🔧 Rear Window Regulator - Replacement

This repair replaces the rear door window regulator in your Highlander. The regulator is the lift mechanism inside the door that moves the rear glass up and down.

The rear left and rear right procedures are nearly the same. The most important part is safely taping the glass before the old regulator is removed.

Difficulty Level: Beginner-Intermediate | Estimated Time: 1.5-2.5 hours per door

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before unplugging rear door wiring.
• ⚠️ Support the window glass with tape before loosening the glass bolts. The glass can drop suddenly.
• ⚠️ Wear gloves because the inside of the door has sharp metal edges.
• ⚠️ Do not slam the rear door while the regulator is removed or the glass is taped.
• ⚠️ Keep fingers away from the regulator tracks while testing the window.

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🔧 Required Tools

You'll need the following tools for this repair:

• 10mm socket
• Ratchet handle
• 3-inch socket extension
• Phillips #2 screwdriver
• Small flat-blade screwdriver
• Plastic trim removal tool set
• Needle-nose pliers
• Painter’s tape 2-inch wide
• Torque wrench inch-pound range
• Work gloves
• Safety glasses

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear driver-side window regulator with motor - Qty: 1 if replacing left rear door
• Rear passenger-side window regulator with motor - Qty: 1 if replacing right rear door
• Rear door trim panel clips - Qty: 4-8 recommended
• Butyl sealant tape - Qty: 1 roll if the moisture barrier seal is damaged

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📋 Before You Begin

• Park your Highlander on level ground and set the parking brake.
• Open the affected rear door fully.
• If the rear window still moves, position the glass so the glass mounting bolts are visible through the inner door access holes.
• If the window does not move, the repair can still be done, but the glass must be lifted and supported by hand.
• Disconnect the negative battery cable using a 10mm socket. Wait 2 minutes before unplugging connectors.
• A plastic trim tool is a non-metal pry tool that helps remove panels without scratching trim.
• Butyl sealant is sticky black sealing tape used to reseal the plastic water shield inside the door.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the Rear Door Switch Panel

• Use a plastic trim removal tool to gently pry up the rear power window switch panel from the armrest area.
• Lift the panel just enough to reach the wiring connector underneath.
• Use your fingers or a small flat-blade screwdriver to press the connector lock tab.
• Unplug the connector and set the switch panel aside.
• Tip: Pry slowly to save the clips.

Step 2: Remove the Rear Door Trim Screws

• Use a small flat-blade screwdriver to open the small cover behind the inside door handle.
• Use a Phillips #2 screwdriver to remove the screw behind the inside door handle.
• Use a Phillips #2 screwdriver to remove the screw in the armrest or pull handle area.
• Place the screws somewhere safe so they are not lost.

Step 3: Remove the Rear Door Trim Panel

• Use a plastic trim removal tool at the lower edge of the panel to pop the trim clips loose.
• Work around the bottom and side edges until all clips release.
• Lift the trim panel straight upward to unhook it from the window ledge.
• Use your fingers to unplug any remaining electrical connectors.
• Use needle-nose pliers if needed to release the inside handle cable clips.
• Set the trim panel on a clean, soft surface.

Step 4: Peel Back the Moisture Barrier

• Use gloved hands to slowly peel the clear plastic moisture barrier away from the inner door shell.
• Keep the barrier intact. It prevents rainwater inside the door from reaching the cabin trim.
• Use a small flat-blade screwdriver only to help separate sticky butyl sealant if needed.
• Fold the barrier out of the way without stretching the wiring.

Step 5: Tape and Support the Rear Window Glass

• Use painter’s tape 2-inch wide to secure the glass to the top of the rear door frame.
• Run at least 3 long tape strips from the outside of the glass, over the top of the door frame, and onto the inside of the glass.
• If the glass is sitting low, wear work gloves and carefully lift the glass by hand before taping it.
• Make sure the glass cannot slide down before loosening the regulator bolts.
• Tip: More tape is safer here.

Step 6: Separate the Glass from the Regulator

• Look through the door access holes and find the glass mounting bolts or clamp bolts.
• Use a 10mm socket, 3-inch socket extension, and ratchet handle to loosen the glass mounting bolts.
• Do not let the glass drop. Keep it taped in the fully raised position.
• During reassembly, tighten the glass mounting bolts to Torque to 8 Nm (71 in-lbs).

