warranty and Support

Dorman products are backed by a commitment to quality and innovation. For specific warranty information regarding your Dorman 748-550 Power Window Regulator and Motor Assembly, please refer to the documentation included with your purchase or visit the official Dorman website. Dorman also provides ASE Blue Seal Certified Technical Support to assist with any product-related inquiries or installation questions.

For further assistance, you may contact Dorman customer support directly or consult a professional automotive technician.