2007-2012 Lexus LS460 & LS600h Seat Guide: Fixing Lumbar Clicks and Track Failures
This guide covers the common failure points of the power seat system in the 2007-2012 Lexus LS460 and 2008-2012 Lexus LS600h, with a focus on the well-known lumbar support gear issue.
- The most common failure is not the main track, but stripped plastic gears in the lumbar support, causing a clicking noise.
- Replacement metal gear kits are available and are a cost-effective DIY repair for the lumbar issue.
- Some vehicles have an optional Pre-Crash Safety System which uses a different seat belt retractor; you must match this option when buying a used seat.
- Complete failure of all seat motors is likely a simple electrical issue like a fuse or the main connector under the seat.
Symptoms of a Failing Seat Track or Motor
When a component in the power seat assembly begins to fail, it can present in several ways. Understanding the specific symptom can help you pinpoint the cause.
1. Clicking or Grinding Noise from Lumbar Area
This is the most common issue for the 2007-2012 Lexus LS460 and 2008-2012 Lexus LS600h. You may hear a distinct clicking or grinding sound from within the seat back when trying to adjust the lumbar support, but the support itself doesn't move. This is almost always caused by broken plastic gears inside the lumbar adjustment motor. The motor is trying to work, but the stripped gears just click past each other.
2. A Single Seat Function Fails
If the seat will not move forward/backward, up/down, or recline, but other functions work, the problem is likely isolated. It could be a failed motor for that specific function, a faulty switch, or a wiring issue leading to that motor. For example, if the seat reclines but won't slide forward, the main track motor or its circuit is the likely culprit.
3. The Entire Power Seat is Dead
If no power functions on the seat work at all, the issue is likely electrical and common to the whole seat. The first things to check are the fuse for the power seats and the main electrical connector under the seat, which can sometimes become loose or disconnected.
4. Seat Memory Malfunctions
Sometimes the seat memory system may stop working or behave erratically, indicated by a beeping sound when trying to adjust the seat. This can occasionally be fixed by performing a system reset. A common reset procedure involves moving the seat fully forward and the seat back fully forward until a beep is heard, then setting the memory again.
Known Issues: The Lumbar Support Gear Failure
The single most prevalent problem with these seats is the failure of the lumbar support mechanism. Inside the actuator that moves the lumbar pad, Lexus used plastic planetary gears. Over time, these plastic gears become brittle and the teeth break off, especially from the stress of adjustments. When this happens, the motor spins, but the stripped gears can no longer move the lumbar support, resulting in the characteristic clicking sound.
Fortunately, the manufacturer of the mechanism (Leggett & Platt, formerly Shukra) has been known to provide owners with a free replacement gear kit containing durable metal gears. Repairing this issue involves removing the seat back panel, taking out the lumbar actuator, drilling out the rivets holding its case together, and replacing the internal plastic gears with the new metal ones. This is a common and well-documented repair on owner forums like ClubLexus.
Compatibility Warning: These vehicles may have been equipped with an optional Pre-Crash Safety (PCS) System. This system uses a forward-facing radar and camera to detect potential collisions and can automatically tighten the front seat belts. Vehicles with this option use a different seat belt retractor assembly, which is attached to the seat. When buying a used seat or track, you must verify if your vehicle and the donor vehicle have this system to ensure compatibility.
Buying a Used Seat Track
A used OEM seat track is an excellent value compared to a brand-new assembly from a Lexus dealer. However, there are key things to check to ensure you get a good part.
- Verify Compatibility: Confirm the part is from a 2007-2012 LS460 or 2008-2012 LS600h. Most importantly, check if your car has the Pre-Crash Safety System and ensure the donor seat matches. The easiest way to spot PCS is by looking for a twin-lens stereo camera at the top of the windshield.
- Test All Functions: If possible, have the seller demonstrate that all motors work — forward/back, up/down, tilt, and recline. Listen for any grinding or unusual noises.
- Inspect Wiring: Check the main wiring harness and connectors under the seat. Look for any cut wires, cracked insulation, or corrosion on the connector pins. A damaged harness can be difficult to repair.
- Check the Lumbar: Even if you're buying the whole track, ask about the lumbar support. If the seller notes a clicking sound, you'll know the lumbar gears need to be replaced. This isn't a deal-breaker, as the gear kit is often available, but it's good to know.
- Physical Inspection: Look for any signs of rust, bending, or cracks in the metal frame, which could indicate the part came from a vehicle in a serious accident.
Cost Comparison
| Part/Service | Estimated Cost |
|---|---|
| New OEM Seat Track (Full Assembly) | $1000+ (part only, estimated) |
| Used OEM Seat Track (Full Assembly) | $200 - $400 |
| Lumbar Gear Replacement Kit | Often free from manufacturer, or under $50 for aftermarket kits |
| Shop Labor (Track Replacement) | $250 - $500 |
| Shop Labor (Lumbar Gear Repair) | $150 - $300 |
Replacement Overview
Replacing components of the seat ranges in difficulty. Always disconnect the battery before unplugging any seat connectors to avoid airbag system faults.
- Lumbar Gear Repair (Difficulty: 2/5): This repair can be done without removing the seat from the vehicle. It involves removing the rear seat cover (held by screws and clips), unbolting the actuator (typically two 10mm bolts), disassembling it on a bench, and replacing the gears. Estimated time is 1-2 hours.
- Full Seat Track Replacement (Difficulty: 3/5): This requires removing the entire seat. First, remove the plastic covers over the bolt tracks. Slide the seat to access and remove the four 14mm bolts holding the track to the floor. Tilt the seat to disconnect the main electrical plug and the seatbelt anchor bolt. The seat is heavy and awkward, so having a helper is recommended. Estimated time is 2-3 hours.
Frequently Asked Questions
Why is my Lexus seat clicking but not moving?
If the clicking is coming from the seat back when you try to adjust lumbar support, it's almost certainly due to stripped plastic gears inside the lumbar motor assembly. If the clicking comes from under the seat when trying to move it forward or back, it could be a stripped gear in the main track drive motor or an obstruction in the track.
Can I just replace the broken lumbar gears?
Yes. This is the recommended and most cost-effective repair. The manufacturer of the lumbar mechanism has been known to send out replacement metal gear kits to owners who contact them. This is a much better solution than replacing the entire seat or seat track assembly for this specific problem.
How do I know if my LS460 or LS600h has the Pre-Crash Safety System?
The most reliable visual cue is the presence of a twin-lens infrared stereo camera mounted on the top edge of the windscreen, inside the car. Your vehicle may also have a PCS on/off button on the dashboard. When in doubt, a Lexus dealer can run your VIN to confirm the vehicle's original options.
My seat memory stopped working. What's the first thing to check?
Before assuming a part has failed, try resetting the system. A procedure mentioned by owners involves using the power controls to move the seat cushion and seat back to their full forward limits until you hear a beep. After the reset, try to save a new memory position. If this doesn't work, the issue could be with the control module or switch pack.
Helpful Videos
Technical Specifications
Seat track mounting bolts are 14mm.
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The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.
- Lexus LS460:
- Lexus LS600h:
- 🎬 Helpful Videos
- 🛍️ Shop This Part
- Symptoms of a Failing Seat Track or Motor
- 1. Clicking or Grinding Noise from Lumbar Area
- 2. A Single Seat Function Fails
- 3. The Entire Power Seat is Dead
- 4. Seat Memory Malfunctions
- Known Issues: The Lumbar Support Gear Failure
- Buying a Used Seat Track
- Cost Comparison
- Replacement Overview
- Frequently Asked Questions
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