🔧 ILX - Rear Window Regulator Replacement

The rear window regulator is the mechanism that lifts and lowers the rear door glass. Replacing it means removing the rear door trim panel, securing the glass, swapping the regulator (and motor if it comes as an assembly), then testing and reassembling.

Difficulty Level: Intermediate | Estimated Time: 1.5-3.0 hours (one door)

Assumption: your ILX uses a regulator/motor assembly (common).

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⚠️ Safety & Precautions

• ⚠️ Disconnect the negative battery cable before door work to reduce airbag/short risk.
• ⚠️ Support the window glass with tape so it cannot drop and shatter.
• ⚠️ Keep fingers clear of the regulator arms and tracks while testing.
• ⚠️ Don’t tear the vapor barrier (plastic sheet); it prevents water leaks.

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🔧 Required Tools

You'll need the following tools for this repair:

• Safety glasses
• Mechanic gloves
• Floor jack (rated 2-ton minimum)
• Jack stands (rated 2-ton minimum)
• 10mm socket
• Ratchet
• 3-inch extension
• Phillips #2 screwdriver
• Trim/panel clip removal tool
• Small flat trim pick
• Torque wrench (5–30 Nm range)
• Painters tape (1–2 inch wide)
• Plastic razor blade
• Shop light

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Rear window regulator assembly - Qty: 1
• Rear window regulator motor - Qty: 1 (only if not included)
• Door panel clip set - Qty: 1 (as needed)
• Butyl tape (vapor barrier adhesive) - Qty: 1 (as needed)

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📋 Before You Begin

• Park on level ground, shift to Park, and set the parking brake.
• Lower the rear window to about halfway if it still moves (this gives best access to the glass clamps).
• Use a 10mm socket to disconnect the negative battery cable, then wait at least 3 minutes.
• Have painters tape ready to hold the glass to the door frame.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Remove the rear door trim pieces

• Use a small flat trim pick to gently pop the small cover behind the inside door handle (it hides a screw).
• Use a Phillips #2 screwdriver to remove the screw behind the handle cover.
• Use the small flat trim pick to lift the window switch bezel, then unplug the switch connector.

Step 2: Remove the rear door panel

• Use a trim/panel clip removal tool to pop the door panel clips around the edges.
• Lift the door panel straight up to unhook it from the top ledge by the window.
• Unplug any remaining connectors (courtesy light/speaker if equipped).
• Clip tool = forked tool that pops plastic fasteners.

Step 3: Peel back the vapor barrier (plastic sheet)

• Use a plastic razor blade to separate the butyl adhesive without tearing the sheet.
• Peel it back only as much as needed to access the regulator and glass clamps.

Step 4: Secure the glass so it can’t fall

• Carefully raise the glass by hand to the fully up position.
• Use painters tape (1–2 inch wide) to tape the glass to the door frame (2–3 long strips).
• Use multiple strips; glass is heavier than it looks.

Step 5: Disconnect the window motor and loosen the glass clamps

• Unplug the window motor connector.
• Through the access holes, use a 10mm socket with ratchet to loosen (do not remove) the glass clamp bolts.
• Slide the glass upward slightly and confirm it’s fully supported by tape.
• Torque on reassembly: Torque to 9 Nm (7 ft-lbs) for glass clamp bolts.

Step 6: Remove the regulator assembly

• Use a 10mm socket, ratchet, and 3-inch extension to remove the regulator/motor mounting bolts.
• Carefully maneuver the regulator out through the largest access opening in the door.
• Torque on reassembly: Torque to 9 Nm (7 ft-lbs) for regulator mounting bolts.

Step 7: Install the new regulator

• Feed the new regulator into the door in the same orientation as the old one.
• Start all mounting bolts by hand first, then tighten with a 10mm socket.
• Finish tightening with a torque wrench (5–30 Nm range): Torque to 9 Nm (7 ft-lbs).

Step 8: Attach the glass to the new regulator

• Lower the glass carefully until it sits in the regulator clamps (keep tape in place until clamped).
• Use a 10mm socket to tighten the glass clamp bolts evenly.
• Use a torque wrench: Torque to 9 Nm (7 ft-lbs).

Step 9: Test the window before reassembly

• Plug the motor connector back in.
• Reconnect the negative battery cable using a 10mm socket.
• Turn ignition ON and run the window up/down slowly while watching the tracks.
• If it binds or tilts, stop and re-check glass seating in the clamps.
• Turn ignition OFF and disconnect the negative battery cable again before closing the door up.

Step 10: Reinstall vapor barrier and door panel

• Press the vapor barrier back into the butyl; add butyl tape where it no longer sticks.
• Reconnect all electrical connectors.
• Hang the door panel on the top ledge first, then press clips in by hand around the edges.
• Reinstall the screw(s) with a Phillips #2 screwdriver, then snap trim covers back in.

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✅ After Repair

• Reconnect the negative battery cable with a 10mm socket.
• Cycle the repaired rear window fully down and fully up 3–5 times to confirm smooth travel.
• Check that the door opens/closes normally and the panel is fully clipped (no rattles).
• If the window has one-touch behavior and it acts odd, repeat full down/full up cycles slowly.

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💰 DIY vs Shop Cost

Shop Cost: $350-$700 (parts + labor)

DIY Cost: $90-$250 (parts only)

You Save: $260-$450 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 1.5-2.5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.