Step 7: Unplug the Rear Window Motor

• Press the lock tab on the rear window motor connector by hand.
• If the connector is tight, use a small flat-blade screwdriver carefully to help release the tab.
• Pull the connector straight out. Do not pull on the wires.

Step 8: Remove the Old Rear Regulator

• Use a 10mm socket, 3-inch socket extension, and ratchet handle to remove the regulator mounting bolts.
• Hold the regulator with one hand while removing the last bolt.
• Guide the regulator and motor assembly out through the largest opening in the rear door.
• Turn the assembly gently as needed. Do not force it against the glass or wiring.

Step 9: Install the New Rear Regulator

• Compare the new regulator to the old one before installing it.
• Make sure the motor position, mounting holes, and glass attachment points match the side being repaired.
• Feed the new regulator into the rear door through the large access opening.
• Start all bolts by hand first to prevent crooked threads.
• Use a 10mm socket, 3-inch socket extension, and torque wrench inch-pound range to tighten the regulator mounting bolts to Torque to 8 Nm (71 in-lbs).

Step 10: Reattach the Glass

• Carefully loosen only enough painter’s tape 2-inch wide to lower the glass into the regulator clamps or bolt holes.
• Keep one hand supporting the glass while aligning it.
• Use a 10mm socket and torque wrench inch-pound range to tighten the glass mounting bolts to Torque to 8 Nm (71 in-lbs).
• Leave light tape support on the glass until the first test is complete.

Step 11: Test the Rear Window

• Plug the rear window motor connector in by hand until it clicks.
• Temporarily plug in the rear window switch connector by hand.
• Reconnect the negative battery cable using a 10mm socket.
• Turn the ignition on without starting the engine.
• Use the rear switch to move the window down and up slowly.
• Watch the glass. It should move smoothly without tilting, binding, or popping.
• If the glass binds, stop. Use a 10mm socket to loosen the glass bolts, realign the glass, and retighten to Torque to 8 Nm (71 in-lbs).

Step 12: Initialize the Rear Window Function

• Using the rear door switch, fully close the window.
• Hold the switch in the UP position for about 2 seconds after the glass reaches the top.
• Fully lower the window.
• Hold the switch in the DOWN position for about 2 seconds after the glass reaches the bottom.
• Raise the window again and confirm normal operation from the rear switch and driver master switch.

Step 13: Reinstall the Moisture Barrier

• Turn the ignition off.
• Disconnect the negative battery cable again using a 10mm socket before final reassembly.
• Press the plastic moisture barrier back onto the original butyl sealant by hand.
• If the old sealant no longer sticks, apply butyl sealant tape around the opening.
• Seal the lower edge carefully. This area is most likely to leak water into the cabin.

Step 14: Reinstall the Rear Door Trim Panel

• Reconnect the inside door handle cables by hand.
• Reconnect all electrical connectors by hand until they click.
• Hook the top of the door trim panel over the window ledge.
• Line up the trim clips with the holes in the door.
• Press around the edges of the panel with your hands until all clips snap in.
• Replace any broken clips with rear door trim panel clips.

Step 15: Reinstall Screws and Switch Panel

• Use a Phillips #2 screwdriver to reinstall the screw behind the inside door handle.
• Use a Phillips #2 screwdriver to reinstall the armrest or pull handle screw.
• Close the screw cover by hand.
• Plug in the rear switch panel connector by hand.
• Press the switch panel into place until it sits flush.
• Reconnect the negative battery cable using a 10mm socket.

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✅ After Repair

• ✅ Test the repaired rear window from the rear door switch.
• ✅ Test the repaired rear window from the driver master switch.
• ✅ Make sure the rear window lock button on the driver switch works correctly.
• ✅ Check that the glass seals evenly at the top.
• ✅ Verify the rear door lock, speaker, and inside handle work normally.
• ✅ Listen for scraping, popping, or cable noises during window movement.
• ✅ If water leaks appear later, remove the panel and reseal the moisture barrier with butyl sealant tape.

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💰 DIY vs Shop Cost

Shop Cost: $325-$600 per rear door regulator with motor

DIY Cost: $80-$225 per rear door regulator with motor

You Save: $245-$375 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.0-1.7 hours per rear door.

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